Silver Valley Sewer Master Plan Development

Water Street was retained to update the sanitary sewer servicing plan for the City of Maple Ridge’s Silver Valley Area.  The City of Maple Ridge required an update of its existing planning for the area considering proposed imminent developments in the area as well as the developments to date.

The Silver Valley area has a gross area of 581 ha, and a current serviced population of 5,990 (2016 census) with planned growth to over 15,339.  The area also has a significant elevations range (from 10m to 170 m), requiring multiple pressure zones for water servicing.

The work included updating the existing and build-out sewer model as per development to date and land use planning for the area. Demand assignments were based on the OCP zoning densities and calculated PWWF and RDII loads. Modelling and analysis were completed using Bentley SewerCAD v10.02.02.04.and ESRI ArcGIS software platforms.

The updated supply arrangement developed by Water Street:

• Reviewed existing sanitary sewer loads and rainfall data to forecast demands for build-out
• Assessed sizing of the existing facilities (current sewers and lift stations) and sized upgrades as required
• Development of actual and design rates for base sanitary flows, groundwater infiltration (GWI), and rainfall derived inflow and infiltration (RDII)
• Flow testing and rating of existing pump stations
• Recommended configuration and sizing for new sewers and lift stations
• Addressed system redundancy

Recommended a revised servicing strategy and capital plan