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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.

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Project Profile - Water Resources
VALDOR ENGINEERING INC.
Consulting Engineers & Project Managers

Valdor Engineering Inc. was retained by the City of Burlington to complete the detailed design and construction supervision for a culvert replacement and naturalization along a reach of Rambo Creek near Highway 407.  Project tasks included the culvert upgrade, restoration/naturalization of a reach between Cavendish Drive and Hwy 407 and the inclusion of a high capacity inlet grate/trash rack, geotechnical investigations including global stability analysis of proposed armourstone retaining walls, geomorphic investigations, aquatic and wildlife habitat assessments, hydraulic assessment, detailed design, agency approvals, and contract administration and construction services.  The proposed 

Rambo Creek Culvert Replacement / Creek Naturalization / Slope Stabilization, Detailed Design, Burlington, Ontario

Client: City of Burlington

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Valdor Engineering Inc. was retained by the City of Burlington to complete the detailed design and construction supervision for a culvert replacement and naturalization along a reach of Rambo Creek near Highway 407.  Project tasks included the culvert upgrade, restoration/naturalization of a reach between Cavendish Drive and Hwy 407 and the inclusion of a high capacity inlet grate/trash rack, geotechnical investigations including global stability analysis of proposed armourstone retaining walls, geomorphic investigations, aquatic and wildlife habitat assessments, hydraulic assessment, detailed design, agency approvals, and contract administration and construction services.  The proposed 

precast box culvert size of 4270 x 2200 mm (opening size) was selected based on the recommendations of the EA report to achieve the required minimum MTO design criteria (0.3m of freeboard in the 10-yr storm) for a local road (Cavendish Drive).  The proposed design can convey the 50-yr event with at least 0.30m of freeboard and the 100-yr event without overtopping, which exceeds the MTO criteria.  Downstream of Cavendish Drive, the existing concrete block retaining walls were removed and replaced with armourstone on the south side and armourstone with bioengineering at 2:1 (H:V) on the north side of the creek.  The proposed channel design incorporated geomorphological features including a step-pool system, riffles, riverstone erosion protection and ties in with the existing channel upstream of the 407 culvert inlet.

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Project Profile - Water Resources
VALDOR ENGINEERING INC.
Consulting Engineers & Project Managers
VALDOR
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