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Action: Capture and treat stormwater and dry weather flows before they reach the river channel for groundwater recharge, direct use, water recycling, or release for downstream beneficial uses.

The primary sources of water flowing into the LA River are wet weather (stormwater) runoff originating from precipitation on the watershed and dry weather inputs from the watershed, including incidental urban runoff and groundwater upwelling.

The dominant source of dry-weather flow is recycled water discharge from the Donald C. Tillman Water Reclamation Plant (DCTWRP), the Los Angeles Glendale Water Reclamation Plant (LAGWRP), and the Burbank Water Reclamation Plant (BWRP). Much of this flow originates from waters imported from outside the LA River watershed. Projects that strategically capture and treat these flows before they reach the river would expand water supply opportunities and improve water quality in the watershed and along the river corridor.

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specific, tangible ways to reach the goal

Note: Flow volumes are calculated from LA County Watershed Model. Comparison of modeled flow volumes with USGS gage 11103000 at LA River above Long Beach for the period of available overlapping record (WY1989 - WY1992) indicates modeled annual flow volumes are typically within approximately 1% of measured annual flow volumes (LACDPW, 2010, Figure 84).
Average annual wet weather flows entering the Pacific Ocean at the mouth of the river during one water year (October 1st - September 30th).
LACDPW, 2010, LA County Watershed Model Configuration and Calibration --Part I: Hydrology, LADWP, 2015, Stormwater Capture Master Plan, August 2015. Prepared by Geosyntec.
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