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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the highest net agricultural return for each climatic zone is used.
Off-farm irrigation transmission facilities were conceptually
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des igned for those parcels with pr eliminary payment capac i ties
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

i tera t ions of th i s process between the economist and the eng ineer 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 R~port 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 irrigation costs to the crop payment capacity for corn/soybean

and alfalfa/malt barley crop rotations. The tall growth habit o~

corn rules out the use of surface sprinkler systems such as handmove

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