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<br />4
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<br />SoL ls
<br />
<br />Most of the soi 1s and subsoi'is of c(1o'.:: Lu\-.,c( C;Lrl::\',-C);-: 1,.::,11e/ ,~!r.e der(ved
<br />from the Mancos shale fa,-mati0;1 i;vhf~h ,-HH1t";~ i(;~ IhL"'" <~:ytIl.e v~l ley, This
<br />marine shale formation has a very high salt contenc ~nd ground water
<br />percolating through the shale picks e,p high co"c.entri"':ic",,; of salt \'ihic"
<br />are transported to the Gunn i SOi'~ l~ 'i ;fer by" \.v:='~s':_f:',.'::":'j':., ~: j t\:.~.~I::s (;1' natur:~ I
<br />ground water movement to the rlv.~r. Th2 :_hicknes',: (J!t-, HQn..:r~s s,_::lt-
<br />bearing formation ranges from 3,000 to 5,000 feet. ~ N~t'o"al So')
<br />Survey covers the irrigated land" pn)vid1ng a d3ta bd;~e for conservdt:un
<br />farm planning. The soils derived from th0 Mancos 312'~ are high in cis;
<br />and silt content, slowly permeahle, high in so'ubl!:~ 21,." "Ie'",! "\l~c:~r'l-
<br />tible to sheet and gully erosion and require care:',,] "'i.iL3'J,,,neC1t.
<br />
<br />Water Resources
<br />
<br />The water resources of any watershed are a combinatiDn of ti;e p~ecip:t;l"
<br />tion, by type and timing, plus surface streamflow, ground water and
<br />lakes. Man-made reservoir storage and trans-basin ~,ater movement improve
<br />timing and total suppl ies available for use. The Quantity and qual ity
<br />of stream outflow has also become of special interest to downstream
<br />water users, and more recently, the subject of interstate regulation and
<br />control, Pre] iminary evaluations conducted for this study indicate the
<br />average annual )941-73 water resource for the Gunnison River Basin to be
<br />as follows:
<br />
<br /> 1941-73 Estimated
<br /> Drainage Annual Undepleted Consumptive 1941-73
<br />Locat ion Area Yield Supply Use Outflow
<br /> (sq.mi. ) ( in.) (ac.fL) \ii-c. f L ) (ac,fL)
<br />Uppe r Gunn i son 3,952.6 S,9 1,238,SOO 58,SOO 1,180,000
<br /> .
<br />Lowe r Gunnison 3,148.3 4.9 827,000 366,000 461 ,000
<br />Whitewater 919.1 2.S 106,Soo 20,500 86,000
<br />TOTAL GUNNISON
<br />RIVER 8,020.0 5.1 2,172,000 44S,oOO 1 , 72 7 , 000 ~
<br />
<br />003052
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