This 25 unit townhouse development was situated on a steep embankment with forested ravines on each side of the development which presented unique grading and storm water control challenges. The design solution involved heavy storm event flows being diverted to a large trunk main sewer. Off-site design included multiple road alignment options.
Services: Construction Layouts
H.Y. Engineering has been involved with this project from feasibility to completion. The H.Y.E. Planning Department provided our Client with a feasibility study and preliminary cost analysis for the property. Planning services included liaison with the City and neighbouring property owners/developers to establish maximum development potential and cost savings opportunities beneficial to all parties.
Once the subdivision was approved, H.Y. Engineering provided subdivision layout and off-site design, project management services, construction services, Erosion and Sediment Control (ESC) design and monitoring, and inspection services. The designs illustrated a storm water management plan, lot grading and infiltration gallery details, sanitary main extension and connections, watermain extension and connections, and significant roadworks design including the upgrades of the existing 64th Avenue arterial road, the extension and completion of the 64A Avenue collector road, and a lane to be constructed behind the development all with required sidewalks, curbs, gutters, and streetlighting.
This project began with the analysis of the existing storm and sanitary sewer capacities within a 2 ha. catchment around the proposed development. The sewers were assessed in both the context of the existing land-use with the proposed development, as well as with the catchment developed to the ultimate O.C.P. density. H.Y. Engineering provided the City of Richmond with recommendations for upgrades to the existing storm system for this proposed development and future developments within the catchment. Once the recommendations were adopted by the City and the requirements for the development established, H.Y. Engineering provided off-site and on-site design services for the project. The on-site designs involved turning analyses and included the service locations and connections, road grading and drainage details, turning analyses, curb and driveway details. Off-site designs included roadworks drawings illustrating the upgrades required along Hazelbridge Way and Leslie Road with streetlights and street trees, and designs for storm and sanitary sewer upgrades with connections.
H.Y. Engineering was retained as prime consultant to survey, design, manage, tender, and inspect this extensive 293 single-family lot subdivision in the Yorkson neighbourhood of Langley, BC. The on-site design requirements include the full layout and design of multiple roadways, lanes, and cul-de-sacs with curbs, bulges, gutters, sidewalks, cross sections, street lighting, and temporary roads as required. The design of a storm water management system involved using storm water modeling, flow calculations, the design aquatic habitat features, coordination for the design of rain gardens, and the assessment and coordination of existing detention ponds for expansion as required. Water connections from 80th Avenue were designed with calculations to ensure adequate flows. Storm sewer and sanitary sewer plans illustrated the extension of the trunk mains from the intersection of 81A Avenue and 212th Street to the intersection of 80th Avenue and 212th street.
The project further involved significant coordination with the Township of Langley for input and approvals on designs as well as for the preparation of latecomer agreements. Erosion and Sediment Control design was prepared and monitored by H.Y. Engineering as well as construction inspection with reports to the Township of Langley.
H.Y. Engineering Ltd. was involved with this project from initiation to completion including planning services to coordinate the rezoning and subdivision of the property with the City, and preliminary design of the subdivision layout and servicing concepts and alternatives. On-site and off-site design services included lot grading design, stormwater control plans, site servicing, roadworks with bus bay, and complex retaining walls. Erosion and Sediment Control (ESC) design, ESC monitoring, and construction inspection services were also provided for this project.