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<br />--- . -- ~ _~___ ___p_ ~_ _ _u_ ___ _.._ _,.._ _ __.__. _"__ <br /> <br />a privately owned 40,000 gpd water treatment plant with continued service from Pagosa Springs). <br />The upstream site was recommended because it was determined to be the least costly of the three <br />alternatives, was about the same cost as paying for continued water service from Pagosa Springs, and <br />could be implemented almost immediately. <br /> <br />3.3 IDDDEN VALLEY RESERVOIR APPRAISAL LEVEL EVALUATION OF <br />RESERVOIR WATER YIELD <br /> <br />As titled, this report evaluated the yield of a Hidden Valley ,reservoir using three sources, which <br />were: natural inflow within the basin, diversions from Four Mile Creek utilizing Four Mile Ditch, <br />and diversions from Four Mile Creek using the Dutton Ditch. Since there was little historic flow data <br />for McCabe Creek, the study projected average runoff per square mile; it then varied the average <br />flows for the years 1975 through 1979 by the percent that the San Juan River at Pagosa Springs was <br />above or below its long term average for those same years. The study utilized Four Mile Creek flow <br />based upon a continuous recording gage that W.W. Wheeler and Associates installed for Fairfield <br />Pagosa for about six months out of every year from 1971 to 1978. Where monthly flows were <br />missing, this data was estimated. <br /> <br />The study concluded that 2,500 acre-feet of active reservoir capacity in Hidden Valley Reservoir <br />would yield 800 acre-feet per year from natural inflow, and 700 acre-feet per year from flows <br />imported through the Dutton Ditch. Several other recommendations were made relating to the <br />installation of flow gages at the Hidden Valley site on McCabe Creek, and upstream of the Dutton <br />Ditch headgate on Four Mile Creek, in order that the assumptions utilized in the study be validated <br />prior to proceediIlg further, <br /> <br />3.4 PRELIMINARY ENGINEERING STUDY OF PA WSD FOR DOMESTIC WATER <br />SUPPLY FACILITIES - .JANUARY 1989 <br /> <br />This study investigated water rights and projected the water requirements of the P A WSD for the <br />period 1990 through 2005. It provided some historic data on connections, population and system <br />usage within the P A WSD water system. It also included preliminary cost estimates for a combination <br />of alternatives to provide treated water to P A WSD customers. <br /> <br />3-2 <br /> <br />S9s\PAGOSA FS\S3.TXT <br />l0I27/g], mm <br />