Largest Stormwater Detention System, To Date, Installed in Southern CA
LAKE FOREST, Calif. (January 2017) – Oldcastle Precast, worked with owner LS-OC Portola LLCL, general contractor Landsea Holding Corporation, and engineer Hunsaker & Associates to design and manufacture several of the largest and deepest StormCapture® stormwater detention systems installed to date.
StormCapture is an underground precast concrete stormwater management system. StormCapture’s pre-engineered components allow for site-specific configurations, while providing large storage capacity in a small footprint.
Portola Center is a 195-acre community development, divided by Glenn Ranch Road into the “Portola North” and “Portola South”, in Lake Forest, California. The 95.5-acre Portola Center South community features new single-family homes and mixed use buildings with senior affordable units, townhomes. The community also features a 10,000-square foot ground floor commercial space as well as a five-acre public community park and perimeter trails.
The magnitude of this project and its increased impermeable areas made managing hydromodification (stormwater runoff) a top priority. Stormwater is managed throughout the project through ten separate “Basins”, providing a total detention storage volume of 820,886 cubic feet (18.85 acre-feet). Basin No. 5, the first StormCapture detention system installed at Portola Center South, was designed to store 198,152 cubic feet (4.55 acre-feet) of stormwater, which detains up to a 10-year storm event with an internal orifice discharging the water quality volume to a downstream bio-filtration system.
The Basin No. 5 StormCapture system, manufactured at the Oldcastle Precast plant in Perris, California, has an inside height of 14 feet and was designed to withstand 16-feet of backfill over the entire system. The system was fully encased with a geotextile and impermeable liner.
Oldcastle Precast Salesperson and Project Manager Mary Scott noted, “The success of this project is due in large part to the collaborative efforts and cooperation among Oldcastle Precast –Southern California, Oldcastle Stormwater Solutions, Landsea Holding Corporation.
Along with the StormCapture detention systems, Oldcastle Precast plants in Southern California also manufactured and delivered large bio-filtration units to address the water quality requirements for the project.
Shelby Hull, Director of Oldcastle Stormwater Solutions for the Southwest Region stated, “Oldcastle Precast is the perfect design partner for all stormwater needs, big and small. Our team of stormwater experts, design engineers, and national manufacturing capabilities, make Oldcastle Precast the clear choice for developing custom solutions to meet the specific regulatory needs for projects. Unlike other companies that only design systems and then use third party manufacturing, Oldcastle Precast maintains control and ensures quality throughout the design, manufacturing, installation, and life of the project.”