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Yonge and Elgin Mills Flood Mitigation Municipal Class EA, Town of Richmond Hill, Ontario

Client: Town of Richmond Hill

The Town of Richmond Hill retained the services of Valdor Engineering to complete a study following the Municipal Class Environmental Assessment (EA) process (Schedule B) to investigate and evaluate the options for flood mitigation to improve the level of protection within a flood vulnerable area located in the vicinity of the Yonge Street corridor between Elgin Mills Road and Levendale Road.  The watercourse that traverses the flood vulnerable area is known as German Mills Creek and it tributary to the Don River. The primarily industrial area lies within the Regional floodplain and, as such, the future development of this area is severely restricted. As per the Preliminary Flood Remediation Study, 

Yonge Street Corridor (Adjacent German Mills Creek) Between Elgin Mills Road and Levendale Road (Valdor, October 2013), a long list of potential flood mitigation options were reviewed and a short list of options that achieve a substantial reduction in the extent of the Regional floodplain were identified for further review and consideration.  The purpose of this study was to further evaluate the short list of feasible flood remediation alternatives and, following the Class EA process, identify a preferred alternative for improvements to the existing municipal and/or private conveyance system to remediate Regional flooding within this flood vulnerable area.   Due to the wide, shallow urbanized floodplain, previous efforts to model the flooding using HEC-RAS were unsuccessful and it was determined that a 2-D hydraulic model was required to accurately characterize the extent of flooding.  All hydraulic analyses were completed using Mike Flood (coupled M11 and M21) in conjunction with ArcGIS.  The preferred alternative was identified in consultation with the Town, TRCA, other agencies and stakeholders through public consultation.  The study outlined an implementation and phasing strategy for the preferred alternative and included the preparation of preliminary engineering design drawings and detailed construction cost estimates.

DWG 6.1-4_Preliminary Design Plan zoomed
Fig 3.2_Roughness_Map -11x17_sc10000-05A
Fig 3.8_Comparison of Flood Depth vs Ex
Fig 1.3_Mun Class EA Process.jpg
Project Profile - Water Resources
VALDOR ENGINEERING INC.
Consulting Engineers & Project Managers
VALDOR

Massey Creek Flood Reduction Study, Feasibility and Analysis, EA and Detailed Design, Cobourg, Ontario

Client: Town of Cobourg and GRCA

The Town of Cobourg under the direction of the Ganaraska Region Conservation Authority (GRCA), retained Valdor Engineering to complete an engineering analysis to determine the feasibility and cost viability of extending an existing flood diversion channel to King Road as a flood reduction measure in order to maximize the extent of developable land within the Lucas Point Industrial Park.  Deliverables included an EA report, public meetings, cost-benefit analysis, detailed engineering drawings for construction and detailed construction cost estimate.  The project was completed following the Municipal Class EA Process (Schedule ‘B’).  The preferred option included a diversion channel, a flow control structure and a cross-over structure. The proposed diversion channel starts

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immediately downstream of King Street and connects with the existing diversion channel upstream of Normar Road.  The proposed diversion channel is approximately 900 m long including a 150 m long collector ditch.  The diversion channel has a typical bottom width of 18 m, a side slopes of 3:1 (H:V), and a top width of approximately 27 m.  The bottom of the diversion channel ties into the existing creek at the upstream end at King Street and to the existing diversion channel at the downstream end near Normar Road.  The diversion channel is designed to convey and contain flows from events greater than approximately the 2-yr up to the Regional event thereby reducing the existing floodplain within the Lucas Point Business and Industrial Park. Flow less than or equal to approximately the 2-yr storm flow will be conveyed through Massey creek.  A crossover structure was designed within the existing diversion channel downstream to convey flow from the existing creek across the diversion channel.  A portion of the existing creek is to be realigned in the vicinity of the proposed crossover structure. The proposed flow target for Massey Creek in the vicinity of the diversion channel was confirmed through geomorphic assessment and optimized as required.

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King Street East4 (2).jpg
Driveway culvert ds of King Road1.jpg
Massey ds of driveway culvert ds of King
Project Profile - Water Resources
VALDOR ENGINEERING INC.
Consulting Engineers & Project Managers
VALDOR
Valdor 1992 Logo.JPG

Fenelon Falls Drainage Study, EA, Detailed Design and Construction Services, Fenelon Falls, City of Kawartha Lakes, Ontario

Client: City of Kawartha Lakes

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Valdor Engineering Inc. was retained by the City of Kawartha Lakes to prepare a drainage study and to make recommendations for a drainage outlet for the proposed new arena and community centre as well as other development considerations located in the Village of Fenelon Falls (Basin DD) adjacent the Trent-Severn Waterway.  The purpose of the study was to prepare a conceptual drainage outlet to accommodate the identified future development areas without exacerbating the existing flooding problems within Basin DD.  Included in the study was a detailed storm sewer survey and hydraulic analysis (HGL) to evaluate existing flow capacity of the storm sewer system and flood plain

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modelling to assess the extent of flooding throughout the drainage basin.  Surveys and hydraulic calculations were also completed to determine the rating curve for an identified flow split area where flow was noted to spill to an adjacent catchment.  The successful completion of the project and endorsement by City Council of the recommended mitigation plan followed the Municipal Class EA

process (Schedule B). A subsequent contract was awarded to Valdor for the detailed design and contract administration for the North Street storm sewer and road re-construction including the outfall at the base of the falls.

Project Profile - Water Resources
VALDOR ENGINEERING INC.
Consulting Engineers & Project Managers
VALDOR
Valdor 1992 Logo.JPG
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Yonge and Elgin Mills Flood Mitigation Municipal Class EA, Town of Richmond Hill, Ontario

Client: Town of Richmond Hill

The Town of Richmond Hill retained the services of Valdor Engineering to complete a study following the Municipal Class Environmental Assessment (EA) process (Schedule B) to investigate and evaluate the options for flood mitigation to improve the level of protection within a flood vulnerable area located in the vicinity of the Yonge Street corridor between Elgin Mills Road and Levendale Road.  The watercourse that traverses the flood vulnerable area is known as German Mills Creek and it tributary to the Don River. The primarily industrial area lies within the Regional floodplain and, as such, the future development of this area is severely restricted. As per the Preliminary Flood Remediation Study, 

Yonge Street Corridor (Adjacent German Mills Creek) Between Elgin Mills Road and Levendale Road (Valdor, October 2013), a long list of potential flood mitigation options were reviewed and a short list of options that achieve a substantial reduction in the extent of the Regional floodplain were identified for further review and consideration.  The purpose of this study was to further evaluate the short list of feasible flood remediation alternatives and, following the Class EA process, identify a preferred alternative for improvements to the existing municipal and/or private conveyance system to remediate Regional flooding within this flood vulnerable area.   Due to the wide, shallow urbanized floodplain, previous efforts to model the flooding using HEC-RAS were unsuccessful and it was determined that a 2-D hydraulic model was required to accurately characterize the extent of flooding.  All hydraulic analyses were completed using Mike Flood (coupled M11 and M21) in conjunction with ArcGIS.  The preferred alternative was identified in consultation with the Town, TRCA, other agencies and stakeholders through public consultation.  The study outlined an implementation and phasing strategy for the preferred alternative and included the preparation of preliminary engineering design drawings and detailed construction cost estimates.

DWG 6.1-4_Preliminary Design Plan zoomed
Fig 3.2_Roughness_Map -11x17_sc10000-05A
Fig 3.8_Comparison of Flood Depth vs Ex
Fig 1.3_Mun Class EA Process.jpg
Project Profile - Water Resources
VALDOR ENGINEERING INC.
Consulting Engineers & Project Managers
VALDOR
Valdor 1992 Logo.JPG