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<br />.' John D. Vanderhoof
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<br />May 6,' 1974
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<br />~~~MORANDUM
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<br />TO' :,,' ",' JERIS A. DANIELSON.,
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<br />; 'FROM: . ;'HAL SIMPSON:,
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<br />. ,SUBJECT: COLORADO WATER PROTECTIVE AND DEVELOPMENT
<br />ASSOCIATION'S PLAN ,OF AUGMENTATION
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<br />. Introduction .i ,r,; , ' ' , .~.. \
<br />Basically, the plan estimates thE! stream depletion resulting
<br />from the use of Association member wells and suggests several ways that
<br />the stream depletion may be augmented. As far as it can be determined,
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<br />,none of the possible sources of augmentaticm water can be consider.ed
<br />'.~'f1rm "and reliable~' All are continQent upon clgTeeme~~~ ,'.contracts, I:>r
<br />Dlvlston Water Court decisions. " '" ';,.' ,:' " ,
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<br />Analysis of Stream Depletion Calculations
<br />, The net irrigation water requiremlsnts ,for association lands were
<br />caiculated using the Modified Blaney-Criddle methOd and appear accurate,.
<br />" The' consumnt!ve use coefficient. (K) utilized. was the maximum value for'
<br />,::1 each crop a~ recommended in SCS Technical. Release No. 21. No con- '
<br />slderation was given to irrigation efficiencies and additional water losses
<br />that could result from inefficient water application. ", '
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<br />'I ':'" I,' The portion of the net irrigation requ!rementsuppl1ed by 'ground
<br />,: water was estimated u.sing a value of 20 percent,' This value was taken'
<br />, ,'from a publication by the USGS in Ground ",rater, January - February, 1974.
<br />: 'This factor' 1s significant and should be verified for Association lands. In
<br />,"~ reviewing the'membership list, Appendix A" it appears that the wells are
<br />. ': "', capable of irrigating the stated acreage ,in. most instances without l3urface
<br />":water. :'~"'" "" ,',h
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<br />'The total, amounts of surface water rights owned by Association,
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