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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than 4 times the aver age resid ual paymen t capac i ty shown in Table 0.5
for the initially identified PIA parcels. Further, the spillway
cost for configuration 9A is 57 percent of the total reservoir cost
which dispels the concern over the spillway requirement being the
driving force. The apparent cost of storage exceeds the residual
ability to pay even if no spillway were required.

0.4.10 Simulated River Operations

A simple computer simulation model of the Mancos River was prepared

and the river was modeled for three scenarios:

o Operation of a reservoir at Site 9 to provide a full irrigation

supply to the initially identified PIA lands;

o Operation of a reservoir at Si te 9 to prov ide the min imum
irrigation supply which would meet an acceptable irrigation
shortage criteria; and

o Operation of the river without storage to determine the amount of

new PIA lands that could be supplied with a shorted supply

~eeting an acceptable irrigation shortage criteria.

The operating simulations of Cases I and II were performed to

determine the minimum size of reservoir required to provide a full

supply and to provide a lesser supply meeting a minimum acceptable

shortage criteria, respectively. The Case III simulations were

performed to determine what portion of the initially identified PIA

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