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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~1~e~tly

irrigated lands on Southern Ute Indian lands. W. W.

Wheeler & Associates, Inc., hydrology consultant, identified from

aerial photographs and other information available to them the lands

presently irrigated and provided to Boyle a marked print of the base

map. The amount of irrigated acreage was then planimetered from the

base map and tabulated. It should be noted that presently irrigated

land covers some land not classified and Class 6 (non-irrigable)

soils as determined by Stoneman-Landers, soil consultants.

For the remaining irrigable parcels, an analysis was made to

determine the residual water payment capacity when only the off-farm
static pumping lift costs where added to the on-farm costs identified
in Task B. Based on the elevation of the nearest water supply and the
elevation of the highest point in each parcel, the static lift to
serve the parcel was calculated using the computer program developed

for the Task B report. The pOlo/er cost to lift the annual water

requirement to each field was then calculated assuming a 75 percent

pumping plant efficiency Io/hich is a conservatively high assumption;

and a field delivery pressure of 60 psi for all but gravity irrigated

fields.

It should be noted that the parcel water payment capacity residual

analysis (Appendix D.I) was slightly modified from the analysis

presented in the Task B draft 'Cepo'Ct. Land leveling costs for

gravity irrigated fields Io/ere not included in the Task Bon-farm

costs. The Task B report, however, estimated land leveling

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