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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />1507 <br /> <br /> <br />the initially identified new PIA parcels would not be sufficient to <br /> <br /> <br />support the additional off-farm cost for storage of water. <br /> <br /> <br />Therefore, the Mancos River was operated in Case III to determine if <br /> <br /> <br />any portion of the new PIA parcels could be supplied from the river <br /> <br /> <br />without storage and without shortages that exceeded the adopted <br /> <br /> <br />acceptable shortage criteria. For the Case III simulations, it was <br /> <br /> <br />assumed that the acres of new PIA lands supplied would be directly <br /> <br /> <br />proportional to the irrigation demand; i.e. 50 percent of the total <br /> <br /> <br />irrigation demand used in Cases I and II, would supply 50 percent of <br /> <br /> <br />the initially identified new PIA lands, etc. The streamflows used <br /> <br /> <br />for the Case III simulations consisted of the virgin flows excluding <br /> <br /> <br />short-term runoff on the l1ancos River near Highway 666 Gage (Point 19 <br /> <br /> <br />on Figure D-ll). The mainstem of the Mancos River was simulated by <br /> <br /> <br />subtracting from the virgin flows: first, the estimated stream <br /> <br /> <br />losses due to phreatophytes for the mainstem above Highway 666; <br /> <br /> <br />second, the average irrigation requirement for the. existing <br /> <br /> <br />irrigated PIA parcels along the mainstem; and third, the estimated <br /> <br /> <br />stream losses due to phreatophytes for the mainstem between Highway <br /> <br /> <br />666 and Aztec Wash. The remaining streamflows were the flows <br /> <br /> <br />available to supply the initially identified new PIA parcels. They <br /> <br /> <br />were subtracted in successive runs from lOO, 75, 50, 25, and 5 percent <br /> <br /> <br />oE the average irrigation requirement for the new lands to determine <br /> <br /> <br />the shortages in supplying those portions of the initially <br /> <br /> <br />identified new PIA. Annual summaries for the five Case III <br /> <br /> <br />simulations are contained in Appendix D.3. Not even 5 percent of the <br /> <br /> <br />new PIA lands can be supplied without exceeding the adopted <br /> <br />32 <br />