SECONDARY BENEFITS OF STORMWATER BMPS Growing Sustainable Communities, October 2017 2015
STORMWATER BMPS BENEFITS - AGENDA Stormwater Management Traditional Impacts Stormwater BMPs Primary Benefits Secondary Benefits Case Studies
STORMWATER MANAGEMENT Traditional Approach Conveyance system of curbs, pipes, open ditches, pump stations, detention basins, etc. MINNPOST
STORMWATER MANAGEMENT Stormwater Management Hydrologic Impacts USEPA: Protecting Water Quality from Urban Runoff California Water & Land Use Partnership
STORMWATER BMPS Stormwater Management Traditional Approach More Water Faster Higher peak flow rates Greater total volume Increased water velocities Flooding Erosion Degraded water quality Degradation of habitat
STORMWATER BMPS Stormwater Management Best Management Practices (BMPs) BMPs: is a technique, measure, or structural control that is used for a given set of conditions to manage the quantity and improve the quality of stormwater runoff in the most cost-effective manner. BMPs Should: 1.Reduce peak flows 2.Reduce runoff volume 3.Remove pollutants Post-Development = Pre-Development 1.Discharge Rates 2.Volumes 3.Loadings
STORMWATER BMPS TYPES Infiltration systems (trenches, basins, bioretention systems, bioswales) Constructed wetland systems Detention systems Wet-detention systems Filtration systems (sand filters) Vegetated systems (grassed swales, vegetated filter strips)
STORMWATER BMPS PRIMARY BENEFITS Primary Benefits Water quality treatment Water quantity reduction and attenuation -mitigate flooding -prevent or reduce erosion -minimize pollutants -preserve habitat
Aesthetic appeal Creation of habitat Resolution of secondary issues Cost savings Expand funding options/opportunities Educational/awareness opportunities Community benefits
Aesthetic Appeal Big improvements Very flexible (vegetation, design, elements) Lots of options American Academy of Environmental Engineers and Scientists The Habitat Network
Creation of Habitat Aquatic, wetland, upland habitat Connect existing habitat Pollinators, songbirds, insects, waterfowl Inputs of irrigation, fertilizer, or pesticides minimized or eliminated
Resolution of Secondary Issues Peripheral Intentional or unintentional Save Money Cut costs as compared to traditional stormwater management Cut other costs, such as heating and cooling (e.g. green roof), maintenance and repair Deserves careful consideration
Leverage and expand funding opportunities Local, state, and national levels Small to large $ Examples WQI, Municipal/County Cost-Shares
Educational opportunities Varied audiences and settings Hands-on learning Develop community awareness
Community Benefits Local aesthetics Community engagement, participation, and partnerships Preserve or enhance open spaces Creative environment
Case Study North Liberty Centennial Park Permeable Pavers Parking Lot Bioswale
Case Study North Liberty Centennial Park
Case Study North Liberty Centennial Park, Added Benefits Aesthetic appeal and interest Funding - Vision of existing park plan Diverse landscape and habitat Exercise leadership in Stormwater Best Management Practices Excellent stormwater quality education/awareness mechanism
Case Study Hills Streetscape Permeable Pavers Parking Stalls Main Street Bioswales existing ditches -High visibility
Case Study Hills Streetscape Downtown revitalization Funding Aesthetic appeal Community improvements Educational opportunity
Case Study City of Readlyn Bioretention Cells
Case Study City of Readlyn Bioretention Cells Relatively flat Curb and gutter Sump pumps
Case Study City of Readlyn Bioretention Cells Constructed wetland Runoff from half the town outfalls here Potentially additional funding
Case Study City of Readlyn Bioretention Cells Expanding funding opportunities Aesthetic appeal Educational opportunity Community improvements Resolve secondary issues
Case Study Quad Ravine, University of Iowa Campus Rain gardens - Heavily used pedestrian walkway - Drainage and erosion problems - Reconstruction of the ravine
Case Study Quad Ravine, University of Iowa Campus
Case Study Quad Ravine, University of Iowa Campus Aesthetic appeal Habitat Educational opportunities Community improvement
Case Study IBEW Local 697 New Hall & Training Facility Rooftop garden Bioswales - Sustainability - Living Classroom
Case Study IBEW Local 697 New Hall & Training Facility Rooftop garden Bioswales
Case Study IBEW Local 697 New Hall & Training Facility Aesthetic appeal Educational opportunities Habitat
Case Study Dakins Lake Constructed wetlands Increase in park size Master plan developed Chain of wetlands above existing lake Capture sediment, reduce nutrient loading
Case Study Dakins Lake Chain of wetlands Interpretive panels
Case Study Dakins Lake Habitat Secondary benefit lake improvements Community improvement Public education
Case Study North Liberty Penn Meadows Rain gardens Permeable asphalt
Case Study North Liberty Penn Meadows
Case Study North Liberty Penn Meadows, Added Benefits Habitat Educational opportunity Community engagement