Package B – Detention Tank For Lots 401–500 m²

Lot Size (m²) Active Storage (L) Orifice Size (mm) Subsurface Suitable? Backwater Valve? Trap? Tank 400 - 500 Meets 3900L Requirement 35 ✅ Yes ✅ Yes ❌No Norwesco Low Profile Includes: Norwesco Low Profile Tank + 35 mm Orifice Plate + Overflow Kit + Backwater Valve. Sewer Gas Trap to be external to the tank and to be supplied by others Ideal for mid-size residential lots, this 3,900L system provides compliant active storage for stormwater detention in Vancouver’s Small Site Pathway. With durable construction, easy access ports, and integrated flow control, this package takes the guesswork out of permit-ready installation.