C153808 Feasibility Study

• Contract/PO #: C153808
• Contractor Name: Arkansas Groundwater Users Association
• Contract Type: Loan
• Water District: 14
• County: Pueblo
• Bill Number: ARA
• Loan Projects - Doc Type: Feasibility Study

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efficiency of 95 percent, and a maximum field irrigation efficiency of 75 percent. These values were
adopted from the Arkansas River Basin Study (Boyle, 1990).

For plan year 1997, AGUA's Excelsior Ditch credits are computed by multiplying the river headgate
diversions between March and November by the percentage of Excelsior Ditch water available to
AGUA (35.61 percent) by the 60.6 percent consumptive use factor. The long-term 1908 through 1985
average annual replacement credit (consumptive use credit) from the Excelsior Ditch is 812.6 acre-feet.
This was computed by multiplying the long-term (1908 through 1985) river headgate diversions of)
3,765.6 acre-feet per year between March and November, by the 35.61 percent interest in AGUA, by
the 60.6 percent consumptive use factor. The long-term average monthly diversions and associated
consumptive use yields are summarized below:

Mar Apr May Jun Jul Aug SeD Oct Nov Total
Avg. Monthly 66.1 159.4 500.7 1303.0 860.6 513.4 136.3 88.1 138.0 3765.6
Diversions (aD
Avg. Monthly 14.3 34.4 108.0 281.2 185.7 110.8 29.4 19.0 29.8 812.6
CU credit (aD

The replacement credits from the Excelsior Ditch are used to offset the 1997 projected depletions of
up to 6,853 acre-feet (RMC, September 8, 1997, Attachment A) in the Arkansas River between Pueblo
Reservoir and John Martin Reservoir.

B. Board of Water Works of Pueblo. Colorado Replacement Sources

AGUA has purchased a minimum of 3,000 acre-feet of transmountain or otherwise fully reusable water
from the Board of Water Works of Pueblo, Colorado (Pueblo) with the right to purchase an additional
3,000 acre-feet for a total of 6,000 acre-feet for plan year 1997. Four hundred forty-two acre-feet of
water purchased from Pueblo is for the benefit of the Booth Orchard Substitute Supply Plan, which is
administered by AGUA. This water may be from any reusable source owned by Pueblo, including
direct flow transmountain imports (Busk-Ivanhoe, Wurtz, Columbine, and Ewing); stored
transmountain water (the same sources reduced to storage in Pueblo, Clear Creek, Twin lakes, or
Turquoise Reservoir plus Twin Lakes water and Homestake water); changed water rights decreed for
augmentation use, including those of Pueblo's West Pueblo Ditch shares; and fully consumable

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