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Lisgar Flooding Updates

This page is dedicated to providing regular updates on issues related to the flooding in the Lisgar community.

Update on Lining and Utility Trench

I received the following update from staff on the ongoing work in the Lisgar District.

Storm Sewer Lining (Phase 1)

Pipeflo Contracting completed the sewer lining works for the Phase 1 area on March 17. A piece of every liner that was installed was sent for testing and every liner has passed the testing requirements. The post-lining leakage testing is tentatively scheduled for April 24th.

Dewatering of the Utility Trench

Our consultant has provided draft engineering drawings for the utility trench dewatering system at Cactus Gate, for review and comment. Once these drawings are finalized, they will be used to develop a Request for Tender (RFT) later this year for the construction services and materials required to build the trench dewatering system.

Works Planned for 2017

The City has applied for funding under the Federal/Provincial Clean Water and Wastewater Fund (CWWF) program for 10 stormwater projects. Included in this list are two Lisgar Implementation projects: the Utility Trench Dewatering System at Cactus Gate and the Storm Sewer Lining (Phase 2) at Doug Leavens Boulevard and Osprey Boulevard (see figure). The Utility Trench Dewatering System was already scheduled for 2017 in the City’s Capital Plan, but the Storm Sewer Lining (Phase 2) has been moved forward from 2018 to this year to take advantage of the CWWF funding opportunity. We are anticipating issuing the RFT for the Phase 2 Storm Sewer Lining in May.

Posted April 17, 2017

Monitoring the FDCs - Questions for T&W staff

In early January 2017, as a result of significant rain and snow melt, I posed some questions to Commissioner Geoff Wright (of Transporation and Works) regarding ongoing monitoring of the storm water system in Lisgar. My questions are in bold, his responses follow:

Councillor McFadden:

As requested, staff have reviewed the questions from your office regarding the functioning of the Lisgar District FDC and provide the following information:

“Are staff still able to monitor the water levels of the FDCs through gauges that we put in place during the investigation?”

Yes, the monitoring installations from previous years have been maintained in place, including those in the FDC system (18 FDC monitoring gauges) in the Lisgar district.  The gauges record both water level and water temperature.

“Has there been any surcharging of the FDCs in the past 24 hours?”

The gauges are stand-alone units (i.e. the gauges do not have any type of telemetry or mobile connection) and therefore must be manually downloaded periodically by our consultant.  The gauges were last downloaded in mid-November.  Normally the gauges are left in place (recording data) from November/December until spring due to winter conditions; however, a download visit by the consultant could potentially be arranged sooner if there is a major concern or need to obtain the data earlier.

Also, Works, Operations and Maintenance (WOM) staff continue to visually monitor water levels in the FDC system.  On January 3, 2017 staff were out checking both inlets and outlets as well as the FDC system.  Staff will continue to monitor areas as required, and act accordingly, if needed.  Based on these visual observations, no major issues or concerns over the past few storms dating back to 2014 have been experienced.

Staff will advise, as in the past, if there are any concerns during or following any storm event.  WOM management staff also continue to be in contact with road patrol and dispatch during off-hours, in case there are any calls from residents that are experiencing any flooding.

“How were the FDCs functioning yesterday relative to a) the period of concern between 2011 and 2013 and b) how they were intended to function when first installed?”

Based on our visual observations, the system seemed to be functioning normally on January 3, 2017.  In order to compare system functioning to previous years, we cannot answer that question at this time without yet having the data downloaded and analyzed from the gauges.

“And finally, is there any concern today with too much water in the FDCs?”

The observations and findings presented to the public (March 26, 2015 public presentation and associated final report) regarding FDC surcharge and storm sewer leakage still remain valid.  Transportation and Works have been advancing the priority action plan noted at that time in conjunction with the consultant who supported the previous assessment.  The highest priority item in the plan was storm sewer lining, which is currently underway in the area of Black Walnut Trail.  Additional storm sewer lining in the area of Alderwood Trail and Osprey Boulevard is planned for later in 2017.  Further, the design of a utility trench dewatering system at Black Walnut Trail and Cactus Gate is currently underway, and is expected to be constructed in 2017.  Monitoring work remains ongoing to assess the effectiveness of these measures and to determine what additional measures, if any, are required.

Should you require further information or assistance regarding the Lisgar District FDC, please contact Jeremy Blair or myself.

Geoff Wright, P.Eng., MBA
Commissioner, Transportation & Works

Posted on January 16, 2017

Storm sewer lining begins

I am providing the City's latest update on the current Lisgar Implementation project which includes lining select storm sewers and dewatering of the utility trench.

Storm Sewer Lining

map of phase 1 storm sewer liningPipeflo Contracting has contracted with the City to complete the sewer lining works for the Phase 1 Area (please see right). They have completed their measurements and ordered the lining material as of October 7. Pipeflo has confirmed that the liners are being shipped October 28th, with an expected delivery date of two to three weeks. Pipeflo will therefore be initiating the pipe cleaning and preparation activities in early November in anticipation of beginning the liner installation in mid November. The City’s Consultant, AMEC Foster Wheeler, will have an inspector on site full time.

The City has prepared a Notice of Commencement letter and intends to mail this letter to all residents within the Phase 1 area.

Dewatering of the Utility Trench

Our consultant is proceeding with a preliminary design for the utility trench dewatering system, scheduled to be constructed next year.

Monitoring activities continue as planned through 2016 to support storm sewer lining works and dewatering of the utility trench. Further, the High Water Protocol remains in-place through 2016.

Posted October 31, 2016

Update on flood mitigation work

I am pleased to provide an update on the current Lisgar Implementation project which aims to prevent further flooding in the Lisgar District.
Dewatering of the Utility Trench
This past spring, pre-engineering work was completed to identify the location of utilities in the area of Black Walnut Trail and Cactus Gate. This work included minor earthworks, surveying and site restoration within parts of the park block and road right-of-way in the vicinity of the intersection. A geotechnical investigation that will include some borehole sampling in this area is planned for 2016.
The results from this pre-engineering work will aid in the development of a preliminary design for the pilot utility trench dewatering system.
Storm Sewer Lining
The first stage of the procurement process was successfully completed this past spring and included selecting an appropriate technology for lining of the storm sewers. The technology selected to best suit the projects needs was Ultraviolet (UV) Cured-In-Place-Pipe (CIPP) technology. Currently, the City is in the next stage of procurement to retain a qualified company to implement the lining work using this technology.
We anticipate storm sewer lining work to begin this September with plans to be developed to mitigate impacts to school areas, pedestrians and traffic. The image above shows the general areas (Black Walnut, Terragar, Smoke Tree) where the initial storm sewers will undergo this lining treatment. Further details of the work will be shared once a lining company has been retained and an approved work plan has been completed. In support of this upcoming lining work, the City recently completed flushing and closed circuit television (CCTV) inspections of these storm sewers.
Monitoring activities continue as planned through 2016 to support storm sewer lining works and dewatering of the utility trench. Further, the High Water Protocol remains in place.

Posted July 20, 2016

Class Action Law Suit Dropped

Earlier this year, the final report investigating the cause or causes of the basement water infiltration in some dwellings in the Lisgar area was submitted to the City with recommendations to address the concern. Based on the thoroughness of the consultant’s report demonstrating an absence of evidence of any negligence on the part of the City, the class action lawsuit filed against the City has been withdrawn. The $200 million suit was filed a few years ago by a local resident on behalf of all property owners in the Lisgar District but was never certified by a judge.

I am grateful to all those who worked so diligently on the report and to staff who made the extra efforts to prevent further water infiltration during the investigation. Many thanks especially to the affected residents who, despite the anxiety that came with every rainstorm and snow melt, demonstrated such patience throughout the years of this study. I am confident that the recommendations put forward earlier this year and already being acted upon will have a positive outcome for the whole community.

Posted Aug. 28, 2015

Councillors Approve Recommendations and Expand Sump Pump Subsidy

I am happy to let you know that the Foundation Drain Collector (FDC) Sump Pump Subsidy Program’s webpage, including application form and additional program details and eligibility information, are now available for interested homeowners at the following link:

This program replaces the previous Lisgar Sump Pump Subsidy Program. The new program is open to eligible homeowners that are located on a street serviced by the municipal Foundation Drain Collector (FDC) system, irrespective of any past occurrences of basement water infiltration.

To confirm if a property is located on a street serviced by the FDC system, homeowners are encouraged to call 3-1-1 or 905-615-4311 (if outside City limits), between 7 a.m. to 7 p.m. Monday to Friday. A figure showing approximate extents of the FDC system is available on the program’s webpage at the above link.

Residents with questions regarding the Foundation Drain Collector (FDC) Sump Pump Subsidy Program can call 3-1-1 to speak to a Customer Service Advisor or email

Posted Aug. 14, 2015

Councillors Approve Recommendations and Expand Sump Pump Subsidy

Councillors have approved the series of recommendations presented by City staff at General Committee on April 8. Phase 1 of the implementation earmarks $3.9 million from the Capital Reserve Fund for use in 2015. This means preparations and work can begin this summer on the two highest priority actions in the Prioritized Action Plan which are 1) Sealing the inside surface of the storm sewers in strategic locations with an impermeable liner to reduce/eliminate leakage into the utility trench and ultimately into the FDC system, and 2) Dewatering the bedding material around the FDC system at strategic locations to limit the accumulation of water in the utility trench and provide additional storage volume during storm events.

A sixth recommendation was added to the report and approved by Councillors as well, broadening the eligibility of the Lisgar District Sump Pump Subsidy to include all residents in the City of Mississauga that are on the FDC system. All these recommendations need to be approved at Council on April 15.

This is a very positive development and I am grateful to all involved for getting to this point and that resources are now in place to begin addressing a long-term solution. Thanks again to all of you who have continued to show great patience throughout the investigation.

Posted Apr. 9, 2015

Recommendations to begin Addressing Flooding Issues

Councillors will be asked to approve the following series of recommendations at General Committee on Wed., April 8, 9 a.m. at City Hall:

1. That the Prioritized Action Plan from the Lisgar District Basement Water Infiltration Investigation- Summary Report (March 2015) as outlined in the report dated March 27,2015, from the Commissioner of Transportation and Works titled Lisgar District Basement Water Infiltration Study Findings and Single Source Contract Award to Amec Foster Wheeler Environment & Infrastructure, File Ref Procurement No. FA.49.301-15 (Ward 10) be endorsed.

2. That PN 15-146 Lisgar District Implementation Projects- Phase 1 be established with a gross and net budget of $3.9 million.

3. That a by-law be enacted to fund PN 15-146 Lisgar District Implementation Projects- Phase 1 with $3.9 million from the Capital Reserve Fund (Account 33121).

4. That the Purchasing Agent be authorized to execute the appropriate forms of commitment to Amec Foster Wheeler Environment & Infrastructure in the estimated amount of $600,000 for the design, monitoring, contract administration and construction inspection services in support of the Lisgar District Implementation Projects -Phase 1.

5. That a copy of the report dated March 27, 2015, from the Commissioner of Transportation and Works titled Lisgar District Basement Water Infiltration Study Findings and Single Source Contract Award to Amec Foster Wheeler Environment & Infrastructure, File Ref Procurement No. FA.49.301-15 (Ward
10) be forwarded to Conservation Halton for information.

To see the entire Corporate Report, please click on this link:   (Item #1)

Posted Apr. 4, 2015

Video of Meeting Now Available

A videorecording of the Community Meeting has now been uploaded to the City's webpage. Follow this link to access the linke to the video as well as the other presentation slides and summary report.

Posted Apr. 4, 2015

Materials Available on Final Report

A presentation on the final report for the investigation into the basement water infiltarion in Lisgar was made at a community meeting on March 26. Follow this link to access the presentation slides and summary report on the City's web page.

A corporate report with staff recommendations will go to General Committee on April 8, 2015 (9 a.m. in the Council Chambers).

Posted Mar. 27, 2015

Public Meeting to Present Final Report Confirmed

The final report on the Lisgar District Basement Infiltration Investigation is being finalized and should be ready in the coming weeks. In light of that, I have booked a date and venue to hold a public meeting where residents will be briefed on the findings and recommendations prior to a Corporate Report going to Council in the spring.


Thursday, March 26, 2015 at 7 p.m. (doors open at 6:30 p.m.)
St. Simon Stock Catholic School - 6440 Lisgar Drive

I anticipate that city staff from Transportation & Works, Risk Management and Legal Services, the consultant AMEC, the external lawyer, and Mayor Crombie will be in attendance with me. I invite and encourage all interested and affected residents to join us as well.

Kindest regards,

Presentation Materials from Community Update Meeting

The City and Consultant have posted the study update and presentation materials from the June 17 public meeting on the City's web page. Please click this link to access these materials.

Community Update Meeting and Materials: June 17, 2014

I am hosting another community meeting where staff and the consultant will provide an update on the the basement flooding investigation. The update will include recent activities, latest findings so far, and remaining work to be completed. There will also be a time for questions and comments from the community.


Tuesday, June 17, 2014 at 7 p.m. (doors open at 6:30 p.m.)
Garry W. Morden Fire Training Centre - 7535 Ninth Line (north of the railroad tracks)

A brief update document has been prepared by the consultant and city staff to give some context to the presentation in advance of the meeting. Please review this and come with any questions you might have and to hear a more fulsome explanation of the status to date. I hope to see you on the 17th.

Kindest regards,

Lisgar Flood Study Report Update: May 29, 2014

I have some good news and some not-so-good news to share regarding the investigation into the flooding occurrences in the Lisgar District. The good news is that Phase II of the study is complete and additional monitoring and analysis have produced some notable findings. The not-so-good news is that the overall study is not complete and a third Phase is required to further analyze some of the new discoveries in Phase II as well as bring forward recommendations for improvements to the drainage system.

Yesterday, I met with staff from Transportation & Works, Risk Management, Legal Services and the consultant AMEC for a briefing of the latest findings in the study. Even though the overall project is not complete, I insisted that a community meeting be scheduled to give affected residents the opportunity to hear this update first-hand. You've waited a long time (and you'll be asked to wait a little longer for the final report) so providing this update now is a critical part of my commitment to communicating openly and regularly with you on this very important matter.

Please mark Tuesday evening, June 17 in your calendar for this community meeting. Staff and the consultant are available that night and I will confirm the date, time and location once a venue has been secured. T&W staff are preparing a letter and update summary document of the Phase II part of the study that will be made available to you in advance of the meeting.

I hope you can make it out on the 17th.

Kindest regards,

Lisgar Flood Study Report Update: May 13, 2014

No doubt you are anxious to hear any news about the results of the consultant’s study regarding the flooding in the Lisgar District. I am too. It’s been a long time coming and I thank you for the patience you have demonstrated. I want to reassure you that I have been continually requesting updates from the staff lead on this project, as the report has been delayed and is now long overdue. A few weeks ago, I was informed that the report is complete and I have just recently been able to schedule a meeting at the end of this month with the Mayor, City Works staff and legal representatives for a briefing on a summary of the findings. I will be requesting that a public meeting be held to provide an opportunity for the community to hear the results and recommendations first hand and to ask questions directly to staff and the consultant.
In the meantime, the City continues to monitor the creek, pond and storm water levels during high water warnings as a preventative measure and, thankfully, there have been no further reported incidences of flooding or leaks in the area. As well, I have put forward a Site Control Bylaw on developable lands in the Lisgar area to ensure that any further development does not negatively impact the storm water system for current and future residents.
I plan to provide another update to you in early June.

Kindest regards,

Lisgar Flooding and Sump Pump Q&A : October 31, 2013

In recent dialogue with some Lisgar residents, I have posed a series of questions to City of Mississauga staff in the Transportation and Works department and have been provided with the following response. Of particular note is that the consultant performing the engineering study is expected to provide the next set of findings to staff in December and our office would be briefed on the report in January.  As soon as I have the information, I will pass it along to you, the affected residents in Lisgar, and soon thereafter I will set up another public meeting where, together, we can address the matter and move toward a resolution. I look forward, as I’m sure you do as well, to getting answers and implementing solutions.

Kindest regards,

1.     Should a resident decide to install a sump pump and it becomes necessary for the pump to extract water from a flooded basement, where does the water get pumped to?  Storm water sewers? Via the roadway? How does this function exactly? Please be as specific as possible. 

To clarify, the sump pump is not intended to pump out a flooded basement but rather intended to pump water collected from the foundation drain onto grass surface of the homeowner’s lot.  As each residential property varies in terms of grading and landscaping, it is the homeowner’s responsibility to find a suitable point of discharge on their property.

2.     How did the City derive its $6,000 value on the installation of a sump pump?

The estimated maximum sump pump unit cost of $6,000 was based on similar municipal government subsidy programs for sump pump installations. This sump pump unit cost was also applied to the Rebate Program for Cooksville Creek as part of the Flooding Remediation and Action Plan with the $6,000 value being supported by reported sump pump installation costs as part of this program.

3.     Is the City able to provide the residents with a list of certified and eligible contractors that are a) able to install a sump pump and/or b) able do this work for $6,000, including tax?

The City is not able to provide residents with a list of contractors. Residents should investigate the available contractors and obtain confirmation directly from the contractor that they have a valid licence and that they are eligible to perform the work.

4.     It is our understanding that the High Water Protocol is a temporary measure put in place to mitigate further flooding during the ongoing investigation. Is it possible for the City to install an automated pumping solution on a more permanent basis to reduce the level of water in the Foundation Drain Collectors at strategic locations in the Lisgar District?

The City is investigating permanent automated pumping requirements to manage the observed FDC flows. As ample monitoring data is necessary to evaluate this option, the practicality of permanent automated pumping of the FDC will be assessed after the current monitoring phase for the Lisgar basement water infiltration investigation has been completed.

5.     When do you expect the next study report from the engineering consultant to be completed?

The engineering consultant that is currently investigating to determine the direct cause(s) of basement water infiltration in the Lisgar community is anticipating in-field monitoring to be completed at the end of November as part of this phase of work. The City anticipates receiving study findings from the consultant in December. Once City staff has completed its assessment of consultant’s findings, staff will provide the next update to the Councillor’s office regarding the study.

Lisgar Sump Pump Subsidy Program Update : October 23, 2013

I have been in contact with Martin Powell, commissioner of Transportation and Works with the City of Mississauga, about an error that was part of the Terms and Conditions of the Sump Pump Subsidy Program launched last week. Item number 24 indicated that there was a limited amount of funding available and the reimbursement would be issued on a first come, first served basis. This is not the case. There is no maximum on the available subsidy and therefore no rush to get your sump pump installed in order to beat your neighbours in the queue. 

As of October 24, the Terms and Conditions have been altered to reflect this correction.

Kindest regards,

Lisgar Sump Pump Subsidy Program : October 17, 2013

The City of Mississauga has established the Lisgar Sump Pump Subsidy Program and applications will be accepted starting Friday, October 18.

An application form along with additional program details and eligibility information is available on the City’s website for affected homeowners. A webpage has been developed specifically for the Lisgar Sump Pump Subsidy Program at the following link:

Residents who have reported basement water infiltration to the City, by either completing a flooding questionnaire or filing a claim, will receive notification of the program through a letter mailed to their home.

Once an application has been received and processed by City staff, the resident will be notified by mail if their application has been approved. The letter will indicate application approval and reimbursement will be provided under separate cover.

To assist residents in making a well-informed decision on installing a sump pump, we recommend that affected residents refer to the ‘Handbook for Reducing Basement Flooding’ by the Institute for Catastrophic Loss Reduction (ICLR) which can be found at the following link:

Any residents with questions regarding the Lisgar Sump Pump Subsidy Program are asked to call 311 to speak to a Customer Service Advisor or email

Lisgar District Flood Update : July 11, 2013

The City of Mississauga will be conducting a sewer smoke testing program in the Lisgar District between July 15 and July 26, 2013.  Smoke testing is an easy way for the City to test the foundation drain collector sewer system, and to potentially locate any deficiencies in the system. Residents are not required to be home for the smoke testing.

What is smoke testing? 

The smoke test consists of blowing vapour into the sewer manholes and pipes and observing where the smoke exists the system. The smoke is expected to exit out of manholes on the street, and along the perimeter of residences. 

The smoke used in the test has no odour and will disappear after a few minutes. 

Residents whose homes are affected by the testing have been sent a notice delivered directly to their homes.

Lisgar District Flood Update : July 5, 2013

I have posed a series of questions to our Transportation and Works staff and external consultant regarding the recent monitoring activities with respect to the flooding in our area.  The good news is that we have had plenty of rainfall over the last few weeks to gather data; the even better news is that there has been no further reports of flooding!

Unless there is some kind of emergency, I anticipate that the next update will come in the fall with further findings from the consultant’s ongoing study. Of course, I will continue monitoring the situation throughout the summer in case there are any unforeseen developments.

Also, as previously announced, Council approved the Sump Pump Subsidy – 50% of the cost up to $3,000 – and this past Wednesday, delegated authority to T&W staff to establish the program and execute agreements. The subsidy will be retroactive, provided that home owners had their pump installed after Jan. 1, 2008 and after having filed a claim with Risk Management, in addition to some other criteria. Further information on the subsidy will be provided once the program is set up and running sometime this fall.

Some of the information below is somewhat technical in nature; I trust you will be able to glean from it what is useful to you.

Kindest regards,


Dear Councillor McFadden, 

Thank you for the email from your office dated June 12, 2013, requesting an update regarding the Lisgar basement water infiltration investigation. The specific questions outlined in the email are listed below in italics, with our responses provided beneath.

1.     What new monitoring activities have taken place by AMEC since April 16, 2013?

The following monitoring activities have been completed by AMEC since April 16, 2013:

The following monitoring activities are still to be completed:

2.How many new gauges have been installed? Where have these gauges been installed? What is the total number of gauges currently being used by AMEC to monitor water levels as part of this study?

Total new water level gauges – 12, with a further 6 to come

-New FDC Gauges (3)

-New Storm Sewer Gauges (2)

-New Surface Water Gauges (3)

-New Groundwater Monitors (4)

-Pending additional Monitors – dependent on selection of secondary site (6)

Total number of water level gauges and groundwater gauges in place – 38 (doesn’t include the pending monitors for secondary monitoring site)

-12 Previous FDC Gauges, 3 additional FDC gauges = 15

-1 Previous Storm Sewer Gauge, 2 new storm sewer gauges = 3

-3 repeat surface water gauges (1 from 2012 not reinstalled), 3 new surface water gauges = 6

-10 repeat groundwater monitors (6 From 2012 decommissioned), 4 new groundwater monitors = 14

3.     Martin Powell made public mention of the FDC surcharging south of Britannia. Recognizing that findings may be preliminary at this time, please provide some additional comments as to what has been discovered, including where.

During the rainstorm on April 10th-12th, 2013, higher than expected water levels were observed in the FDC trunk sewer on Ninth Line south of Britannia Road.  To better understand the operation and performance of the FDC system in this area, additional monitoring devices have been deployed by AMEC as the basement water infiltration investigation continues.     [It is my understanding that this FDC trunk is located in the Ninth Line corridor on the west side of Ninth Line.--Sue]

4.     With the significant amount of rainfall so far this Spring, how many times has the High Water Protocol been enacted and, was there any time where water needed to be pumped out of the FDC?

The High Water Protocol has not been enacted since the rainfall events of April 10-12, 2013. During this 3-day period, the pumping equipment was operational and pumping water from the FDC on six (6) separate occasions. These locations included Osprey Boulevard, Black Walnut Trail, and Ninth Line. The pumps were running for approximately 10% of the total time they were deployed in the community from April 10-12, 2013.

5.     Have City staff made any changes/refinements to how/when the HWP is invoked?

Since our last response letter dated May 16, 2013, there have been no further changes/refinements to the High Water Protocol.

6.In light of Number 3 above, are there now additional High Water Protocol locations being considered where staff will be on stand-by to monitor water levels in the FDC?

As the High Water Protocol is mobile, City staff and the necessary pumping equipment can be relocated to different locations on an as-needed basis, including the FDC trunk south of Britannia Road.  

7.Has the City engaged the services of a Field Adjuster/Inspector yet? If not, when will this begin? If so, how many homes have been inspected to date?  The last update from Martin indicated that “additional details of this work, including dates/times of property visits, will be provided when this information becomes available.”  Is this still the intention?

The Risk Management Section has engaged the services of an independent Claims Adjuster. Ken Gibson, of Sterling Adjusters, will only be contacting residents of the Lisgar Area that have filed an insurance claim with the Risk Management Section.  The Adjuster will arrange a meeting and visit to each residence to obtain details of their specific claim; visual inspection, determine type and amount of damage, determine how water entered their home, etc.  The initial contact calls will commence the week of June 17, 2013.

We currently have a list of approximately 60 homes in the Lisgar area.  This listing excludes any residents who have issued a Statement of Claim against the City or who are represented by legal counsel.

As previously indicated, we continue our efforts to determine the source(s) of basement water infiltration in the Lisgar community.

Yours truly,
Jeremy Blair, P.Eng.


Sump Pump Subsidy Update II: June 19, 2013

Hello Lisgar residents,

A quick update following today’s Council Meeting…

The corporate report as presented by staff was approved with an amendment. In summary, all residents who have been affected by flooding in the Lisgar District and who decide to install a sump pump in their basement, will receive from the City of Mississauga 50% of the cost of the pump and installation up to a maximum of $3,000. This will not be restricted to the early bird residents that may apply on a first come, first served basis, as was highlighted in the original report; it will be available to all affected residents. The program will need to be set up over the coming weeks and I will provide a notification to you when residents can apply for the subsidy.

There was some discussion as to why Lisgar residents were receiving 50% subsidy when flooded residents in Cooksville recently received two-thirds coverage for sump pumps (three-way cost-sharing: 1/3 – city, 1/3 – region, 1/3 homeowner). Transportation & Works acting commissioner Joe Pitushka addressed this at Council today as well as sending this e-mail to Councillors prior to the meeting:

At the June 12, 2013 General Committee Meeting, there was discussion on providing equity with Cooksville with respect to the amount of sump pump subsidy proposed for the residents of Lisgar (i.e. 66% versus 50%).   I trust the following will help in clarifying the issue and provide rationale for staff’s recommendation:

In Cooksville, the purpose of the sump pump subsidy program was to assist homeowners in cases where the weeping tiles and sanitary drains were found to be interconnected and where the installation of a sump pump was recommended by the Household Drainage Survey in order to permit the installation of a sanitary backwater valve.  The interconnection between the weeping tile and the sanitary drain was permitted during the time certain homes in Cooksville were built but is now prohibited under the Region’s Sanitary Sewer Use By-law.  While it is the homeowners’ responsibility to rectify, given the joint interest between the City, Region and homeowner, a cost sharing formula of 1/3 : 1/3 : 1/3 was deemed reasonable in the Cooksville case.  The maximum subsidy provided was $2000 from the City and $2000 from the Region, based on the estimated average installation cost of $6000.  It is noteworthy that houses which were determined by the Household Drainage Survey to not have interconnected weeping tiles and sanitary drains were not eligible for the sump pump subsidy.

In the Lisgar District, homes were built based on a three-pipe system: dedicated foundation drain collector, storm and sanitary sewers.  Homes were built without an interconnection between the weeping tiles and sanitary drains and therefore a sump pump is generally not required to facilitate the installation of a sanitary backwater valve in a home.  Instead, the purpose of the proposed sump pump subsidy in the Lisgar District is to provide residents impacted by basement infiltration with financial support should they choose to install a sump pump as an additional safeguard for their home.  It is noted that the specific cause(s) of the basement infiltration occurrences have not yet been determined; it may be found that the installation of sump pumps will not be required as part of the solution or mitigation of the problem.  However, until such time, staff proposes that as a gesture of good will to the residents impacted by basement infiltration, a subsidy be offered which would reimburse 50% of the cost of a sump pump installation by a licensed plumber, up to a maximum of $3000, again based on the estimated average installation cost of $6000.

I also want to take this opportunity publicly thank Helen Ritchie and Suzanne Thistle for their deputations this morning at Council. Even though Council didn’t change the level of cost coverage on the subsidy, your presentations were important for the Councillors to hear. Thank you for taking the time to bring forward your concerns for yourselves and the larger community.

It is also important to note that this is not the final word on this matter by any means; it only an initial step in the journey toward a satisfactory resolution for all concerned.

Kindest regards,

Sump Pump Subsidy Update: June 13, 2013

FYI, the Sump Pump Subsidy item on the General Committee agenda (see post below) was referred without a recommendation to the June 19 Council meeting for further discussion (that is, no decision was made on this at the General Committee meeting). A link to the June 19 Council agenda will be posted here once it is available.

Sump Pump Subsidy Before Council: June 10, 2013

General Committee will discuss a Corporate Report on the Lisgar District Basement Water Infiltration Sump Pump Subsidy Program at its meeting on June 12, 2013 at 9:00 a.m. in the Council Chamber. (Due to the fact that this matter is tied to claims and compensation, and because I reside in the geographic boundary of the pending legal action against the City, I must declare a conflict of interest when this item is discussed.)

Link to the agenda

Response from Commissioner to April 18 memo: May 21, 2013

Dear Lisgar Residents,

Below is the response I received today from Transportation and Works commissioner Martin Powell to the memo I sent last month following our community meeting. City staff and the consultant have been meeting regularly since that meeting to go over their respective work plans for the next phase of the investigation and study.

The responses and explanations that follow are somewhat technical in nature and offer further in-depth insight into the function and processes that currently exist. I am pleased with some of the new initiatives that are being put in place and, even as I rely on the expertise of the city’s engineering team and the findings of the consultant to date, I will continue to pursue every avenue toward a solution to help protect you, your loved ones and your property.

I hope this information is helpful and, as always, if you have any questions, please feel free to write back.

Kindest regards,

Thank you for your email dated April 18, 2013, regarding priority items for the Lisgar basement water infiltration investigation. The priority items are listed below in italics, with our responses provided beneath.

1.     Investigating and taking any necessary steps to “undam” the waters at the southwest end of the Osprey Marsh near the Ninth Line overpass.

a.     This could include, as a start, cleaning and clearing debris and vegetation in the channel on the west side of Ninth Line;

It is important to understand the form and function of the Osprey Marsh Stormwater Management (SWM) Facility when discussing the potential for any further physical work in the area. This facility is classified as a “wet pond” and provides both water quality and water quantity control for the receiving watercourse system of Sixteen Mile Creek. Water quality control is achieved by the settling out of suspended solids in the pond, thereby lessening the amount of turbidity in the downstream receiving watercourse which protects aquatic life. Water quantity control is achieved by the detention of runoff from larger storm events which otherwise could contribute to erosion and flooding of the receiving watercourse system and could place infrastructure, property, or people at risk. The control weir/dam structure located upstream of the Ninth Line bridge is an essential part of the facility necessary to provide both water quality and quantity control functions.   

As part of the on-going investigation, the City’s consultant will be adding additional monitoring gauges in the Osprey Marsh SWM Facility and in the receiving watercourse downstream (tributary to the Sixteen Mile Creek). The purpose of this monitoring activity is to determine if the Osprey Marsh SWM Facility, its control weir/dam, or the receiving watercourse has any negative effect on the performance of the overall storm drainage system. Any further physical work in the area will be based on recommendations that result from the on-going engineering investigation. To date, the City does not have any evidence to suggest that the downstream creek is negatively impacting the Osprey Marsh SWM Facility or that the control weir of the facility is negatively impacting the upstream drainage system.    

Any physical work that may be recommended in the area would be subject to Conservation Halton approval, including any sediment and/or vegetation removal from within the channel corridor. Further, any proposed changes to the weir structure and facility design would be subject to approval from the Ministry of Environment.

It should be noted that natural and urban debris that is at-risk of creating a blockage is removed from this area, and throughout the entire Sixteen Mile Creek channel corridor, on a regular basis by City maintenance staff. The City will maintain this practice and urges residents to contact the City should they observe any debris in the corridor.

b.     Re-evaluating the use of rocks at the pond outlet structure.

The intended design and construction of the Osprey Marsh SWM Facility includes a rock-lined channel as part of the outlet structure to ensure the facility performs as intended. Previously, a number of rocks were manually dislodged from the channel banks and placed across the channel to form a makeshift pedestrian walkway. The City removed the walkway after confirming with Conservation Halton that no permits were required for this work. Despite the completion of this work, it is believed that the makeshift pedestrian walkway was not at-risk of creating a blockage of such magnitude as to alter the facility’s function.

As part of the on-going study, the City’s consultant will be investigating the facility, including the rock-lined channel at the pond outlet structure. Any further physical work to the Osprey Marsh SWM Facility will be based on recommendations that result from the on-going engineering investigation and would be subject to Conservation Halton and Ministry of Environment approval.  

2.     Expanding the scope of the consultant’s study to include interviewing the residents who have filed a claim for damages against the city to gain further insight in to how they were affected.

As an extension of our continued basement water infiltration investigation, the City will be utilizing the services of a Field Adjuster/Inspector who will contact and interview residents that have filed a claim with the City. The purpose of this work is to gather additional property-specific details regarding basement water infiltration and to assist the City and its consultant with determining the source(s) of basement water infiltration. The Adjuster/Inspector will also complete a visual inspection of the exterior of the home which may include taking photos where required. Additional details of this work, including dates/times of property visits, will be provided when this information becomes available.

3.     Lowering the threshold for when the High Water Protocol is invoked.

a.     That is to say, not waiting for a warning from Conservation Halton, but taking on the responsibility within the City to establish a threshold based on the investigative work done so far that takes into account ground saturation in combination with anticipated rainfall / snowmelt events.

To clarify, initiating the High Water Protocol is not strictly based on high water level warnings from Conservation Halton. The protocol can also be initiated based on field observations from City staff that takes into account several variables such as rainfall intensity, creek water levels, and foundation drain collector (FDC) water levels. As an example, the rainfall event during early April 2013 did not generate a high water level warning from Conservation Halton, however, field observations gathered from City staff initiated the High Water Protocol and mitigation measures were then put into action. The most practical way to initiate the High Water Protocol is to rely on the direction of on-site City staff in conjunction with consideration of high water level warnings from Conservation Halton which is the current practice. It should be noted that the High Water Protocol is continuously being refined by the City.

In the event the High Water Protocol is initiated, City staff may be on-site with pumps but may not necessarily be pumping depending on water levels observed in the FDC. In 2013 to-date, pumps have been running (based on observed water levels in the FDC) for approximately 5% of the total time they have been deployed in the community.

It is important to note that, despite the City’s best efforts, there is no guarantee that basement water infiltration will not occur when the City is operating the pumps.

The High Water Protocol is a temporary measure and not intended as a permanent long-term solution to address basement water infiltration in the area. The protocol is in-place until further recommendations are proposed based on the results of the on-going investigation.  

Martin Powell, P.Eng.
Commissioner, Transportation and Works
City of Mississauga


Community Meeting Follow-up: April 18, 2013

Hello Neighbours,

Thank you to everyone who was able to attend Tuesday night’s meeting at City Hall. Like you, I would have hoped for more answers than were available but, understandably, there was limited data from which to draw conclusions because of the unusually dry year in 2012. A path forward has been set out and, as I said at the meeting, I am committed to doing everything in my power to find a resolution to this matter as quickly as possible.

I have attached a letter that I sent to our Transportation & Works department outlining three key priorities that should be investigated in the near term. I will keep you updated as to when work begins and as findings are reported.

For those who weren’t able to attend the meeting, the presentation is now available online at:

I expect the copies of the DVD recording of the meeting to be available in the next 2 to 3 weeks and I will be sure to let you know when and how you can request a free copy if you would like one. If you have any questions or comments, please contact me anytime: 905-896-5010 or

Kindest regards,

Basement Water Infiltration Investigation Presentation

The presentation slides from the Community Update meeting on Tuesday, April 16 have been posted on the City's website and can be viewed here:

Community Meeting Date and Location Set

Please make note of the following date, time and location for the Community Meeting on this issue. I am hosting this meeting with officials from the City of Mississauga, Region of Peel, Conservation Halton and the external consultant AMEC to discuss AMEC's engineering study report related to the flooding in the Lisgar District. Affected residents are encouraged to attend to hear the presentation and ask questions, Tuesday, April 16, 7 p.m. in the Council Chamber at City Hall, 300 City Centre Drive. Doors open at 6:15 p.m. Free underground parking is available at City Hall after 6 p.m.

Activity update: Mar. 8, 2013

Dredging of the Sixteen Mile Creek is ongoing. The portion around the bridge near Osprey Boulevard was completed a few weeks ago, then dredging occurred near the pedestrian overpass and it is currently taking place at the Doug Leavens Boulevard bridge this week. This dredging is just one more in a long list of activities undertaken by the City and other agencies in our attempt to find a solution to the flooding problems that have affected many of you.

On that note, the consultant’s report has been submitted to the City’s legal staff. City and outside lawyers, along with members of the Transportation and Works department are reviewing the report. I look forward to being briefed on its contents in a few weeks’ time. Once the city’s review is complete, staff will put together a presentation which will be made available to the public at our Community Meeting in April.

Activity update: Feb. 28, 2013

Hello Lisgar Residents,

I wanted to send along a quick update to say that the dredging of the Osprey Pond and portions of the Sixteen Mile Creek began a few days ago and is ongoing, weather permitting. Also, please note that, as a preventative measure, the City’s High Water Protocol was implemented last night due to the significant snow/rain fall event. Crews were on standby to monitor the water levels in the drainage systems along the creek and pond and I understand no pumping of the foundation drain collectors was necessary.

Most importantly, I am currently trying to secure a date and location to hold a community meeting with you and all the other stakeholders (city, region, conservation, etc.) to discuss the external consultant’s report on the engineering study of the watershed and infrastructure in the Lisgar District.  The tentative date and location is Tuesday, April 9 at 7 p.m. I will send another notice when the details of the meeting, including location, are confirmed.

Thank you again for your patience. It remains my hope and goal that we will come to a fair and acceptable resolution to this matter very soon.

Kindest regards,

Activity update: Feb. 8, 2013

Toward the end of January, I posed a host of questions to the city's Transportation and Works staff and am pleased to offer their response to the Lisgar residents:

Rocks in the Pond

Environmental Services staff sought approval from the Watershed Engineering Services section at Conservation Halton (CH) to remove the rock crossing that has been created across the channel through the berm.   On Friday, February 1st, staff received an email from CH with permission to remove the rocks (a formal permit will not be required).  The maintenance personnel will be directed to remove these rocks as soon as possible. City standard stormwater pond warning signs are also being prepared and will be installed this Friday, February 1st. 

Observations made by Environmental Services staff during/after rainfall events suggest that the rock crossing is having a minor effect on the operation of the pond.  The concrete weir structure and the capacity of the downstream channel are primarily controlling the outflow from the pond, not the rocks.  However, staff would like to discourage people from crossing this channel for safety reasons and agree that it is important to remove the rocks and reinstate channel to its design condition. 

The rock lined channel was constructed through the berm as part of the outlet configuration retrofit project that was completed last winter.  This retrofit improved upon the original design of the pond as it dramatically reduces the time that water is detained in the pond following rainfall events.  The detention time for a ½ inch (13 mm) storm was over 100 hours - much longer than it needed to be to fulfill its water quality and quantity control objectives.  It is now just over 50 hours. 

West of Ninth Line

It is true that the channel west of Ninth Line restricts the flow of water out of the pond.  This is by design.  The pond is designed to detain water and release flows more slowly than the rate at which it enters the pond from the upstream creek.  The restrictive flow capacity of this channel is part of the outflow control design for the pond.  The flow capacity of the channel west of Ninth Line is controlled by the elevation of the Highway 407 creek that it discharges to and is nearly flat in gradient (<0.1%) over this reach, and therefore cannot be significantly improved.  The flatness of this channel has resulted in slow moving water and the tendency for sediments and vegetation to accumulate within it.  The engineering study which ultimately recommended last year’s pond outlet retrofit works concluded that this accumulation of sediments and vegetation will quickly re-appear if dredged out and therefore the pond outlet retrofit was designed based on the channel’s present condition.  The report went on to state that any benefit gained from dredging this channel would be modest and short-lived and that dredging is subject to rigorous regulatory approvals. 

Staff continues to recommend against seeking approval to dredge the channel until the engineering study has been received.   City and Conservation Halton staff met on site February 5 to view the erosion and sediment controls and other site preparations for the dredging works, as well as to view the vegetation growth at the Ninth Line culvert.

Staff also reports that various articles of urban debris were removed from the channel west of Ninth Line after the January 13th event passed.  The debris removed from the pond outlet channel on January 15, 2013 primarily included wooden pallets, similar to what was found and removed on a previous occasion in September of last year.  Staff has a protocol in place that includes an inspection of the entire creek corridor from the Osprey Marsh to the CP Rail tracks, including all of the storm outlet channels draining to it, as well as the outlet structure of the Osprey Marsh pond, to identify and remove debris.  Crews are dispatched to conduct these investigations and debris clean-up following all rainfall and snow melt events.


The most recent permit from Conservation Halton was received on January 14, 2013.   The application for this permit was first submitted to CH on July 24, 2012.  The first set of comments was received on August 28, 2012.  Regular dialogue and several on-site meetings followed with CH staff to resolve issues such as construction access, disruption to the natural corridor, the protection of fish and fish habitat, and channel hydraulics.  Detailed topographical survey and mapping work was conducted, engineering drawings were prepared and consulting services were procured to assist with the fish protection activities during construction.  This type of effort is not uncommon for instream channel works such as this. 

The work to dredge the creek by the Osprey Boulevard, Doug Leavens Boulevard and the pedestrian bridge crossings was originally scheduled to begin this week but weather and creek flow conditions have delayed the start of construction to next week (February 4).  The work is expected to take several weeks to substantially complete, with restoration works to the trail and natural corridor to follow in the spring/summer of this year.

With respect to the dredging of the storm outfall channels, ten have been dredged from Osprey Boulevard to just upstream of Doug Leavens Boulevard and three more will be dredged as part of the Doug Leavens and pedestrian bridge main channel dredging activities.

High Water Level Protocol

The High Water Level Protocol, which is invoked as soon as a High Water Bulletin is received from the conservation authority, includes the set-up of pumps in key locations to relieve flows from the FDC trunk sewer if required.  These locations include:  the west end of the Osprey Marsh pond, near Ninth Line; the east end of the pond, south of Osprey Boulevard; and near the Derry Road culvert over the creek. 

Prior to the rainfall and snowmelt event at the end of January, the only time the High Water Level Protocol was engaged in the Lisgar community in the past 14 months was on October 29, 2012, during the rainstorms associated with Hurricane Sandy.  The protocol was engaged for a second time on January 29 of this year.

The Study

Staff has been advised that the consultant will complete their report by the second week of March.  The exact scope and cost of the study will not be known until the consultant’s report and any follow up efforts are finalized.  The final scope of work cannot be predicted until the initial investigation is completed and further, unanticipated investigations are carried out, such as the return of results from the January 13, 2013 storm event.

It is acknowledged that during the meeting with the Mayor, the Councillor and staff on January 22nd it was stated that the report was expected by the end of February.  Subsequently, staff was advised that the report would be submitted to City staff two weeks later on account of the need to incorporate an analysis of the most recent storm events. As such, in the email prepared for the Mayor's office on January 25th it was stated that the AMEC's report was due (to staff) in early March.  Staff has since been advised that this remains the expected time-line.

Next Steps

In addition to the on-going and planned actions detailed above, staff intends to continue with the smoke testing of the FDC sewer system in the Lisgar area, including Lisgar Drive between Doug Leavens Boulevard and Osprey Boulevard.  The test is highly dependent on dry and mild to warm weather conditions to be effective.  As such, staff will be scheduling smoke testing in June, or earlier if conditions permit.  The testing may continue into July.

Dye testing will continue once suitable weather is upon us, and is most likely to be completed in the early spring.  Dye testing notices will be hand delivered to affected residences days prior to the scheduled test date.  A follow-up test will be scheduled to address the homes that were unavailable on the original test date.

Finally, as noted the consultant’s report is expected to be received in early March.  Once staff has reviewed the report a date for the community meeting will be set in consultation with your office.

The current list of planned actions is in large part based on results from the various investigations that have taken place over the last 14 months or so, such as closed-circuit video inspections of the FDC sewer mains, previous rounds of smoke testing, field monitoring observations by the consultant, as well as concerns raised by residents in the community.  It is possible that the findings of the AMEC's report may trigger the development of an additional list of investigations and/or actions to be undertaken by the City.

Letter and Update on Jan. 13 Rain Event: Jan. 22, 2013

As a result of the rain event and rapid melting that took place on Sunday, Jan. 13, seven homes were affected by water seepage in their basements. In response to this disappointing development, I have prepared the letter linked below to reassure the community that our office is working diligently to get answers to the many questions and concerns raised by homeowners. I have communicated directly with many individuals by e-mail, phone and face-to-face and have met multiple times with staff regarding what has taken place and the next steps moving forward. Check back to this space for continuing updates. If you live in the affected area, and would like my updates to come directly to your Inbox, please send me an e-mail at Thank you again for the patience you are demonstrating as we continue to work toward a suitable and sustainable solution.

Councillor's Letter

Memorandum from Transportation & Works: Dec. 3, 2012

Memo from Joe Pitushka, Director, Engineering & Works
Subject: Proposed Dye Testing of the Foundation Drain Collector (FDC) Sewer – (Z-56)

As part of the ongoing investigation into the basement flooding matters affecting residences in Zone 56, the Transportation and Works Department proposes dye testing of the Foundation Drain Collector Sewer System along the following roadways:

Dye testing is a procedure used by the Transportation and Works Department to determine and identify sources of cross-connected flows into the sewer systems. The dye used as part of the investigation is non-toxic, biodegradable and poses no harmful effects to humans, wildlife or the environment. The process requires staff to gain access into identified homes and pour the diluted dye into toilets and drains. Following the introduction of the dyed water, the downstream sanitary sewer maintenance hole is checked for the dyed mixture. The duration of the dye test lasts approximately 15 minutes per household. Testing has been scheduled to commence on Saturday, December 15, 2012. Once results of the dye tests have been reviewed, staff will provide a response detailing any recommended actions.

A copy of the notice that will be delivered to affected residences is available here.

Activity Update: Oct. 31

Earlier this month, I posed a series of questions to the Transportation and Works staff about specific issues related to their ongoing flood-response activities. I received the following response (see below).

I am happy with the efforts undertaken to date and that the City continues to make this a top priority. Furthermore, I am delighted that we have had no reports from residents of flooding this week throughout the Lisgar community.

Kindest regards,

1.      Residents are concerned with rocks at the pond’s outlet flow control structure which have been moved by passers-by to enable them to easily step across and over the water. Is this creating a dam?  Furthermore, is there a safety concern; after a rain event, water flows quickly over the rocks, causing slippery conditions.  Is it feasible to install some kind of permanent solution to a) either avoid this being a short cut pedestrian walk through – ie: installing fencing on both sides of the structure or b) eliminating the possibility of moving the rocks – ie: installing wire mesh over the rocks to secure them in place?

Transportation and Works Department staff inspected the Osprey Marsh pond outlet structure on October 22, 2012.  The unauthorized rock crossing was observed as described and appears to serve as a pedestrian shortcut through the stormwater management facility rather than going around to the Ninth Line bridge.   Although flows appear to be sufficiently getting through the rock crossing and just a minor impact on the water elevation in the pond was observed, Maintenance staff will schedule the removal of the rock crossing at their earliest opportunity.  Staff also advises that the placement of wire-mesh over the rocks is not favourable from a long-term maintenance or weir adjustment perspective and could be detrimental to the system. 

Regarding the safety concerns with the potential on-going issue of residents building and using a rock crossing over the pond outlet structure, as an initial approach staff will post additional warning signs in key areas to advise residents of the risks.  Staff will continue to monitor the condition of the outlet structure to ensure any future crossings are not negatively impacting the water level in the pond.  Staff will also evaluate methods to deter residents from accessing the outlet, possibly with plantings.  If these efforts prove unsuccessful, fencing will be considered as a last resort.

2.      A resident noted the lack of water flow on the west side of the Ninth Line underpass; there is thick brush along with plenty of garbage (including skids). Is the city doing anything to ensure the flow of water is not impeded on the west side of Ninth Line?

On October 19, 2012, Transportation and Works Department staff located and removed the refuse that had been dumped into the channel west of Ninth Line.  Staff would like to kindly encourage area residents to call 311 as soon as any indiscriminate dumping is encountered, to trigger a Service Request with maintenance staff.

The Transportation and Works Department Maintenance Section has included the Osprey Marsh pond outlet weir and channel on its list of storm outlets and watercourses that are routinely inspected and cleared of debris and refuse as required.

With respect to the thick growth of vegetation in the channel west of Ninth Line, staff notes that the physical characteristics of the channel, in terms of its relatively low slope and prolonged wet conditions, make it prone to vegetation growth.  This long-term heavy vegetation condition was accounted for in the design of the recently re-constructed pond outlet structure.  As such, this vegetation is not impeding the flow from the pond and staff advises that it is not necessary to remove the vegetation at this time.  Staff will continue to monitor and assess the vegetation conditions, however.   

3.      The city applied to Conservation Halton for a permit for in-stream dredging at three creek crossings back on July 16. Has this permit been approved? If not, what is the delay? When can you expect the permit to be approved and who is pushing the conservation authority to make this happen?

This permit has not yet been received, but dialogue with Conservation Halton staff has been on-going and co-operative.  CH provided a list of detailed comments on August 28th, which was followed up by a site meeting on September 10th to review their comments and concerns.  Additional field survey information and design details were requested, including grading drawings, notes on construction methods and materials, vegetation impacts and post-construction remediation plans.  Staff has been working to collect and compile this information and to prepare a revised set of drawings for re-submission.  This is expected to be completed and submitted to CH by November 2nd.

4.      A resident noted a huge boulder, previously taken out of the concrete-lined portion of the creek and placed near the edge of the creek, has been returned to the creek just north of the Osprey Bridge. It has been seen to affect the flow of water (and spread of water outside of the creek’s banks) during and after rain events. Is the city planning to remove the boulder again? If so, can staff dig a hole in which to place the boulder so it is not easily returned to the creek by those who frequent the woodlot?

This boulder will be removed as part of the bridge crossing dredging activities, once a permit has been issued.  As part of the dredging process, all excavated material removed from within the creek channel (including the subject boulder) will be hauled off-site and properly disposed of.

5.      I have been told that the creek has about 8 inches of sediment toward the bottom of the creek bed most of the way along the concrete-lined portion. Will this be dredged?

The dredging will be limited to a number of storm outfall channels and the creek bed in the immediate vicinity of Osprey Boulevard, Doug Leavens Boulevard and the pedestrian bridge behind Forest Bluff Crescent.  The needs, benefits and constraints of dredging the remainder of the creek will be evaluated as part of the Engineering Study.

6.      Is there an overall plan that the City and external Consultant have with respect to the work they are carrying out on this project? For example, are there more permits that the city will be applying for from Cons. Halton? Are there more gauges being installed and monitored? Will there be a careful analysis of the watershed north of the railway tracks? Etc.?  These are just examples. I am wondering… what is the master plan for the activities that remain to be completed before the end of the work and study?

The master plan that the City and the engineering consultant presented at the public meeting last December laid the groundwork for the efforts undertaken by both parties to date.  This plan has been adjusted or enhanced as needed, such as in the form of additional inspection works by the City or the installation of additional monitoring devices by the consultant.  To answer the specific questions:

Moving forward, the planned City activities are:

The planned Consultant activities are:

Activity Update: Sept. 28

Here is my latest update from City staff. —Sue

City Inspection and Maintenance Activities

Engineering Study 

As per the approved work plan, the Consultant has continued to gather field data since the previous update.  The monitoring has involved gathering information from multiple systems in multiple locations including:

Surface Water


Update: Sept. 25

The City of Mississauga received from Conservation Halton the first of two permits that it applied for over the summer.  This one is to dredge a number of storm outfall channels in the creek from Osprey Boulevard to just upstream of Doug Leavens Boulevard.  T&W staff and contractors will initiate their site preparation work on Sept. 26 and expect to commence the dredging activities later in the week.  They anticipate that work will take about two weeks to complete.  Some sections of the trail will have to be closed for short durations to bring equipment to/from the dredging sites.  Signage will be erected to inform residents of the work activities and T&W staff will also keep Parks staff apprised.

Activity Update: July 17

The following information is provided in response to my questions posed to City staff regarding the Lisgar flooding issue.

1.  Dredging along Sixteen Mile Creek:

A permit application was submitted to Conservation Halton by City staff in June to allow the dredging of a number of storm sewer outfall channels into the creek.  This application is currently under review by Conservation Halton staff.

Staff are currently finalizing an application for in-stream dredging at three creek crossings; namely, Osprey Boulevard, Doug Leavens Boulevard and the pedestrian bridge behind Forest Bluff Crescent. This application will be submitted to Conservation Halton the week of July 16.

With respect to the remainder of the Sixteen Mile Creek, its hydraulic conditions (flow capacity) and geomorphic conditions (physical form, as it changes over time) are currently being assessed by the engineering consultant (AMEC) as part of their study.  

2.  Cutting of Vegetation:

The vegetation along the in-stream (open water) portion of the creek corridor has been completed north to the CP railway. 

A small maintenance crew is continuing to trim the in-stream vegetation as it re-grows. 

3. Section of Creek west of Ninth Line (downstream of Osprey Marsh):

The hydraulic capacity of the outlet structure from the Osprey Marsh pond has been addressed by a recently completed Capital Works project.  No further creek works are planned downstream of the Osprey Marsh at this time.

Legal Update: June 11 and 20

For questions related to the Class Action law suit, please contact the City Solicitor.
For questions related to activities related to the flood, contact Transportation and Works.
To file a claim with the City, contact Risk Management.

I and my office are committed to continuing our support for the Lisgar residents affected by the flood. Please feel free to contact my office with questions or feedback.


Activity Update: June 7

The following is a summary of the preliminary findings and observations to date from the
consulting firm AMEC of their engineering study, as well as the City's inspection and
maintenance efforts in response to the Lisgar District flooding issues.

AMEC's engineering study:
• The engineering study being conducted by the consulting firm AMEC is progressing as
• To date, the following monitoring devices have been installed in the field:
a) Four (4) water level and temperature gauges in the Foundation Drain Collector
(FDC) sewer system; and,
b) Twelve (12) groundwater monitoring wells (piezometers), fitted with water level
and temperature gauges.
• With the exception of recent rain activity, little precipitation has fallen since the various
monitoring devices were installed in late December and early January. As a result, much
of the data collected so far reflects dry weather conditions and relatively small rainfall
events. Wet weather events that will inevitably occur during the remainder of the
monitoring and engineering study are expected to yield valuable information.
• The FDC sewer monitoring devices have observed low water levels (during dry weather)
with no surcharging (i.e. water levels rising to above the top of the sewer pipe, under
pressure). The data indicates that FDC flow response times following rainfall and
snowmelt events are relatively short. As noted previously however, the occurrence of
precipitation events during the remainder of the monitoring program is expected to
yield more comprehensive data for analysis.
• The groundwater monitoring devices confirm that the undisturbed soils are of low
hydraulic conductivity (i.e. water passes through it very slowly) and indicate that the
groundwater has limited interaction with the creek. Contribution of water from the
creek through the soil to the foundations of homes is of low likelihood.
• The groundwater monitoring device installed within the soil and granular stone backfill
and bedding material of a storm sewer pipe near the creek has observed that
groundwater in the bedding material appears to rise and fall in elevation in reaction to
rainfall events. Three (3) additional storm sewer bedding monitoring sites were added
in late May to develop a better understanding of the groundwater within the backfill
and bedding material of the sewer, including how it may be influenced by factors such
as rainfall, sewer flow and stream levels.
• Eight (8) additional FDC monitoring devices, a storm sewer flow monitoring device, four
(4) stream flow gauges, two (2) additional groundwater monitoring wells and a shallow
drive-point piezometer will be installed over the next month. A location is being sought
to accommodate the installation of a temporary rainfall gauge in the study area as well.
• A review of previous groundwater and geotechnical reports conducted within the Lisgar
District prior to the development of the area, as well as historical maps and Ministry of
Environment Water Well Records has been completed. The reports indicate that soils in
much of the area (Halton Till) have low hydraulic conductivity. The groundwater
appears to be high in some areas, with evidence of perched groundwater and isolated
artesian conditions (i.e. water rising to above the ground surface) in some areas.
• Hydraulic modelling and a fluvial geomorphic assessment of the Sixteen Mile Creek are
underway to:
a) assess the existing flow capacity of the creek to ensure that its primary drainage
objectives are being met;
b) provide information on the interactions (if any) between the creek and the
basement flooding issues; and,
c) provide guidance on the overall function, performance concerns and
recommended improvements to the creek, if required.
• It is noted that, to date, no needs for corrective or maintenance activities have been
identified by the engineering study. However, the results are still considered
preliminary. The monitoring efforts will increase in scope as discussed above and will
continue through the end of 2012.

City inspection and maintenance activities:
• City survey crews completed a topographical survey of the entire creek corridor from
the Osprey Marsh stormwater management facility to the CP Rail tracks. This
information was processed by staff and forwarded to the engineering consultant to
assist in their technical assessments of the creek.
• Cutting of the vegetation along the Sixteen Mile Creek has been completed from Osprey
Boulevard to just upstream of Terragar Boulevard.
• City staff submitted an application package to Conservation Halton on June 1st with
drawings and details to support the dredging of sediments from a number of storm
sewer outfall channels to the creek. Staff is currently preparing an application package
to allow the dredging of sediments and vegetation from the concrete lined channel
areas adjacent to the Osprey Boulevard and Doug Leavens Boulevard creek crossings.
This dredging work is planned to commence in July, subject to approval from
Conservation Halton. The dredging needs of the "naturalized" channel sections require
more detailed study, for which the consultant will be providing professional advice as
part of their assignment.
• Flushing and closed circuit TV inspections of the FDC sewer have been completed on the
roads that were affected by flooding. Staff is in the process of reviewing the gathered
information. Planning efforts are underway to expand the FDC sewer flushing and CCTV
inspections to other areas.
• City crews are in the process of clearing materials accumulated in the bottoms of FDC
manholes and sealing some isolated manholes where water might be able to enter the
• The FDC trunk sewer manhole marker signs have been prepared and have been installed
along the creek corridor.
• Staff advises that indiscriminate dumping activities along the Sixteen Mile Creek
continues to occur, which is causing time-consuming and costly clean up operations for
City crews.

Activity Update: Apr. 30

I'm providing the following update on the recent work carried out by the city and the city's engineering consultant.

City inspection and maintenance activities:

Consultant's engineering study:

Activity Update: Mar. 30

The City continues with its efforts toward finding a solution to the cause of the flooding in Lisgar last fall. An independent consultant (AMEC) was hired to perform an engineering study on the storm sewer system as well as the creek and pond and is scheduled to release its interim report some time in April.

In the meantime, the Sixteen Mile Creek has been the focus of significant work with the cutting of vegetation along the channel to improve the flow of water. In January, crews began this work at the south end of the creek where it meets the Osprey Pond and they are moving north of Derry Road at the start of April where the work will be completed just north of Terragar Boulevard where the instream vegetation tapers off.

This past month, City of Mississauga and Conservation Halton staff conducted a detailed inspection of the dredging needs of creek. The initial focus is on the storm outfall channels and sections of the creek which are concrete lined. The dredging needs of the “naturalized” channel sections (north of Bishop Strachan Court) require more detailed study, for which the City’s consultant will be providing professional advice as part of their assignment.

Activity Update: Mar. 6

March 6, 2012—As part of my commitment to keep residents informed as much as possible, please find below my latest update on the ongoing activities around the Sixteen Mile Creek and Osprey Pond related to the flooding.

Many thanks to the residents who have e-mailed my office over the past month with questions or concerns about the activities taking place in the area. You are our “eyes on the street” so to speak, and the information you provide is helpful to the ongoing work and investigation.

Activity Update: Jan. 25

January 25, 2012—The following is a summary of the activities undertaken by Transportation & Works in the Lisgar community since the first week of January:

Activity During and Following Jan. 23 Rainfall

January 24, 2012—During the rain on January 23, the Area Supervisor and Assistant Supervisor completed a site condition review and found that the FDC, Storm and Creek systems were operating within normal parameters.

Transportation & Works staff was on site reviewing the state of our systems and ensuring that the systems were operating in accordance to established parameters. We will continue with our field work to ensure the integrity of the FDC System and the removal of a 4.5m swath of vegetation centred on the Sixteen Mile creek low flow channel. We will also continue to monitor this area during any significant rainfall.

Activity Update: Jan 6, 2012

January 6, 2012—The following is an update on the recent activities undertaken by Transportation & Works in the Lisgar community:

Community Meeting on Lisgar Flooding: Dec. 15, 2011

December 15, 2011—About 200 residents were updated at a community meeting on December 14 about the city’s ongoing investigation and activities related to the flooding issues in the Lisgar community.

The focus of the meeting was on outlining the steps that city and regional staff have undertaken toward finding the root cause or causes of the flooding.

The issue of possible compensation will be addressed following the submission of an engineering study by an external consultant expected in early 2013.

In the meantime, the city will respond immediately as necessary to findings in the study prior to its completion. In addition, during High Water Warnings, city crews will be dispatched to strategic locations in the Lisgar area to monitor water levels and take appropriate action to mitigate further problems.

Presentation Materials:
Visit to download the slide presentation from the meeting.
E-mail to request a copy of the DVD recording of the meeting.
Call 905-791-7800 x4615 to request a household drainage survey for your home provided free of charge by the Regional of Peel.