The Broadway Neighborhood Stormwater Greenway Project was identified through the Central and West Coast Basins Distributed and Regional Stormwater Capture Feasibility Study as an ideal local project for immediate implementation of neighborhood-wide Low Impact Development (LID) designs aimed at meeting total maximum daily loads (TMDL) and recharging potable groundwater aquifers.
The Feasibility Study was funded by the Water Replenishment District of Southern California (WRD) and design and implementation funding was awarded through the Proposition 84 Stormwater Grant Funding Program and the City of Los Angeles' Proposition O program. The project includes design and implementation of four levels of stormwater capture and infiltration Best Management Practices (BMPs): (1) residential LID measures for up to 8 acres; (2) neighborhood-scale LID for 12 acres; (3) commercial LID measures for three acres, and (4) a sub-regional- scale facility for 30 acres of mixed land uses during wet weather design storm events and up to 180 acres during dry-weather and smaller storm events.
Geosyntec's Scope of Services
After completing the recharge prioritization and conceptual project designs for the WRD, Geosyntec assisted the City of Los Angeles in developing a grant application to secure Proposition 84 funds for project implementation. The grant application involved creating a detailed project budget and schedule, identifying project objectives and project performance measure, and developing a monitoring program to meet grant requirements. Following award of the design contract, Geosyntec developed the pre-design report, performed site investigations, and developed the 100% design and specification documents for the stormwater Best Management Practices (BMPs). Geosyntec managed focused aspects during construction and is performing the post-construction monitoring.
Geosyntec forged the concept of neighborhood-scale phase LID implementation for this project. The regional BMP design was sized based on the assumed future condition of full LID implementation throughout the neighborhood. While this sizing initially results in excess flows bypassing the regional system, it promotes continued LID implementation throughout the neighborhood. As a result, the final condition utilizes local capture and prevents un-utilized capacity in the regional facility. This design approach promotes efficient use of funds for LID projects as well as supporting implementation of distributed small-scale LID with its associated water quality, water supply, recreation, and habitat benefits throughout neighborhoods.
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- Location: Los Angeles, California
- Client: City of Los Angeles
- Project Practice Areas: Water & Wastewater, Environmental Management, Water and Natural Resources
- Type of Facility: Low Impact Development
- Services Provided: LID Design, Construction Management, Performance Monitoring, Funding Support, Water Quality Compliance, Water Supply Augmentation
- Type of Work: Water supply augmentation
- Governing Regulation: State and local