Solution

To satisfy LEED certification requirements, the developers integrated a rainwater harvesting and reuse system in this building to reduce demand on municipal water supply and the impact of storm runoff. Rainwater is collected from a hard rooftop area and treated to supply toilet flushing for the entire building.

Net Zero Water worked with Integral Group Engineering of Vancouver and PML Professional Mechanical Ltd. of Port Coquitlam BC, to design a turn-key rainwater harvesting treatment system.

Rainwater goes through Net Zero Water’s rainwater treatment package system after being pulled from the poured concrete cistern. Treated is then stored in a 2,000 US gallon day tank before going through a booster package to get to the top of the building.

To have the NZW package comply, the engineering team added an online turbidimeter to always record the turbidity level of the water. Net Zero Water provided concepts, options, drawings and written specifications until the final design was agreed upon.

The Net Zero Water treatment system was designed to be compact, configured for ease of maintenance, skid mounted and complete with stainless steel pipe and fittings. The system also incorporated a Net Zero Water control panel with colour HMI screen and communications to the Building Automation System.