NOTICE of Water Right Petitions for Temporary Urgency Changes for the Los Angeles Department of Water and Power

From the State Water Resources Control Board:

The Los Angeles Department of Water and Power has filed petitions for temporary urgency changes for water right Licenses 10191 and 10192 (Applications 8042 and 8043). To view the Notice and project information, please visit the Division of Water Rights website at:   https://www.waterboards.ca.gov/waterrights/water_issues/programs/petitions/temporary_urgency.html

With the TUCPs, LADWP requests authorization to temporarily change existing water right terms and conditions from June 17, 2024, to July 23, 2024. Currently, the 2024 runoff year is forecasted to be a Normal Year type for the purpose of determining Rush Creek Stream Ecosystem Flows (SEF). A Normal Year will require a Snowmelt Peak flow of 380 cubic feet per second (cfs) for 3 days between June 23 and July 3. Peak flow releases cannot be met by the existing outlet valve due to mechanical issues.

Malfunction of the Grant Lake Outlet valve is leading to cavitation in an unsafe manner above 175 cfs, which cannot be remediated prior to the requested change date. To avoid failure, the outlet valve’s flow is limited to 175 cfs while replacement work is planned and implemented.