Civil and Environmental Engineering

Project Portfolio
Torrance, CA

11 Acre Retail Redevelopment

"Stormwater runoff quantity and quality were major design concerns for this center. "

Thomas Graham provided civil engineering services for an approximate 11 acre retail redevelopment in Torrance, California. This development included a 141,000 SF Lowe’s Home Improvement Warehouse retail building, customer parking, ingress/egress improvements, and utility improvements. Stormwater runoff quantity and quality were major design concerns for this center.

Lowe's Warehouse - Torrance

In order to meet and exceed the expectations of the City of Torrance and the L.A. County Department of Public Works, bioswales, Ultra-Urban Filters, FloGard Downspout Filters, Passive Skimmer Smart Sponges, and Line Skimmer Smart Sponges were used in order to provide stormwater treatment prior to discharging water from the redeveloped site.

The existing city stormwater system at the location of this site was undersized and historically experienced problems with water backing up during large storm events.

This development reduced the impact on the city storm water system by storing water onsite using bioswales and an underground HDPE detention system. A flap gate was designed to retain water stored in the bioswales and underground detention system whenever the city’s stormwater lines were overburdened. Additionally, runoff from the Torrance Municipal Airport that historically passed through this site was diverted around the site using berms, ditches, and a concrete lined channel.

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