WSPC06079

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

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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 parcel. This preliminary water cost was

based on the static pumping lift (the difference in elevation from

the water surface in the river to the elevation of the parcel) for

gravity irrigated fields or plus a field delivery pressure of 60 psi

for sprinkler irrigation. Detailed tabulations of the analysis are

shown in Appendix 0.1. Table D.4 identifies only those parcels with

a positive preliminary residual payment capacity requiring further

consideration. A total of 88 parcels covering 4,343 acres showed a

positive preliminary residual payment capacity.

An off-farm irrigation transmission system was designed for those

parcels near the Mancos River showing a positive preliminary

residual payment capacity shown in Table D.4. Those calculations

are shown in Appendix 0.2 and summarized in Table D.5. Parcels with

an initial positive payment capacity after comparing the residual

payment capacity to the cost of water were analyzed further for the

abi~ity to justify construction of a reservoir for storage of the

necessa.ry water supply. A total of 3,385 acres with an on-farm water

requirement of 7,700 acre-feet was identified in Table 0.5 to have an

initial positive payment capacity.

Many parcels in the Navajo Wash area had an initial positive payment
capacity even though the distance from the river was considerable.

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