17 th Avenue Residence Hall Project Energy Management – a division of Facilities Management Stormwater U: Innovation in BMPs April 1, 2014 Session 3: Harvesting stormwater to use in toilets at the University of MN – Minneapolis Campus

17 th Avenue Residence Hall Project Energy Management – a division of Facilities Management Project Need More on-campus housing Competitive in the marketplace, attract students (our customers value sustainability) Key Sustainability Features Energy Star certified efficient equipment Heat recovery mechanical systems High efficiency plumbing and lighting fixtures Vegetated roof Water reclamation system

17 th Avenue Residence Hall Project Energy Management – a division of Facilities Management (Yet Another) Site with Constraints 1.4 acre site with a ~ 1.0 acre building footprint No on-site parking (minimal open space) Adjacent fraternities and public right-of-way High groundwater

17 th Avenue Residence Hall Project Energy Management – a division of Facilities Management Stormwater Management Needs University is an MS4 Meet B3 requirements for volume reduction and rate control Meet City of Minneapolis rate control for connection permit Why Harvested Rainwater? Infiltration not desirable Re-use a viable method for volume reduction Meets the sustainability goals for the building and institution A 600 bed facility with LOTS of toilets = opportunity!

17 th Avenue Residence Hall Project Energy Management – a division of Facilities Management The Collection System Primary storage: 35,000 gallon concrete vault Overflow storage: ~ 530 ft of lined StormTech MC-3500 chambers Rainwater mainly from roof drains

17 th Avenue Residence Hall Project Energy Management – a division of Facilities Management The Process Two 1000 gallon tanks Fill pipe from exterior systemOzone water treatment system Water Control Corp rd Ave NW Ramsey, MN 55303

17 th Avenue Residence Hall Project Energy Management – a division of Facilities Management City sewer plus meter Dye tank Pumps City water or storm water here Non-Potable Dedicated Toilet Plumbing System

17 th Avenue Residence Hall Project Energy Management – a division of Facilities Management Live online dashboard