HR: 0800h
AN: H11F-0384    [Abstracts]
TI: Challenges of Artificial Recharge at the Chain of Lakes
AU: * Zeng, X
EM: xqz6232@yahoo.com
AF: Stetson Engineers, Inc., 2171 E. Francisco Blvd, Suite K, San Rafael, CA 94901 United States
AB: A series of gravel quarry lakes, A through I (i.e. Chain of Lakes) in Alameda County, California are planned to convert to off-channel spreading lakes for artificial groundwater recharge. An operational plan is needed for the near-term improvements that would allow safe and efficient operations of Lake H and Lake I recently acquired for artificial recharge operations. Water source for the groundwater recharge comes from State Water Project (SWP) water releases at the South Bay Aqueduct turnout. The released water flows approximately nine miles in Arroyo Mocho Creek to the planned diversion facility. The recharge system includes multiple water delivery components and recharge components. Reliability of SWP water delivery is a water supply constraint to the recharge system. Hydraulic capacities of each delivery component and recharge capacities of each recharge component are physical constraints to the development of the operational plan. Policy issues identified in the Mitigated Negative Declaration which contains mitigation measures addressing potential impacts of fisheries and erosion are regulatory constraints to the operational plan development. Our approach that addresses technical challenges and policy issues in the development of the operational plan includes i) determination of lake recharge under observed conditions using water budget method; ii) development and calibration of a ground water flow model using MODFLOW; iii) estimation of lake recharge capacity for a range of lake levels using the calibrated ground water flow model; iv) analysis of clogging layer effects on recharge capacity; and v) development and application of operations models for the stream delivery system and the lake system.
DE: 1832 Groundwater transport
DE: 1836 Hydrologic budget (1655)
DE: 1857 Reservoirs (surface)
DE: 1884 Water supply
SC: Hydrology [H]
MN: 2004 AGU Fall Meeting