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<br />DEPLETION OF SURFACE WATER SUPPLIES
<br />
<br />15
<br />
<br />
<br />gener~lly in the order of one-half of the depletion resulting from the
<br />service to new lands. If, therefore, one-half of the area of the lands
<br />given I;lupplemental service be added to the area of new lands in each
<br />project, the subsidies required for new land or its equivalent can be
<br />computed. The effect of doing so and of including the subsidy due
<br />to waiver of interest is shown in the following tabulation:
<br />
<br />Subsidies for Gunnison River projects
<br />A totail area of 189,000 acres is included within the 18' projects in
<br />the Gunl.)ison River Basin investigated by the Bureau of Reclamation
<br />during the past 10 years, of which about one-half is land now being
<br />irrigated lbut which would be benefited by the delivery of supple-
<br />mental Witter or regulation of existing supplies. The total construc-
<br />tion cost : chargeable to irrigation would be $90 million, an .average
<br />of $476 per acre of all land included in these projects.. .
<br />The required subsidy, disregarding the subsidy arising out of waiver
<br />of interes~, would be less than $200 per acre in the case of only 3
<br />projects having an aggregate area of about 20,000 acres. Subsidies
<br />exceeding :$300 per acre would be required to expand the area to
<br />60,000 acres, and if as much as 150,000 acres of new land and supple~
<br />mental service land were included in the projects, some subsidies
<br />would have to be as great as $500 per acre. The Bureau of Reclama-
<br />tion estiml\,tes that III the case of seven of these projects the water
<br />users could not pay all costs of operation and maintenance~
<br />When th,e subsidy due to waiver of interest is added, the relation
<br />between the required subsidy per acre of new land or its equivalen.t
<br />and the re$ulting depletion of the contribution by Gunnison River
<br />to the total flow. of Oolorado River is as shown on the following table:
<br />
<br />Relation of subsidies to depletion, main stem of Colorado River
<br />
<br />Total area of
<br />new land or
<br />equivalent
<br />
<br />Maximum subsidy per acre of new land or equivalent:
<br />$200._______._.__.__.____._._.__..____.______._____.__.______.____.__
<br />$400_ _... _ _. _. _' _ _____.. ___. _. ___ _ _ _ _____ _ __.. _ _c_ ____. __.. _ __ _. ____.
<br />$600. _ _ _ c_ _' _ _ _ __ ______ _. ____ _ ____ _ _ _____. _ ___. ___ _.m ___. _ __ _ _ _____
<br />$BOO___.._____._.._.______._____.____...____________._____..___.___._
<br />$1,000__+ __ __ _ __ __ _ ___ __ ___ ___. ____ __ _ __ __ _ __ _ _ __ _ __ __ _ ___ ___ __ _____
<br />
<br />Acres
<br />7,000
<br />62,000
<br />113,000
<br />130,000
<br />140,000
<br />
<br />Relation of subsidies to depletion Gunnison River Basin
<br />
<br />Resulting de-
<br />pletion of
<br />streamflow
<br />
<br />AcreMfeet pcr
<br />year
<br />10,000
<br />87,000
<br />158,000
<br />182,000
<br />196,000
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<br />Total area of Resulting de- . ,~ .
<br />new land or Eletlou of <.
<br />eqUivalent s reamftow :-'
<br /> ; .
<br />Acres Acre-Ieet per
<br />year
<br />6,000 8,000
<br />27 r 000 38, 000
<br />86,000 119,000
<br />125,000 175,.000
<br />140, 000 196,000
<br />
<br />Maximum subsIdt per acre of new land or equivalent: .
<br />$200_.____._.____._._.___._.__.______________,____.____.__..____,____
<br />$400_.__.._.__:______._________._._____.____._.._____________________
<br />$600_______.._.,_._.___._._.____.____________________.____._..__.__..
<br />$800____._.____.__._.._._____.______._.___._.______._____.__.___.__._
<br />$1,000___ _ _. _._.:. _ __ __. _' ___ __ _ _ ___. _ _ _ _ __ _. _ _ _ _ __ ____ .__.: __. _ ____ __
<br />
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<br />f."
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