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<br />0':> <br />M <br />M <br /> <br />" <br /> <br />CHAPTER VI <br /> <br />OTHER PROJECT USES <br /> <br />provide up to 3,500 acre-feet of municipal water annually by increasing <br />the capacity of Rifle Gap Reservoir. A municipal supply in ~xcess of <br />3,500 acre-feet would require constructing costly hold-over storage <br />capacity in the reservoir or decreasing the supply availablti for irri- <br />gation. A 6-m:ile conduit would be requirtid to convey water from the <br />reservoir to Rifle. <br /> <br />The added cost of providing storage capacity for municipal water <br />in various amounts is shewn in the following table. <br /> <br />"J' , <br /> Municipal Municipal <br />Active supply Municipal storage <br />reservoir ca)aci ty available storage cost <br />(acre.,.fel't (acre.,.f\Jet) cost (a/acre-foot) <br />7,000 011 - - <br />8,000 1,500 $ 330,000 220 <br />9,000 2,600 600,000 230 <br />10,000 3,300 860,000 I 260 <br />11 , 000 3,800 1,100,000 I 290 <br /> <br />ESTIJ,;ATED STORAGE COST OF,l-.UNICIPAL WATER <br />RIFLE GAP RESERVOIR <br /> <br />~'. I <br />:~ <br /> <br />.:'1 <br /> <br />{: <br /> <br />~ : <br /> <br />1/ 7,000 acre-feet is the active stor age capacity required for <br />irrigation use. <br /> <br />" <br /> <br />" <br />" <br /> <br />Analyses of water at the Rifle Gap Dam site, made in 1941, indicate <br />the quality of flow at too t point. The water would be similar in quality <br />for municipal use to that of the Colorado River near Rifle, but inferior <br />to the water of Beaver Creek. The average water quality that woulil be <br />stored in Rifle Gap Reservoir, determined by weighting samples accord- <br />ing to the volwne of run-off during the period they represent, is shown <br />in the following" table. - <br /> <br />":'1 <br /> <br />"2'-' I <br /> <br />~ <br />-t: <br /> <br />.. ' "EltPres.sed in nart5 at: roi1lion, ' ' <br /> Dissolved <br /> Ca Mg CO., HC03 Cl SOl.. solids pH <br />Maximwn <br />recorded 183 83 19Y 305 15 653 1310 8.0 <br />Weighted 11 , 2l.., 7.8 <br />aVera~e 110 40 0 7 280 664 <br /> <br />ANALYSIS OF R~fLE CREEl{ WATER <br />AT RIFlE Gill' DAM SITE <br /> <br />:~)! <br /> <br />11 Weighted with run-off distribution during 1941 water year. <br />2:./ Sample taken following 1941 water year. <br /> <br />/,7 <br />