WSPC04207

• File Number: 8064.100
• Description: Ute Tribes
• State: CO
• Basin: San Juan/Dolores
• Water Division: 7
• Date: 9/1/1986
• Author: CO Dept of Law
• Title: Agricultural Engineering Study - San Juan West Watershed - Task D-E Report - Step A - Design-Cost Estimate for Off-Farm Irrigation Facilities and PIA Determination
• Water Supply Pro - Doc Type: Report/Study

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1193

Off-farm irrigation transmission facilities were conceptually

designed for those parcels with preliminary payment capacities

greater than the off-farm water pumping costs. The pumping cost was

re-evaluated, added to the facilities cost, and compared to the

preliminary payment capacity.

To complete the PIA analysis, the cropping pattern and payment

capacities will be reviewed by the economist taking into account the

practicality of the cropping pattern for the particular parcel and

any agronomic costs that might be particular to the parcel. Several

iterations of this process between the economist and the engineer may

be necessary in order to develop the most economical parcel and

facilities layout. Those parcels that still exhibit positive

residual payment capacity after these further analyses are then

determined to be practicably irrigable.

D.2 SELECTION OF PARCELS FOR OFF-FARM DESIGN

Parcels to be considered for PIA analysis were identified in the Task

B Report along with on-farm irrigation costs. The Task B report

identified irrigation costs for handmove sprinkler, sideroll

sprinkler, gravity (furrow or basin) , center pivot, and center pivot

with sprinkler in the corners. Computer tabulation compared on-

farm ir r iga tion cos ts to the crop paymen t capac i ty for a sorn/soybean

crop rotation. The tall growth habit of corn rules out sideroll and

handmove sprinklers. As a result, parcels with a corn/soybean

rotation were evaluated with gravity and the center pivot system

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