June 24, 2015

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Geosyntec Completes Los Angeles’ Stormwater Capture Master Plan Project

Principal Mark Hanna (Los Angeles) will be presenting the Los Angeles Department of Water and Power's Stormwater Capture Master Plan at this evening's final hearing. Geosyntec was awarded this project as the prime contractor two years ago and will be closing the project out Thursday, June 25. Project Engineer Rebecca Batchelder (Los Angeles) was critical to this project and Sr. Engineer Aaron Poresky and Sr. Staff Engineer Scott Mansell (Portland) were integral as well. The final hearing for the Stormwater Capture Master Plan is scheduled for 6 p.m.at DWP Headquarters, at 111 N. Hope St., Los Angeles.

The plan includes three large-scale projects in the San Fernando Valley that would collect rainfall in basins or washes and then slowly feed it into the city's primary underground water source, a process known as aquifer recharge. It is an initiative that officials say will reduce the city's future reliance on imported water and perhaps address a predicted trend toward heavier, more intense rainfall.

The proposal also lists a variety of smaller features that would be located on public, private and commercial properties throughout the city: Water-permeable surfaces that would help recharge the San Fernando Valley groundwater basin, as well as redesigned "green streets" and pocket parks.

According to the Los Angeles Times, the city collects an average of 27,000 acre-feet of rainwater each year. That water is captured in flood control dams and spreading grounds, where it is allowed to filter into the aquifer. Under the Stormwater Capture Master Plan, the city could collect 100,000 to 200,000 additional acre-feet of rainwater each year by 2035, depending on how aggressively it pursued the plan, officials say. One acre-foot of water is equal to 326,000 gallons, or about enough to supply two households with water for a year.

For additional information on the SCMP, read the Los Angeles Times article "DWP to unveil plan to capture storm runoff" >>

For more information on the LADWP Stormwater Capture Master Plan, contact Mark Hanna at 310-957-6113 or This email address is being protected from spambots. You need JavaScript enabled to view it. and Ken Susilo at 310-957-6111 or This email address is being protected from spambots. You need JavaScript enabled to view it..