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<br />> <br /> <br />. <br /> <br />water will elso occur wi~hin the CuloruJo portion of the <br /> <br />Colorado besin. The db'Jvc: fact.s would appear tc, warrant 2,n <br /> <br />average consumptlvo use of 1.3 Bcrs-feet over 0 In~go ir:eigc- <br /> <br />ted area. <br /> <br />iVJ!:STERN SLOP!': RETURfJ FLO"I: In'li'etion histc'ry is repeatini; <br /> <br />itself in reference to return flow weters in the Western <br /> <br />Slope vall~~s when compe~ed wlth pcrf0rmancc of the olde~ <br /> <br />South P12tte and ~rk~nsas valleys of the EaEto~n Slope of <br /> <br />Colorado. Tho Westen; Slope i~ Cohrado' s young(;st irrig2ted <br /> <br />urea, and r~turn flow is cnly p2rti211y devdoped. Future <br /> <br />returns will increase when the soil r,'2.te~ table reashes :1(; <br /> <br />equilibrium 2nd the i~rlg~ted areas becomG more compact. F~r <br /> <br />~ <br /> <br />spec'illl S8Cp2gC mc:;asuremc'nts m2-d" by the Hydrcgrai';1ic Devel- <br /> <br />opoent of the State ~ngineer's of1iee during 1919 to 1921, <br /> <br />the annual return flow of certain ~estern Slope areas is, in <br /> <br />round figures, 300,000 acre-feet, subdivided as follows: <br /> <br />Troublesome Creek area in Middle Pa~k 10,000 <br />Plateau Creek, no~th side of Gl'a ndIlle sa , 30,000 <br />North Fork of GunnisJ.n;., Somerset to Hotch- <br />kiss, 38,000 <br />UnC'Jlilpahgre, Ouray to Delta, 190,000 <br />Grand Valley drains between Palisade <br />and Maclf, <br />La Plata River, Hesperus to ::itate Lihe, <br /> <br />25,000 <br />10,000 <br /> <br />acre-~';. <br />" " <br />" <br />" " <br />" " <br />" " <br /> <br />303,000 <br /> <br />" <br /> <br />" <br /> <br />The ir~igated area p~oducing this ret~rn is uncertain, <br /> <br />. <br />.~ <br /> <br />but approximately 200,000 acres. Since there ere over 600,000 <br /> <br /> <br />acres from which no return flow measurements have been made, <br /> <br /> <br />i~tis~saie to assume that the present retu~n flow waters of <br /> <br />D <br />