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<br />
<br />o
<br />
<br />) . EUMMARY
<br />....:
<br />e.O
<br />~ A total o~ 1,621,500 acres or 2 percent o~ the land area of the re-
<br />gion was irrigated in 1965 and 7,058,600 acres of potentially irrigable
<br />land (10 percent of area) are suitable for irrigation. The annual modi-
<br />fied outflow of water from the region for 1965 development conditions
<br />averaged 12,064,000 acre-feet.
<br />
<br />"Regionally Interpreted" OBERS objectives were used as a basis for
<br />the framework plan and appraised orop production needs consistent with
<br />livestock output projections by utilizing the region's resouroes and de-
<br />. termined land acreage and water requirements for irrigation, as follows:
<br />
<br />Irrigated land (1,000 acres)
<br />On-site water depletions
<br />(1,000 acre-~eet)
<br />
<br />1965
<br />1,622
<br />
<br />2,128
<br />
<br />1980
<br />1,794
<br />
<br />2,653
<br />
<br />2000
<br />1,954
<br />
<br />2,982
<br />
<br />2020
<br />2,122
<br />
<br />3,294
<br />
<br />To satisfy "RI" OBERS framework plan requirements ~or irrigation by
<br />2020, 587,400 acres of new land will need to be developed--including
<br />86,800 aores to replace irrigated land abandoned or converted to other
<br />uses. A total of 421,100 acres of short-supply irrigated land will be
<br />provided supplemental water.
<br />
<br />Alternate levels o~ irrigation development in the region are as
<br />follows:
<br />
<br />Level of development
<br />
<br />OBERS, "As published"
<br />"Regionally Interpreted" OBERS
<br />State alternative (6.5 MAF)
<br />State alternative (8.16 MAF)
<br />State alternative (water
<br />available)
<br />1/ Estimated.
<br />
<br />Sufficient land and water for irrigation are available within the re-
<br />gion to meet all needs projected in the development levels. The latter,
<br />alternative will require augmentation of water to meet Colorado River Com-
<br />pact requirements. For larger developments, land is available but sub-
<br />stantial augmentation would be required to satisfy demands within the re-
<br />gion as well as downstream.
<br />
<br />Irrigated acreage
<br />(1~000 acres)
<br />19 5 .. 2020
<br />1,622 1,551
<br />1,622 2,122
<br />1,622 2,118
<br />1,622 2,354
<br />
<br />1,622
<br />
<br />2,579
<br />
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<br />
<br />On-site
<br />(1,000
<br />1965
<br />2,128
<br />2,128
<br />2,128
<br />2,128
<br />
<br />2,128
<br />
<br />depletions
<br />acre-feet) .
<br />2020
<br />1/2,200
<br />- 3,294
<br />3,297
<br />3,658
<br />
<br />4,089
<br />
<br />I!
<br />
<br />l'
<br />
<br />Installation cost for irrigation, including system improvement, drain-
<br />age, and irrigation's prorated share of storage and major distribution
<br />systems, will total $857 million by 2020 under the "RI" OBERS ~ramework
<br />plan.
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