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casing program, well depth, completion interval, water level and well yield. Not all permits <br />contain this additional information and the permits are not cross-referenced. While the geologic <br />and hydrologic information associated with an individual permit may be acceptable, the <br />consistency of these other data in the permit records is poor. <br />3.7.3 Additional Data Required <br />The SPDSS would benefit from a program to verify locations of wells. Such programs are <br />underway both through the SEO Division 1 and Water District 47 office and through GASP. <br />The improved well location data will be populated in the well permit database. The SEO <br />program may take as long as ten years to complete at the current funding rate. Therefore it is <br />recommended additional funding be provided by the SPDSS so that the program could be <br />completed in one to three years. <br />It would be beneficial to link the well permits database to the water rights database. A procedure <br />and utility program to produce this link were developed as part of the RGDSS effort. The same <br />procedure would be adequate for use on the SPDSS. This process is discussed further in <br />Chapter 4, DSS Components. <br />3.8 GROUNDWATER PUMPING <br />This section discusses existing information and data needs relating to groundwater pumping from <br />wells. Pumping data can be used to (1) characterize historical water usage, (2) evaluate the <br />location and timing of stream depletions, and (3) assess future water supply options. Pumping <br />information will be used in the groundwater modeling efforts to quantify changes in aquifer <br />water levels, stream depletions and aquifer yields. <br />3.8.1 Description and Inventory of Available Data <br />Information on existing well data is discussed in Section 3.7. It is assumed that essentially all <br />higher capacity wells have permits and/or water rights and, therefore, are included in the SEO <br />databases. <br />A summary of wells by Water District and pumping rates for wells with absolute and conditional <br />water rights obtained from the SEO water rights database is presented in Table B-6 in <br />Appendix B. As shown in this table, wells with rights to pump over 500 gallons per minute <br />(gpm) represent less than 23 percent of the total number of wells but these same wells have the <br />rights to over 88 percent of the water. For greater efficiency it is expected that groundwater <br />modeling and evaluations in the SPDSS will focus on wells with pumping rates greater than 50 <br />gpm. Table B-6 shows that wells with water rights of less than 50 gpm constitute less than 2 <br />percent of groundwater pumping in Division 1 and Water District 47. <br />p:data\gen\spdss~final report\chapter 3.doc 3 -17 <br />October 31, 2001 <br />