Winning awards from Stormwater Solutions (SWS) and CASQA, the Broadway Neighborhood Greenway Project has set a high bar for how to do a Green Street Retrofit. The neighborhood wide project, which was a partnership between the City of Los Angeles, CA State Water Resources Control Board, Water Replenishment District of Southern California, Santa Monica Bay Restoration Commission, and Geosyntec Consultants, covered 228 acres (approximately 8 blocks) of developed commercial and residential property in South Los Angeles. At $4.6 million, the project included a multi-tiered approach to low impact development (LID) and infiltration best management practices (BMPs) as well as improved pedestrian connectivity throughout the neighborhood.
The LID goals of the project were to manage stormwater runoff for the purposes of increasing groundwater recharge (sustainable water supply) and addressing total maximum daily load (TMDL) water quality requirements. It was meant to be a replicable model to be used again and again across Los Angeles.
The project deployed the following stormwater BMPs:
• Rain Gardens
• MaxWell® Drywells
• Infiltration Swales
• Infiltration Galleries
The award winning project was designed to capture, treat, and infiltrate stormwater in the public right-of-way as well as on private residential and commercial properties by replacing asphalt, concrete, and water intensive landscaping with 19 residential rain gardens, 4 parkway swales, 8 MaxWell drywells, and a 531,000 gallon underground infiltration gallery. Based on the size of the watershed, these BMPs are projected to conserve approximately 41 acre-feet (roughly 13.35 million gallons) of stormwater annually…stormwater which would have ultimately wound up in the Pacific Ocean.
Aside from the technical aspects, one of the biggest successes was the way that City Staff worked with current residents and business owners to assure a positive outcome. The project’s outreach team rolled up their sleeves and took the time to build rapport and trust with key individuals and neighborhood leaders, who then became strong project advocates. The approach clearly worked.
Civil Engineers and Contractors are part of the stormwater management community. The systems you select to implement as your stormwater solution for your projects affect more than just the bottom line. MaxWell drywells are a low-cost, low-impact solution that pre-treats stormwater for constituent removal prior to infiltration.