The Kaweah Delta Water Conservation District manages the distribution of water to irrigation districts and city water districts over a service area. The primary crops grown in the district are cotton, various fruits, nuts, alfalfa, and other field crops. In addition to surface water, the district utilizes Central Valley Project water from the Friant-Kern Canal, which delivers water from the San Joaquin River to the Tulare Basin. Water can be turned out into either the Kaweah or St. Johns rivers, augmenting the water supply available to Kaweah Delta users. Groundwater is the other important source of water supply for the basin. The local aquifer has suffered from overdraft for many decades with an estimated annual deficit of between pumping and replenishment. In order to increase the rate of groundwater recharge, more than 40 recharge basins or spreading grounds totaling have been constructed throughout the district, which allow floodwaters to percolate into the ground.