The District acquired a 150-acre parcel and is in the process of acquiring a 20-acre parcel that would be used for the construction of a recharge basin with multiple cells to provide for sustainable management of surface and groundwater. The current project is identified as Turnipseed Basin Phase VI Expansion.
Project components could include ponds/cells within the basin separated by levees, performance testing, and demobilization. The District will excavate approximately 200,000 cubic yards of material from the site to form the overall basin. The basin will be further divided into approximately eight (8) cells to accommodate the varying topography and to minimize erosion by wave action. New levee construction would not exceed six feet, measured from the exterior toe to the top of new levee. The Project design will balance the earthwork, and no export of soil is anticipated. The Project will include a settling channel on the east side and an overflow basin along its western edge.
The Project may also include construction of a network of monitoring wells if needed to supplement existing monitoring wells associated with the existing banking operations that currently exist in proximity to the Project. Construction of those Project components would likely occur after construction of the basins are complete. The only pipelines contemplated in the Project would serve to introduce water for recharge/banking via construction of a tee in the existing Ave 40 Lateral. The District envisions that the basin will receive water from Lateral 113.7W which originates at a 97 cfs, 66-inch turnout on the Friant-Kern Canal, then extends west along Avenue 40 and beyond the Project site. At the Project location, the lateral is 48-inch diameter reinforced concrete pipe and has an approximate capacity of 75 cfs.
If recovery wells are constructed, they would tie into District laterals through newly constructed intertie facilities. Any banking return via District recovery wells on the 170-acre site would flow back to the Ave 40 mainline or other laterals. None of the recovered water would be returned to the Friant-Kern Canal.