| OCR Text |
Show - 14 - Area and Reference Type of material Specific yield (Percent) Grand Island, Nebraska (Wenzel, 193G) Coarse sands 22-23 Mokelumne area, California Hard, sandy clay (Stearns, Robinson and to medium-grained Taylor, 1930) sand 0.3 - 20 Mokelumne area. Very fine sand, California silt and clay 3.5 (Piper, Gale, Medium and fine sand 22.6 Thomas, and Gravel and coarse sand 35 Robinson, 1939) All materials 12.8 Santa Clara Valley, California (Estimate made by Clark, cited in Piper, Gale, Thomas, and Robinson, 1939) 12 Safford Valley, Arizona (Gatewood and others, Floodplain 1950) materials 16 Phoenix area, Arizona (Turner, McDonald and Silt, sand and Cushman, 194G) gravel 15 Verde River, Arizona (McDonald and Padgett, Sands and gravels 3.7 - 30.3 1945) Average 16 Average specific yields for individual basins in the table below are based on the above data and on knowledge of the geology of each basin. It is estimated that 60,7 70,000 ^acre-feet of water are stored in the combined areas of the basins |
