Deepest & Largest StormCapture® System Underway in Southern California

Lake Forest, California



Hunsaker & Associates

Irvine, California

The Problem

Portola Center is a 195-acre community development, divided by Glenn Ranch Road into “Portola North” and “Portola South” in Lake Forest, California. The 95.5-acre Portola Center South community features both new single-family homes and mixed-use buildings. 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 can detain up to a 10-year storm event with an internal orifice designed to slowly discharge the water volume to a downstream biofiltration system.

The Design

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 an impermeable geotextile liner. Along with the StormCapture detention system, Oldcastle Precast plants in Southern California also manufactured and delivered large biofiltration units to address the water quality requirements for the project.

The Solution

Shelby Hull, Director of Oldcastle Stormwater 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 the clear choice for developing custom solutions to meet the specific regulatory needs for projects like this. 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 system.”

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