| Year | Average Annual Precipitation | Central Basin Area | Rain Volume | 15% of Volume | 15% of Volume | Recharge Rate |
| (Inches) | (acre) | (AF/year) | (AF/year) | (ft3/day) | (ft/day) | |
| 2005 | 23.29 | 248,000 | 481,327 | 72,199 | 8,616,951 | 0.0007977 |
| 2006 | 25.36 | 248,000 | 524,107 | 78,616 | 9,382,820 | 0.0008685 |
| 2008 | 13.8 | 248,000 | 285,200 | 42,780 | 5,105,793 | 0.0004726 |