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<br />.., <br /> <br />.' <br /> <br /> <br />("- <br /> <br />Qa23'10 <br /> <br />, <br />" <br /> <br />MAP OF SAN LUIS VALLEY <br />SHOWING <br />UNCONFINED AQUIFER STORAGE STUDY AREA <br /> <br />BY <br />DAVIS ENGINEERING SERVICE, INC. <br />576 SPRUCE STHEET, P. O. BOX /30 <br />DEL NORTE. COLORAOOBII32 <br /> <br />Wallal <br /> <br />LEGENO <br />... LOCATION OF OBSERVATON WELL <br />NM NO MEASUREMENT <br />P PUMPING <br />D DITCH WITH WATER <br />PLUGGED WELL <br /> <br />S'-CJ.GR.lNT <br /> <br />/ <br /> <br /> <br />STUDY AREA BOUNDARY <br />FOR <br />8 AQUIFER STORAG~COMPARISON <br /> <br />CHANGE IN UN <br /> <br />'l~IH%- -"-" <br /> <br />I <br /> <br />+~ <br />\ <br /> <br />A ... <br /> <br />... <br /> <br />0( <br /> <br />... <br /> <br />EXPLANATION <br /> <br />Change in unconfined aquifer storage has been calculated for a defined area <br />which is shown on the above map. The changes in aquifer storage were based <br />on approximately 27 RGWCD monitoring wells located within the area. The <br />method of computing the change in aquifer storage was in accordance with the <br />Thiessen mean method whereby a polygon is constructed around each observation <br />well and the assumption is made that the change in water level throughout <br />the area of the polygon is the same as the change in the well within the <br />polygon. A graph showing changes since 1976 is attached. Zero on the vert- <br />ical axis of the graph was assumed as corresponding to 1976 for graphing <br />purposes; however, it should not be assumed that the unconfined aquifer was <br />at equilibrium as of that date. <br />