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Section 3 - Weather Station and Transducer Data
Seventeen wells, CS‑1, CS‑10, CS‑11, CS‑MW1‑CC, CS‑MW2‑CC, CS-MW4‑LGR, CS-MW8-LGR, CS-MW8-CC, CS‑MW9-LGR, CS‑MW9‑BS, CS-MW9-CC, CS‑MW11A‑LGR, CS-MW11B‑LGR, CS-MW12‑CC, CS‑MW16‑LGR, CS‑MW16‑CC, and CS-MW18‑LGR are equipped with transducers to continuously log groundwater levels. Two weather stations are in place at CSSA, WS-N, adjacent to well CS‑MW16‑LGR in the north-central region of CSSA and the southern weather station (WS-S), in the southeast corner of CSSA adjacent to AOC‑65. Both record meteorological data including precipitation, wind speed, wind direction and temperature. The data are evaluated to identify trends in groundwater recharge. All transducer data collected from September 2003 through September 7, 2004, are presented in Figure 2-6. Interpolated data points are used for some wells where data gaps occurred due to well re-construction and/or transducer battery failure. Well CS‑MW16-CC data shown in Figure 2-6 does not indicate groundwater recharge conditions due to pumping which has occurred since February 23, 2004. Precipitation recorded at WS-N is shown.
Overall, groundwater levels in all three formations throughout CSSA decreased an average of 8.05 feet between June 14, 2004 and September 17, 2004. During this period WS‑N reported 32 rainfall events with a total precipitation of 14.3 inches, while WS-S reported 28 rainfall events with a total of 14.57 inches of rainfall. Rainfall events during this quarter occurred mainly in late June and early September, with 1.78 inches of rain recorded at WS-N and 1.21 inches of rain recorded at WS-S on June 9, 2004, and 2.6 and 2.06 inches of rain, respectively, on September 6, 2004. During the previous quarter when groundwater levels increased 75.82 feet, there were 43 rainfall events with a total precipitation of 12.95 inches at the WS-N and 40 rainfall events with a total precipitation of 12.33 inches at WS-S. For comparison of all events, Table 3-1 shows the total precipitation received each quarter, average groundwater elevations in each formation, the average groundwater elevation change in each formation, the approximate gradient, and approximate gradient flow direction.