15 Take Advantage of Areas with Infiltration Potential Are there areas of your park with great drainage, such as those with sandy soils? These spots can infiltrate a large amount of stormwater and are preferred locations for green drainage practices. Locating these features in a welldrained area saves money because the native soil can be used, and temporary standing water after storms is minimal. Case Study: Recharging Water Supplies with Treated Stormwater Los Angeles, California Sun Valley Park in Los Angeles County, California, was converted to a multi-use site that reduces flooding, treats stormwater, and conserves water while continuing to provide recreational benefits. The park collects runoff from a 21-acre drainage area. The stormwater is piped into a treatment system to remove pollutants. Treated water then flows to infiltration basins located underground beneath the soccer and baseball fields to recharge the groundwater aquifer. The project also includes enhancements to recreational amenities, including new sport fields, seating, lighting, and signage. Project benefits include: • Reduced flooding • Water conservation (30 acre-feet/year) • Native plant landscaping • Recreational ballfields, lighting, bleachers The project was completed in 2006 for approximately $7 million. It was funded by a Department of Water Resources Local Groundwater Assistance Grant, a Proposition 12 Grant through TreePeople, and the Los Angeles County Flood Control District. Figure 7. Top: Sun Valley Park vegetated swales. Bottom: underground infiltration gallery. (Source: Los Angeles County Flood Control District)
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