Santa Clarita, CA
PACE is designing a regional infiltration BMP facility and developed a Green Streets LID Application Guideline for the City of Santa Clarita. Several potential regional infiltration BMP sites were identified within the Upper Santa Clara River Watershed Management Group (USCRWMG) Enhanced Watershed Management Plan (EWMP), but a more in-depth analysis was required to determine the viability and infiltration effectiveness of each location. The City plans to meet a goal of 41 acre-feet (AF) of structural BMP capacity by the year 2020 and 60 AF by the year 2022. BMP infiltration facilities will help them reach these short-term goals, while a mixture of BMP and LID implementation will assist in their long-term infiltration volume goals. In order to help the City reach their short-term infiltration goals, PACE performed an investigation of these potential sites which included site evaluations for suitability, infiltration optimization, development of optimum layouts, and construction cost estimates. Factors such as infiltration rates, proximity of the groundwater table, existing utility conflicts, 85th percentile watershed runoff volume, and feasibility of tapping into the storm drain system heavily influenced the investigation process. A rigorous alternatives analysis was then performed to carefully evaluate the merits of each site and PACE made recommendations to the City. The City selected a site and PACE is currently performing final engineering design and construction drawings to support the implementation of the selected regional BMP location. These features will also serve as educational pieces and enhance community value.
Implementing more Green Street LIDs will help maximize infiltration volumes and properly manage/treat pollutants resulting from stormwater and non-stormwater runoff within the City’s boundaries, while meeting the requirements of the NPDES MS4 Permit. The Green Streets LID Application Guidelines will offer a streamlined selection process and design requirements needed to implement these LID practices throughout the City, which provide significant pollutant removal and aesthetic community benefits.
City of Santa Clarita