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HomeMy WebLinkAboutFlood Control and Water Conservation Advisory Board 1983 ~ C-l , the metropolitan toronto and region conservation authority minutes FLOOD CONTROL AND WATER CONSERVATION ADVISORY BOARD 18-March-1983 U/83 The Flood Control and Water Conservation Advisory Board met at the Authority Office, 5 Shoreham Drive, Downsview, on Friday, 18 March, 1983. PRESENT Cha i rman J S. Scott Members R.J. Crowe James Davidson Mrs. F. Edna Gardner Prof. R.L. James W.J. Ke 11 y Luciano Martin Mrs. M. prinsloo Mrs. N. Stoner James Witty ABSENT Vice-Chairman W.R. Herridge, Q.C Members A.D. Hollingshead El'dred King F.J. McKechnie '1INUTES Res. U Moved by L. Martin Seconded by: Mrs. M. prinsloo THAT the Minutes of Meeting t2/82 be approved CARRIED. PROGRESS REPORTS Verbal reports were presented, as follows: .Erosion and flood control works carried out in 1982, and 1983 Erosion Control Programme (J.C. Mather, R.W. Dewell) .Development Control (J.W. Maletich) Water Theme Co-ordinator - Kortright Centre (P. Attfield) Keating Channel Environmental Assessment (B.E. Denney) Preliminary Engineering - Highland Creek Erosion Study (J C. Mather) Res t2 :::.....-Moved by: J Wi tty Seconded by: Mrs. N. Stoner THAT the Progress Reports be received. CARRIED. C-2 -2- 1983 BUDGET CONSTRAINT IMPLICATIONS Res 113 Moved by Mrs. F Edna Gardner Seconded by Mrs N Stoner THAT the report on 1983 Budget Constraint Implications be received CARRIED PROJECT FOR FLOOD PROTECTION DYKES - DUFFIN CREEK, TOWNS OF PICKERING/AJAX, THE REGIONAL MUNICIPALITY OF DURHAM MARCH 198.3 Res #4 Moved by Mrs N Stoner Seconded by J Witty THE BOARD RECOMMENDS THAT a "Project for Flood Protection Dykes - Duffin Creek, Towns of Pickering/Ajax, The Regional Municipality of Durham - March 1983", as appended as Schedule "A" of these Minutes, be approved; AND FURTHER that the following action be taken in connection therewith (al The Regional Municipality of Durham be designated benefiting municipality on the basis set forth in the project; (b) The Government of Ontario be requested to approve the project and a grant of 55% of the cost thereof; (cl Pursuant to Section 23 of the Conservation Authorities Act, approval of the O~tario Municipal Board be requested, if required; (d) When approved, the appropriate Authority officials be authorised to take whatever action is required in connection with the project, including the execution of any documents CARRIED. PRELIMINARY ENGINEERING STUDY, DON RIVER AT BLOOR STREET -Terms of Reference Res #5 Moved by: Mrs. N. Stoner Seconded by L. Martin THE BOARD RECOMMENDS THAT the Terms of Reference for the Preliminary Engineering Study of the flooding problem on the Don River at Bloor Street be approved CARRIED. MASTER DRAINAGE PLANNING TOWN OF WHITCHURCH-STOUFFVILLE Res *6 Moved by Mrs F Edna Gardner Seconded by L Martin THAT staff report on Master Drainage Planning - Town of Whitchurch-Stouffville be received. CARRIED NEW BUSINESS The Chairman advised that a joint meeting of this board and the Waterfront Advisory Board may be called in May regarding the Keating Channel A further meeting of the Flood Control and Water Conservation Advisory Board may be scheduled for May Tours of 1983 work sites may also be arranged -- possibly one in the eastern and one in the western area. TERMINATION On motion, the meeting adjourned at 12 30 pm., March 18 J S Scott W E. Jones Chalrman Secretary-Treasurer KC C-3 SCHEDULE "A" THE METROPOLITAN TORONTO AND REGION CONSERVATION AUTHORITY PROJECT FOR FLOOD PROTECTION DYKES - DUFFIN CREEK TOWNS OF PICKERING/AJAX REGIONAL MUNICIPALITY OF DURHAM MARCH, 1983 C-4 CONTENTS OF BRIEF Page PURPOSE 1 LOCATION AND DESCRIPTION 2 HISTORY OF FLOODING 5 PROPERTY REQUIREMENTS 7 COSTS AND FINANCING 8 APPROVALS 9 C-5 - 1 - PURPOSE The purpose of this project is to permit The Metropolitan Toronto and Region Conservation Authority to exercise the powers afforded by The Conservation Authorities Act R S 0 1970, Chap 78 as amended to establish and undertake in the area over which it has jurisdiction, a program designed to further the conservation, restoration, development and management of natural resources in accordance with the Flood Control Program of the Watershed Plan The purpose of this project is to meet one of the defined objectives of the Flood Control Program which is to provide in defined flood damage centres, on a priority basis, protection that will reduce the risk of flooding to less than 50% over the life (100 years) of the affected structure(s) Protection to a higher level will be provided if economically and/or socially justified The achievement of this objective in the Pickering/Ajax Damage Centres will also achieve the goal of the Authority's Flood Control Program which is defined in the Authority's Watershed Plan as "To undertake a comprehensive program of Flood Control Designed to Prevent, Eliminate, or Reduce the Risk of Hazard to Life and Property, while cognizant of the Natural Attributes of the Valley System " Through this project, the Metropolitan Toronto and Region Conservation Authority will implement dyking along the Main and West branches of the Duffin Creek through the Towns of Pickering and Ajax The completion of the dyking works will reduce considerably the risk of flood hazard to the communities This project will be undertaken in accordance with the requirements of The Environmental Assessment Act C-6 - 2 - LOCATION AND DESCRIPTION In the development of the Flood Control Program for the Watershed Plan, th~ Authority identified those areas of development concentrations within the floodplain which formed integral parts of existing communities These areas were defined as Damage Centres and inherent in this definition is a susceptibility to flooding to the extent where potential damages and community disruption are significant Based on a ranking of such factors as expected damage, threat to life, disruption of transportation routes, etc , the Damage Centres were ranked on a priority basis in order that the Authority could achieve its objective of providing flood protective works to these flood vulnerable areas in a sequence based on degree of hazard In this regard, the Authority identified the Pickering/Ajax area as a Damage Centre and ranked it 4th out of 14 sites This relatively high ranking is due to the frequency of flooding and the potential for more severe flooding The proposed works to be carried out in accordance with this project will involve the floodplains of both the Main and West Branches of the Duffin Creek through the Towns of Pickering and Ajax (Fig 1) A substantial amount of development in both Pickering and Ajax is located within the floodplain of the Duffin Creek This development is primarily the older established portion of the communities which as in most other communities historically located next to the rivers for power, navigation and water supply The river at this point flows through a large ill-defined valley, with wide flat overbanks These overbank areas are susceptible to flooding on an almost annual basis A detailed description of the flood history of this area is provided in the next section entitled History of Flooding The limits of the Pickering/Ajax Damage Centres were identified on the basis of the area which would be flooded by the Regional Storm as per Fig 2 In accordance with the Authority's stated objective of providing at least a minimum level of protection to those Damage Centres which had a risk of flooding greater than 50% over an assumed life of 100 years, those areas which do not meet this criterion are located within the 1 150 year flood line as shown on Fig 3 The preliminary engineering study carried out to study the flooding problem recommended a solution to provide this minimum level of protection and also recommended that a higher level of protection could be justified This higher level would reduce the risk of flooding to 18% or protection to the 1 500 year flood event The areas flooded by the 500 year flood event is shown on Fig 4 These recommendations were based on an analysis of the costs and benefits associated with the proposed works A summary of the damages associated with various flood frequencies is provided in Table 1 r C-7 I :II <: .., :II IJ) 6 .., TOWN ~ OF AJAX ~ 0 Q :II P I-~...... / ---.. \ \ \ \ , I I 1 KINGSTON RO (HWY No. 2) n ~ S! TO)NN OF ~ PICKERING ~ HWY, No. 401 I I I I I I I ~ - the metropolitan toronto and region F1GURE 1 , conservation authority \} I )' ()) ~0 ~.-.--- \ \~' . " \ \ \ . \ '. .. . ------~\ / ~ '1- \ \---:\ ' . \ \ . . \ , . \ \ ~ \ ... . - , .0. Q ~ ~ . ! ('''-. .. . .' ) I ~ . ~ the metropolitan toronto and region LOCATION OF STUDY AREA FIGURE 2 , conservation authority , .I j' I r 0 "",--~-- i I '\ i~' . I,,' \ ,. \ \ \ . \ I \ ~ '. . ...- -~....\ .. ~ .. . n . '. \ . . \ \ I ~ I .QIO 0 ~ ! ('''' ... . .' ) I ~ AREAS SUSCEPTIBLE TO fLOODING 150 YEAR fLOOD -.- fiGURE :5 the metropolitan toronto and region BELOW M. T.R.CA MINIMUM CRITERIA () , , conservation authority \0 () I ~ 0 j' ...-..... "0 ~- . \\ ,,' \ \ . '. ~ '. . ......--~. - \ ...- \ I .. ~ .. \ \~~ . . '. \ . \ \ ~ \ IQ. 0 0 ~ ! .---- ~ the metropolitan toronto and rag ion . I AREAS SUSCEPTIBLE TO FLOODING 500 YEAR FLOOD LINE ....... FIGURE 4 BELOW M.T.R.C.A. MINIMUM CRITERIA I I V conservation authority C-ll - 3 - TABLE 1 PICKERING/AJAX DAMAGE CENTRES SUMMARY TABLE Risk of Flooding Return over 100 Conuner- Resi- Depth of Period year life cial dential Total Flooding Damage $ Value $ Annually 100% 2 7 9 0-0 3m 10,515 - 25 yr 98% 3 9 12 0-0 3m 70,300 - 100 yr 63% 5 17 22 0-0 8m 165,000 - 150 yr 49% 5 18 23 0-1 Om 206,700 1,217,000 350 yr 25% 5 25 30 0-1 5m 396,500 1,512,000 500 yr 18% 5 27 32 0-1 5m 420,825 1,607,000 Regional - 37 71 108 0-4 Om 10,581,700 22,760,000 The damages estimated in Table 1 represent only the tangible losses and do not include such intangibles as lost revenues, human suffering and inconvenience, loss of life, etc The "Value" figure represents an estimated net worth of the properties affected Based on this information, the present value of the average annual damages was determined to be $175,000 utilizing a 6% discount rate Again this represents only the pr~sent worth of the tangible costs The most economically viable and environmentally acceptable solution to achieving the minimum level of protection is the construction of 2 dykes located as shown on Figure 5 Due to the wide flat overbanks described earlier there is a relatively small difference between the 1 150 year flood event and the 1 500 flood As a result, the additional cost for providing the 500 year protection is very small The estimated additional cost is estimated to be only $25,000 and therefore, the alternative of providing 500 year protection is recommended The total estimated cost for the recommended alternative is $350,000 Although this cost compared to the present value of the damages gives a cost/benefit ratio of 0 5, it is expected that if the intangible benefits were able to be costed that a more favourable cost/benefit ratio could be obtained A summary of the intangible costs is provided below -- n I J ~ .- I\) .- . " \ . . \ ~ .. " '" .. .---\ \ \ \ . . I ... \ . ~ ..., .. '\, ) I \ - ~ the metropolitan toronto and region DYKE LOCATION .... I , conservation authority 500 YEAR FLOOD LINE ......... I FIGURE 5 C-13 - 4 - Although it is always difficult to assign dollar values to the intangible items, it is important that they be considered Items which are included as intangibles are the social disruption to the Pickering/Ajax communities, road closures causing traffic disruptions and the hampering of emergency vehicular traffic, damages to municipal services such as water supply and sewers resulting in public health problems, evacuation of local residents and the threat to loss of life Since flooding of this area occurs on an almost annual basis, the intangible costs are significant The need for the municipality to continue to pump out basements once or twice a year plus the inconvenience to the residents represents a considerable expense Also the lost revenues by the commercial properties and the potential loss of future business and good will must be considered when attempting to define the more intangible affects associated with flooding In this regard, the recommendation to provide 500 year flood protection to the pickering/Ajax Damage Centres is deemed to be appropriate and justified The relatively small cost for remedial works which provide such a high level of protection is certainly warranted The components of the remedial works required to provide 500 year protection is the same as that shown on Figure 5 The additional costs are for a slight increase in the height of the berms The dyke proposed to provide protection to the flood susceptible area north of Highway No 2 runs from Brock Road along the West and Main Branches of the Duffin Creek and ties into the highway west of the Duffin Creek Highway No 2 bridge The second dyke will provide protection to the flood susceptible area along Church Street north of the Church Street bridge The dyke will begin at the west side of Church Street north of the Creek and tie into a high point of land to the north-west of the study area The proposed dykes have been layed out along locations where the least amount of disturbance to the existing environment would occur and also where the impact upon private properties has been minimized The dykes were also located in ord'er to allow the river system to utilize the maximum amount of existing floodplain wherever possible The internal drainage within the areas ~ be protected by the dykes will be carried out through the construction of drainage structures (culverts) with one way flow gates to ensure against backwater flow into the protected areas A typical cross-section of the proposed dykes is shown on Figure 6 n I ~ -to" . DUFFIN CREEK ~ the metropolitan toronto and region CROSS SECTION OF DYKE AND FLOOD PLAIN FIG. 6 V conservation authonty C-15 - 5 - HISTORY OF FLOODING Flooding of the Duffin Creek in the Pickering/Ajax Damage Centres has been recorded as early as 1886 For the period between 1886 and 1982 this area has flooded at least 32 times The majority of the flooding occurs in the spring time both as a result of high flows and ice jamming A chronological list of the recorded floods for the Pickering area follows Detailed accounts of the flooding are not available for the majority of the flood occurrances More information however is available for the more recent events This information indicates that flooding can last from 6 hours to 2 1/2 days On several of these occasions the municipality was required to provide assistance to the residents in the form of basement pump outs, evacuation of residents and culvert cleanout Flooding in this area has become an almost annual event It is for this reason plus the susceptibility to more severe flooding that the Authority rated this area number 4 on its priority list of 14 Damage Centres requiring remedial work The following photographs illustrate the flooding problem in this area as well as depicting the type of development located within the Damage Centre DUFFIN CREEK FLOOD HISTORY PICKERING VILLAGE The following floods have been reported 1886, March 2 - caused by spring melt - parts of village flooded 1890, June 5 - caused by heavy rains and thunderstorms of previous two days - local bridges damaged - telegraph lines down - cellars flooded - roads washed out, some livestock lost 1936, March 11 - caused by spring melt plus rain - roads flooded and damaged 1942, March 9 & 17 - caused by ice jams - roads blocked and damaged 1948, March 16 - Hwy 2 flooded 6 inches deep 1949, February 15 - roads blocked and damaged 1950, January 26, - a series of floods aggravated March 25-26, by ice-jams April 4 - damage to roads and houses 1951, April 12 - roads flooded C-16 - 6 - 1951, July 16 - caused by heavy rain - roads flooded 1952, February 4, - roads flooded March 11 1953, February 21 - caused by ice-jam - roads and one home flooded 1953, March 4 - Hwy 2 flooded 1954, February 15 - roads flooded 1954, February 21 - Hwy 2 flooded October 15-16 - Local roads flooded (Hurricane Hazel) - at least one family forced out 1955, March 1 - Hwy 2 flooded 2 feet deep at Church Street 1956, March 7 - caused by ice-jam - ice chunks and water on Riverside Drive, 12 families evacuated - Hwy 2 and nearby houses flooded 1959, April 2 - Hwy 2 flooded briefly 1959, April 8 - caused by ice-jams - Riverside Drive, Hwy 2 flooded to about 2 inches deep - 2 families evacuated 1960, March 28-31 - Rwy 2 at Church Street flooded 6 inches to 1 foot deep 1960, April 2-3 - Hwy 2 flooded and closed briefly 1961, February 23 - footbridge over a tributary washed out near Riverside Drive, one couple temporarily stranded at a cottage 1979, December 25 - flooding north of Hwy 2 - flooding along Church Street 1980, March 21 - flooding north of Hwy 2 - flooding along Church Street 1981, February 18-21 - duration 2 1/2 days, 2 separate events - flooding - Hwy 2 - north - Church Street - Fire Department (PiCkering) called to help in residence completely innundated 1982, March 31 - April 1 - flood north of Hwy 2 and by Church Street - several residences completely innundated - M T C out to unclog culverts - offered to evacuate Not undertaken C-17 FLOOD OF MARCH 1981 \ '1 II J --- ~,J, . FLOODING OF RESIDENCE NORTH OF HWY *2, SOUTH OF DUFFIN CREEK IN PICKERING \ ij , ,.- \ ~T~-~' - I I FLOODING OF MOTEL NORTH OF HWY #2, WEST OF DUFFIN CREEK IN AJAX c-18 - 7 - PROPERTY REQUIREMENTS Since the major amount of property required for this project is presently owned by this Authority, only a small amount of additional properties will be required These properties if required will be acquired under the Land Acquisition Project 1982-1984 of the Watershed Plan and therefore will not form part of this project C-19 - 8 - COSTS AND FINANCING The expenditures require~ to implement this project shall be understood to include engineering and geotechnical studies, site supervision, environmental assessment and all materials, labour, equipment, etc associated with the construction Costs Highway No 2 to Activity Church Street Dyke Brock Road Dyke MObilization/Demobilization $ 3,500 $ 9,000 Cleaning & Grubbing $ 5,000 $ 9,000 Stripping & Storing Topsoil $ 2,800 $ 4,500 Importing & placing material $ 47,800 $ 68,100 Replacing Topsoil $ 6,000 $ 13,500 Seeding, Sodding & Mulching $ 7,500 $ 15,500 Restoration $ 2,000 $ 5,000 Drainage Structures $ 10,000 $ 40,500 Bonds & Insurance, Engineering, Legal, Inflation & Contingency Allowance $ 40,400 $ 59,900 Total $125,000 $225,000 Project Total $350,000 Financing This project will be funded as follows 1984 Province of Ontario $192,500 Authority $157,500 $350,000 The Regional Municipality of Durham is designated as the benefiting municipality to raise the Authority's share of the cost of the work being 45% of the total C-20 - 9 - APPROVALS ~ C-2l , the metropolitan toronto and region conservation authority minutes FLOOD CONTROL AND WATER CONSERVATION ADVISORY BOARD 28-JUNE-1.983 #2/83 The Flood Control and Water Conservation Advisory Board met at the Authority Office, 5 Shoreham Drive, Downsview, on Tuesday, 28 June 1983. PRESENT Chairman J.S. Scott Vice Chairman W.R. Herridge, Q.C. Members R.J. Crowe James Davidson Mrs. F.E. Gardner Prof. R.L. James W.J. Kelly Luciano Martin F.J. McKechnie Chairman of the Authority Mrs. F.E. Gell Vice Chairman of the Authority E.V. Kolb ABSENT Members A.D. Hollingshead Eldred King ~ Mrs. M. prinsloo Mrs. N. Stoner James Witty MINUTES , Res. #7 Moved by: L. Martin Seconded by Prof. R.L. James THAT the Minutes of Meeting #1/83 be approved. CARRIED; PROGRESS REPORTS J.C. Mather presented a verbal report as follows: . Erosion and Sediment Control Program. Work has been completed on the two-year project at Wynford Heights. Two big sites will be started later this year at Delroy Drive and Beaucourt Road on the Mimico Creek. . Flood Control Program at Bolton - Phase I - is almost completed. Phase II will be completed sometime in October. . Flood Control Program - The Pickering-Ajax Flood Control Project has been approved by the full Authority. This will now be forwarded to the Ministry of Natural Resources and Region of Durham for approval. . Flood Plain Land Acquisition. The Authority approved the purchase of the Toronto Brick Works at the last full Authority meeting. I I I - 2 - C-22 . Keating Channel Environmental Assessment The final report will be sent to the Ministry of the Environment within one week. In the meantime staff is attempting to arrange a meeting with the Minister. . German Mills Creek Preliminary Engineering Study is now being printed. Copy of this report will be ready for the next meeting of the Advisory Board. . Major Maintenance - On the lower Humber, upstream of the Old Mill, gabion repairs have been completed. Preliminary Engineering Study on Highland Creek has been completed and printed. Report is now available. This study will form a basis for a three- or four-year project which will address the problems on the 15 sites named in the study HIGHLAND CREEK - Erosion Control Staff has now been advised that the funding of $150,000. for this project has been made available, and therefore work will be started on the two sites this project covers. MIMICO CREEK STUDY The report is at the printers and will be available in the near future. The study addressed the problem of potential flooding in Mississauga caused by Brampton development, and it confirms that the Authority's initial flood lines and analysis of Mimico Creek were correct. As a result, the City of Brampton is reconsidering its Master Drainage Plan and will discuss same with developers. Res. #8 Moved by F.J. McKechnie Seconded by W.J. Kelly IT IS RECOMMENDED THAT The Metropolitan Toronto and Region Conservation Authority adopt the position that the Storm Water Management Plan for OPA.6 be implemented prior to, or concurrent with, approval of any further development in the OPA.6 area of Brampton. CARRIED; STORM WATER MANAGEMENT There was a short film presentation on Storm Water Management. TERMINATION ON MOTION, the meeting adjoured at 11.15 a.m. and members left on a planned tour. J.S. Scott Warren E. Jones Chairman Secretary-Treasurer em ~ C-23 V the metropolitan toronto and region conservation authority minutes FLOOD CONTROL AND WATER n/83 CONSERVATION ADVISORY BOARD September 8, 1983 The Flood Control and Water Conservation Advisory Board met at the Authority office, 5 Shoreham Drive, Downsview, on Thursday, September 8, 1983. PRESENT Chairman J.S Scott Members R J Crowe Mrs F E Gardner W J Kelly L. Martin Mrs N Stoner J witty Chairman of the Authority Mrs. F E. Gell ABSENT Vice Chairman W R Herridge, Q.C. Members James Davidson ~ Prof R L James Eldred King F J McKechnie . Mrs M prinsloo MINUTES Res ~9 Moved by Mrs N Stoner Seconded by Mrs F Gell THAT the Minutes of Meeting *2/83 be approved CARRIED PROGRESS REPORT - J C Mather informed the Board that there will be an official opening of the Bolton Flood Control Channel following the Authority Meeting on Friday, October 14, 1983. The Minister of Natural Resources will tour the area by helicopter before lunch, and after lunch, he will participate in the opening Members will be receiving a formal invitation in the mail A progress Report was then made in the form of a slide presentation Two members of the Advisory Board had to leave at this point, and, lacking a quorum, the meeting adjourned J S Scott W.A McLean Chalrman Actlng General Manager em 1983.09 13 ~ C-24 , the metropolitan toronto and region conservation authority minutes FLOOD CONTROL AND WATER CONSERVATION ADVISORY BOARD 27-0CTOBER-1983 #4/83 The Flood Control and Water Conservation Advisory Board met at the Authority Office, 5 Shoreham Drive, Downsview, on Thursday, 27 October, 1983. PRESENT Chairmq,n J.S Scott Vice-Chairman W R. Herridge, Q.C Members Mrs F E. Gardner W J Kelly L Martin J Witty Authority Chairman Mrs F E. Gell Commissioner of Works, The Mcy of Metropolitan Toronto F J Horgan ABSENT Members R J Crowe J. Davidson Prof R L James E. King F.J McKechnie Mrs M Prins100 Mrs N. Stoner This special meeting of the Board was convened at the request of members at Authority Meeting #5/83, held 14 October, 1983, to discuss the following item BRIEF TO THE FLOOD PLAIN REVIEW COMMITTEE OF THE PROVINCE OF ONTARIO J C Mather, Administrator, Water Resource Division, informed the Board that the above committee was established by Order-in-Council of the Government of the Province of Ontario to conduct a public review of flood plain management in Ontario The Authority's brief is supplementary to a verbal presentation made at the afternoon session of the public meeting held 3 October, 1983, at the Toronto Airport Hilton hotel The deadline for submission of written briefs is 31 October, 1983 Following considerable discussion, it was agreed that the concerns expressed by members would be considered in amending the brief for presentation to the Flood Plain Review Committee. Res #10 Moved by J. Witty Seconded by W.R Herridge THAT the "Brief to the Flood Plain Review Committee of the Province of Ontario", prepared by The Metropolitan Toronto and Region Conservation Authority, and dated October 1983, be forwarded to the Flood Plain Review Committee, together with a covering letter which would address some of the concerns mentioned by the Flood Control and Water Conservation Advisory Board at its meeting held 27 October, 1983, AND FURTHER THAT the Committee be requested to provide an opportunity for oral presentation of the Brief CARRIED UNANIMOUSLY C-25 -2- Mr. Mather informed the Board that the support for the Authority's position received from the Regional and local municipalities was very encouraging TERMINATION On motion, the meeting terminated at 3:30 p m , 27 October, 1983 .. - J S Scott J C Mather Chairman Administrator, Water Resource Division KC. ~ C-26 V the metropolitan toronto and region conservation authority minutes FLOOD CONTROL AND WATER CONSERVATION ADVISORY BOARD 16-DECEMBER-1983 #5/83 The Flood Control and Water Conservation Advisory Board met at the Authority Office, 5 Shoreham Drive, Downsview, on Friday, 16 December, 1983 PRESENT Chairman J.S. Scott Vice-Chairman W R. Herridge, Q C Members R J Crowe James Davidson Mrs F E. Gardner Prof R L James , W J Kelly L Martin F J McKechnie Mrs M Prinsloo Mrs N Stoner James Witty Author~ty Vice-Chairman E V Kolb ABSENT Member E King MI~UTES Res #11 Moved by Mrs N Stoner Seconded by Mrs M Pr~nsloo THAT the "Iinutes of Meet~ngs #3 and #4 be approved CARRIED PROGRESS REPORTS J C Mather Admin~strator, Water Resource Division, briefly reviewed the following Authority brief subm~tted to Flood Plain Review Committee awaiting report of Comm~ttee Project for Flood Protection Dykes, Duffin Creek proJect approved by this Board in March, 1983 Awaiting approval by municipalities of Pickering and Ajax Goodwood Pumping Station proJect awaiting approval by Region of Durham R Ii Dewell, Maintenance & Operat~ons Supervisor, Flood Control Section, made a slide 9resentation on the following sites Metro Eros~on Program Work at Wynford Heights Drive, City of North York (Don River watershed) was completed in the early summer Erosion control remedial works were carried out at #12-42 Delroy Drive and #47-51 Berl Avenue, City of Etobicoke (Mim~co Creek watershed) The main portion of the works has been completed, although restoration and re-vegetation must be carried out ~n the spring of 1984 Erosion control remedial work completed at #12-32 Beaucourt Road, C~ty of Etob~coke (M~mico Creek watershed) York Region Erosion Proaram Eros~on control remedial work completed on the Kirby Sideroad, Town of Vaughan (Humber River watershed) C-27 -2- Peel Region Erosion Program ErosJ.on control remedial works were started and have been completed at Glasgow Road, Village of Bolton (Humber River watershed) Bolton Flood Control Works Restoration of the King Street bridge in Bolton completed, although minor restoration will be required in the spring of 1984 This construction completes the last component of the overall Bolton project commenced in September, 1982 Highland Creek Project Remedial work at two sites identified under the 1983 project completed in October, 1983 C 0 E D Remedial works were completed at Azalea Court, City of North York (Humber River watershed) , and at Lakeshore Boulevard, City of Etobicoke (Etobicoke Creek wa ter shed) , under Bank Stability Hazard Removal Project COED staff continue to work wJ.th Authority staff on approved erosion projects PROJECT FOR THE DREDGING OF THE KEATING CHANNEL, DON RIVER, 1984-1985 Res #12 Moved by Mrs N Stoner Seconded by F J McKechnie THE BOARD RECOMMENDS THAT the Project for the Dredging of the Keating Channel, Don RJ.vEir, 1984-1985, as appended as Schedule IIAIl of these Minutes, be approved, AND FURTHER THAT the following action be taken 1 The Municipality of Metropolitan Toronto be designated as the benefiting municipality on the basis set forth within the proJect, 2 The Government of the Province of Ontario be requested to approve the project and a grant of 55% of the cost thereof 3 Pursuant to Section 24 of the Conservation AuthoritJ.es Act, approval of the Ontario MunJ.cipal Board be requested, 4 Implementation of the project be conditional upon the other participants - The Toronto Harbour Commissioners and the Federal Government - approving their share of the funding 5 When approved, the approprJ.ate Authority officials be authorized to take whatever action J.S requJ.red J.n connection with the project, J.ncluding the execution of any documents CARRIED PROJECT FOR CHANNEL IMPROVEMENTS ON THE EAST & WEST BRANCHES OF THE HIGHLAND CREEK, 1984-1986 Res #13 Moved by Mrs M Prinsloo Seconded by Mrs N Stoner THE BOARD RECOMMENDS THAT the Project for Channel Improvements on the East and West Branches of the Highland Creek, 1984-1986, as appended as Schedule tlB" of these MJ.nutes, be approved, AND FURTHER THAT the following action be taken 1 The Municipality of Metropolitan Toronto be designated as the benefiting munJ.cipality on the basJ.s set forth J.n the project, 2 The Government of the Province of Ontario be requested to approve the proJect and a grant of 55% of the cost thereof, 3 Pursuant to Section 24 of the Conservation AuthorJ.ties Act, approval of the Ontario Municipal Board be requested 4 When approved the approprJ.ate Authority officials be authorized to take whatever action is required in connection WJ.th the project, including the execution of any documents CARRIED - -3- C-28 SLIDE PRESE~TATION Messrs D Dyce and P Wigham presented the 'Conservation Land Management Program' slide presentation which has been shown on cable television, and represents an interview with a private land-owner who has received conservation assistance from the Authority While the Conservation Assistance programs are designed for private land-owners in the headwaters areas of the watershed, there are benefits in overall watershed management TERMINATION On motion, the meeting was terminated at 12 15 P m , 16 December, 1983 J S Scott W A McLean Cha~rman Acting General Manager KC , , C-29 SCHEDULE "A" THE METROPOLITAN TORONTO AND REGION CONSERVATION AUTHORITY "PROJECT FOR THE DREDGING OF THE KEATING CHANNEL DON RIVER, 1984 - 1985" . ~ DECEMBER, 19R3 C-30 CONTENTS . I PURPOSE OF THE PROJECT II LOCATION AND DESCRIPTION III COSTS AND FINANCING !V AGREEMENTS ; C-31 PURPOSE The purpose of this project is to. permit the Metropolitan Toronto and Region Conservation Authority to exercise the powers afforded by the Conservation Authorities Act R S 0 1970, Chap 78 as amended to establish and undertake in the area over which it has jurisdiction, a program designed to further the conservation, restoration, development and management of natural resources in accordance with the Flood Control Program of the Watershed Plan The purpose of this project is to meet one of the defined objectives of the Flood Control Program which is to provide in defined flood damage centres, on a priority basis, protection that will reduce the risk of flooding to less than 50% over the life (l00 years) of the affected structure(s\ Protection to a higher level wi 11 be provided if economically and/or socially justified Through this project, the Metropolitan Toronto and Region Conservation Author ity will provide part of the funding for the first two years of a six year project required to dredge the Keating Channel at the mouth of the Don River The dredging is required to minimize the potential flood hazard, reduce pollution of the Inner Harbour, and maintain the northeast corner of the harbour for shipping This project will be undertaken in accordance with the requirements of the Environmental assessment Act C-32 LOCATION AND DESCRIPTION The Keating Channel Environmental Assessment provides a complete description of the work proposed in this project The following is a brief description of the principle components of the problem and the proposed solution The Keating Channel is the man made mouth of the Don R i v e r wh ere it empties into the northeast corner of Toronto's Inner Harbour Each year about 50,000 cubic meters (m ) of sediment are deposited by the Don River into the Keating Channel Along with the sediment comes pollutants, which are derived throughout the watershed and adhere to the fine grained sediment which is deposited in the Channel or carried out into the Harbour The deposition of this material within the Keating Channel and the northeast corner of the Inn~r Harbour makes these areas virtually unusable for shipping unless regular maintenance dredging is performed This same siltation restricts the flow of flood waters and thus greatly increases the potential for flood ing particularly as a result of ice jams When dredged, the Keating Channel !cted as an effective sedimentation trap but now sediments flow into the !iarbour and must be removed annually to preserve boat access to commercial docks In 1972, Canada and the United States signed a joint agreement to improve water quality in the Great Lakes system One important result was a complete ban on the open water disposal of polluted dredgeate nntil 1974 the Toronto Harbour Commissioners were able to dispose of the polluted dredgeate in a reasonably economic fashion, the method IJsed at the time was to bury the material under the advancing fill at the Outer Harbour Headland However, as a result of the ban on open water dumping, the dredging was discontinued principally because of the high cost of any acceptable alternatives for disposal In 1Q"'9, plans for a confined disposal area at the Outer Harbour Headland were implemented This facility has been used to a limited extent for the disposal of material dredged for navigation purposes since 1981 C-33 Since halting the dredging operations, approximately 400,000 cubic meters of sediment have collected within the Keating Channel Area This Authority through "The Interim Water and Related Land Management Project 1979 - 1981 for the Dredging of the Keating Channel, Don River" supported works undertaken by the Toronto Harbour Commissioners in an initial dredging project Wh il e some dredging was undertaken through th is project, a significant quantity of sediment remains within the Keating Channel pending the results of the Envir'Onmental Assessment A revised dredging program has been established proposing a six year effort to complete the necessary dredging works This Project outlines the involvement of the Authority over the first two years of the six year project A subsequent project will be developed to complete the work following receipt of the final decision on the Environmental Assessment The dredging being proposed will be undertaken by crews and equipment of the Toronto Harbour Commissioners The sediment removed from the Keating Channel will be placed into bottom dumping scows and towed to the disposal facility at the Outer Harbour Headland It should be noted that following the six year project required to fully dredge the Keating Channel area, maintenance dredging will still remain a requirement to ensure the fulfillment of the objectives met through the dredging project C-34 COST AND FINANCING The costs associated with this two year project include Legal and survey fees, land acquisition, engineering and environmental studies, labour, equipment and material costs associated with the dredging and material disposal, all costs incurred in relation to the Environmental Assessment Act approval requirements COSTS The cost for the dredging project will be apportioned between, the Toronto Harbour Commissioners, The Government of Canada and The Metropolitan Toronto and Region Conservation Authority, with each agency responsible for one third of the project costs The cost apportionment allocat~d to The Metropolitan Toronto and Region Conservation Authority for its two year project is J;150,000 per annum or a total cost of $700,000 FINANCING It is proposed that the funds required for this project be raised on the basis of a 55~ grant from the Province of Ontario and 451, from the Municipality of Metropolitan Toronto as benefitting municipality 1984 1935 Province of Ontario d.i192,500 <1;192,500 Municipality of ~etropolitan d.i157,500 $157,500 Toronto TOTAL <lj350,OOO d.i350,OOO C-35 AGREEMENTS In undertaking this Project, the Authority will be entering into a three party agreement where the costs shall be apportioned on an equal basis The other parties involved being the Toronto Commissioners and the Federal Government through Transport Canada N 't~ -- LESLIE STREET SPIT PROPOSED TORONTO INNER TORONTO DISPOSAL AREA H ARBOUR OUTER HARBOUR - CELL No.1 -CELL No 2 0 :'00 t= 1000 - CEll No.3 NfTRES 1 ~ I fiG I ~ lIw melropollaan lorooto alld COt . . legIOn l:itllVallOll authorltV GEN;~::';A~;;;;~~T s:~:: WIR I 3./ . - "Ie - - . ....., \ -, t - . - -.. -~ , 1 - lj . - \ . t . ~ . -. - .- , t -, .x #\~ ,- -.. ~ <. !......-~~.... ...... , ~ \;.,~ "''\1: :... ;: ...... 1'"..... ...... ~ .. ..,r-t;-4; ~: ". 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JANUARY 26, 1978. C-39 SCHEDULE "B" THE METROPOLITAN TORONTO AND REGION CONSERVATION AUTHORITY , "A PROJECT FOR CHANNEL IMPROVEMENTS ON THE EAST AND WEST BRANCHES OF H1GHLAND CREEK" 19R4-1986 AUGUST, 1983 C-40 CONTENTS I PURPOSE OF PROJECT II LOCATION AND DESCRIPTION III COSTS AND FINANCING IV AUTHORITY APPROVALS AND REQUESTS V LAND VAUES lJI AGREEMENTS VII APPENDIX (i) Technical data sheets, cost benefit analysis sheets and site plans for the 1984, 1985, 1986 work sites listed below 1984 1 MB 12050 2 MAL 10230 3 MB 11150 4 MB 11050 5 MB 11310 6 HB 11130 7 MB 11330 3 MB 11550 1935 1 EB 9100 2 \1B 8400 3 liB 8830 4 WB 8900 5 WB 9270 1986 (See Site Location Map for lq86) 1 EB 10350 EB 1 ES 2 EB 3 SB 4 EEl 5 C-41 - 1 - I PURPOSE OF PROJECT The purpose of this project is to enable The Metropolitan Toronto and Region Conservation Authority ~o continue to carry out channel improvements on the East Branch of the Highland Creek and further to extend remedial works to the West Branch between Lawrence Avenue and the Scarborough Golf Course The project covers a three year period from 1984-1986 The goal of the Authority through this project is to minimize the hazards of erosion to life and property on the Highland Creek Watershed in the Municipality of Metropolitan Toronto and is a continuation of the work initially undertaken in the "Projects for Channel Improvements on the East Branch of Highland Creek 1982 and 1983" To achieve its goal the Authority has defined the following objectives ( a) to implement a program of site specific remedial works based on a priority ranking of sites as defined and outlined in the 'Preliminary Engineering Study on Erosion Control, East Branch - Highland Creek' , (b) to recognize the importance of the natural valley character in the design of remedial works wherever feasible ~ This project will be carried out in accordance with the requirements of the Environmental Assessment Act and addressed in the 'Class Environmental Assessment for Erosion and Sediment Control' C-42 - 'Z - II LOCATION AND DESCRIPTION Significant erosion has been occurring during both high flow and low flow periods along the unprotected East Branch of the Highland Creek and an unprotected section of the West Branch between Lawrence Avenue and Scarborough Golf Course as illustrated by the shaded area on Figure 1 The very active erosion which is apparent through these sections is caused by a combination of the following ( i) the marginally stable slopes left as a result of the major floods in August of 1976, (i i) high flow veloc it ies , (iii) the erosion susceptible soils which make up the channel and valley walls; ( i v) the highly urbanized character of most of the watershed which leads to increases in peak flows, velocities and frequency of flooding The erosion of the stream bank and, in some instances, the valley wall is having an impact on the terrestrial communities and has resulted in the loss of large wooded areas The potential also exists for the activity to eventually subject a significant number of residences to a potential hazard The existing erosion is affecting municipal services and existing hydraulic structures located in the floodplain, 3nd restricts the use of valley land for park purposes as seen in the attached photographs Tn response to concerns expressed by The Metropolitan Toronto and Region Conservation Authority, the Borough of Scarborough, the Metropolitan Toronto Parks and Property Department and Metropolitan Toronto Works Department, the fir~ of Cumming-Cockburn and Associates Llmited was authorized by the Conservation Authority to undertake a study to identify the most serious erosion areas and to develop a long-ter~ program for mitigating problems associated with erosion along the study area The reach of Highland Creek to be analyzed for eros ion problems included ltiest Branch - from Lawrence Avenue upstream 1 km East Branch - From confluence with West Branch to the confluence with the Mal vern Branch 4alvern Branch - From its confluence with the East 8ranch to Highway 401 ;1arkham Branch - From its confluence with the Malvern Branch to the Scarborough Channel The consultants have recommended that the most feasible course of action to solve the erOSlon problem within the study area would be to carry out remedial works on a high hazard site specific basis The advantages for carrying out works in this manner include, maximum benefit for capital expenditure , expediency in resolving erosion problems and the capability of focussing the construction activity in the areas of 'lighest priority first In order to determine the order of priority for future works, an inventory of erosion sites was carried out and a weighting system was developed to rank the sites The weighting system developed, assessed such parameters as (i) existing and future potential for lateral movement of the stream bank, (it ) proximity of structures to the erosion problem, di1) environmental significance of the area, ( i v) rate of erosion, (v) soil characteristics of the effected bank, l..-4j -- \ PROJECT FOR CHANNEL IMPROVEMENTS ON THE EAST a WEST BRANCHES OF HIGHLAND CREEK I '" , tIWY 401 ~ ~ ~ ; (Ii ~ ~ C,N.R, 111111111111 AREAS OF S1GNIFICA~T EROSION FIG. 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"'-'" "- EROSION ON THE MARKHAM BRANCH OF THE EAST HIGHLAND CREEK Notice both the coincident valley wall erosion which is encroaching into useable tableland areas and also the extensive riverbank erosion. I ~ -...] ~,~ ' " \tI ) " Index Key ~~ HuM. A... 00_ Ch.lnage WI IDetr~a ("-' O.OC? e. L.... Ontario) . W.IItfI;OU'" Abbrevl&t--. PlTA PrIOlIIW lilt .........""' .;; Abbr.v~hon Key MAL ".I..rn l!kanch M8 IIbrlltl.aln Iha.nc:h Ea .... .. 00<h wa Wont a..nch MS12250PLTB puA St.bot.lt'f' ~ ERVlfOfVnent.. ' t;""'"" PLTa S4l1biUl'f' pIua Huard WB8900 Pi.. T A ' ' , / . ''', , i WB9270PLTA I I ....,opo.lI... TOfOlltO -..d Re9'OfI eon-..._ Aut-.wlt, I Cumming .eoc.......n , Anoelal.. llmlted . I A P'.klntrwlr, E~"'1nQ Study on EI~~ Control 'Of "" 0 "" WI Stanch HoghlMld e._ Sc'" 1m' Plan of Erosion Sensitive Areas Site 2 I Figure C-48 - g - Figure 2 indicates the location of the sites inventoried and identified in the report Table I lists in order the top ten sites determined to be the most serious or hazardous of the sites inventoried As a result of the number of sites inventoried, the Authority is proposing to apportion the remedial works required over a three ( 3) year period The proposed remedial works for the most part will be carried out on a priority basis established by the consultants However in order to minimize the disturbance and the environmental effects of the construction to the areas and further to "maximize the use of our access roads and work yards; some of the lesser ranking sites will be worked on during the same time as the high priority sites if they are in the same area Erosion protection remedial works for the priority sites where structures are affected must be tailored to suit the particular conditions at each location To stabilize these areas, alternative forms of protection and materials were evaluated in order to select the most appropriate and economically viable solution The preliminary designs developed by the consultants will be fine tuned by Authority staff for implementation in the field A standard design approach has been developed where previous development or structures are not as yet affected but where significant amount of erosion is still occurring An example of a tJpical design solution for this type of problem is shown in Figure 3, while following is a description of this solution ( i) Regrading of affected bank to a minimum 2 1 slope, ( i i) Placement of ~ 400 mm thick well graded granular base (or and equivalent filter cloth); (l11 ) Placement of an average 450-550 mm layer of rip rap protection, ( i v) Placement of rip rap protection to a minimum height of ~wo metres above the existing invert This would provide complete toe protection for the annual runoff event (v) Extend rip rap protection upstream to where the existing channel is stable If the rip rap cannot be tied in to a stable section, a rock cut-off wall should be constructed Attached in the appendices are location plans, technical data sheets and cost/benefit analysis sheets for all of the sites being considered for remedial Norks under this project Following is the proposed work program for the 3 year project, which lists the site and the project.ed work year I .c;:.. ~ TYPICAL CHANNEL SECTION EXISTING PROFILE 250mm - 600mm RIP RAP \l ~ GRADE TO 3H IV AND SOD I I CLEAN OUT GRANULAR A BACKFILL 270R TERRAFIX FILTER - - - - 10 - C-50 PROPOSED WORK PROGRAM FOR HIGHLAND CREEK 10!l4 1 MB 12050 HIGHLAND CREEK I/A4 2 MAL 102Vl 3 MB 111<;0 4 MB 11050 'i ME 11310 HIGHLAND CREEK TT/qU 6 MB 111~0 7 M13 ln30 fl t~B 11'i<;0 10Q<; 1 r:B 9100 2 ',.[B q40n < WB Rqir) 4 WE Rgon <; WB 0270 1qQli (See Site Location Map for 10A6) - 1 ER 10<50 S13 1 ".:B 2 EP. i E~ 11 E:l 5 C-51 - 11 - TABLE I SUMMARY OF HIGH PRIORITY SITES PRIORITY SITE (STATION) 1 MAL 10230 2 MB 12050 3 WB 8830 4 MB 12300 5 MB 11310 6 WB 9270 7 EB 8500 3 WB 13900 9 EB 8870 10 MB 11550 NOTE Refer to Figure 2 for location of High Priority Sites C-52 - 12 - III COSTS AND FINANCING The expenditures required to implement this project are based on the best information currently available for works to be undertaken The costs stated shall be understood to include legal and survey fees, engineering and geotechnical studies, site supervision and all materials, labour, equipment, etc associated with the construction The proposed allocation of funding for these works on an annual basis is as follows COSTS YEAR 1984 1985 1986 TOTAL $540,000 $350rOOO $350,000 FINANCING The total cost of the three year project is $1,240,000 and the yearly costs will be funded as follows 1984 Authority - $243,000 Province of Ontario - $297,000 Total Annual Cost 'S5lJO,000 1985 Authority - $157,50,0 Province of Ontario - $192,500 Total Annual Cost 'S350,000 1986 Authority - ~157,500 Province of Ontartio - ~192,500 Total Annual Cost ~350,OOO The ~unicipality of Metropolitan Toronto is designated as the benefiting municipality to raise ~he Authority's share of the work C-53 - 13 - IV AUTHORITY APPROVALS AND REQUESTS Author ity Mot ion - .. Letter to Metro Metro's Approval Letter to Minister . - .