WSPC01131

• File Number: 8064.100
• Description: Ute Tribes
• State: CO
• Basin: San Juan/Dolores
• Water Division: 7
• Date: 6/1/1987
• Author: CO Dept of Law
• Title: Agricultural Engineering Study - Navajo Watershed - Final Report - Design-Cost Estimate for Off-Farm Irrigation Facilities and PIA Determination
• Water Supply Pro - Doc Type: Report/Study

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Therefore, it was not necessary to perform any operational studies

involving storage reservoirs.

D.4.3 Cropping Pattern

For the preliminary analysis of PIA, a cropping pattern with the

highest net agricultural returns was used. Table D.2 identifies

this cropping pattern as well as the net agricultural return. The

parcels in the Navajo Watershed are located in climatic zone J.

D.4.4 Preliminary PIA Analysis
A preliminary PIA analysis was performed comparing a parcel's
payment capacity with a preliminary estimate of the cost to pump
water from the river to the pat'cel. This preliminary watet' cost was
based on the static pumping lift (the diffet'ence in elevation from
the water sut'face in the t'iver to the elevation of the parcel) for
gt'avity irrigated fields or plus a field delivet'y pressure of 60 psi
for sprinkler irrigation. The Navajo River, which would supply
water to the pat'cels in the Navajo watershed, is located to the east

and south of the Southet'n Ute Reset'vation. The water surface

elevation was taken at the point in Colorado where the river comes

closest to the reset'vation. The water surface elevation at this

location is higher than a point further downstream in New Mexico that
would be closer to the t'eservation lands. Detailed tabulations of
the analysis are shown in Appendix D.l. None of the parcels in the
Navajo Watershed had a positive t'esidual payment capacity. Table
D.3 summarizes the results of the analysis.

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