. Bulletin. Science. PACIFIC LAMPREY IN THE SANTA CLARA RIVER 75 . PftQ^CT5\nSr*eRiCS\GCNCRAi.\SAHTA_ClAKA-RIVEB. The improvements consist primarily of a permanent concrete riverbed stabilization structure and diversion. These were necessary for the UWCD to maintain its ability to divert water to groundwater recharge basins in the Oxnard Plain Forebay Basin. Historical in-river aggregate mining destabilized and degraded the Santa Clara River bed, which had lowered approximately 22 feet opposite the diversion headworks since 1928, when diversions began. The down cutting of the riverbed also con
. Bulletin. Science. PACIFIC LAMPREY IN THE SANTA CLARA RIVER 75 . PftQ^CT5\nSr*eRiCS\GCNCRAi.\SAHTA_ClAKA-RIVEB. The improvements consist primarily of a permanent concrete riverbed stabilization structure and diversion. These were necessary for the UWCD to maintain its ability to divert water to groundwater recharge basins in the Oxnard Plain Forebay Basin. Historical in-river aggregate mining destabilized and degraded the Santa Clara River bed, which had lowered approximately 22 feet opposite the diversion headworks since 1928, when diversions began. The down cutting of the riverbed also contributed to repeated failures of the previous sand dike diversion structure. The permanent concrete structure, completed in 1991, has halted headcutting, stabilized the riverbed both upstream and downstream of the project, and im- proved the ability of UWCD to divert streamflow to groundwater recharge basins. The Freeman Diversion includes a two-entrance denil fish ladder, a fish screen, and by-pass facilities to provide anadromous fish passage upstream and down- stream of the diversion facility. Background The Santa Clara River drains portions of Los Angeles and Ventura counties in southern California (Figure 1). The mainstem Santa Clara River flows through a narrow alluvial valley onto a coastal plain and is fed by several tributaries that flow out of local mountains. The major tributaries are Santa Paula, Sespe and Piru creeks. Streamflow is typical of most southern California rivers—extremely low to intermittent flow in its lower reaches during the dry summer and fall. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Southern California Academy of Sciences. Los Angeles, Calif. : The Academy
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