WSP07339

• File Number: 8141.700
• Description: Fryingpan-Arkansas Project - Annual Operating Plans and Reports
• State: CO
• Basin: Arkansas
• Water Division: 5
• Date: 11/1/1975
• Author: US DoI BoR
• Title: Annual Operating Plan Fryingpan-Arkansas Project Colorado 1975 -1976
• Water Supply Pro - Doc Type: Annual Report

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most p~obable conditions, the amount would be 18,600 acre-feet. The
amount of water available to the District is that in excess of the
buildu~ storage necessary to operate the Project.

All releases are coordinated so the releases from Turquoise Lake do not
exceed the safe channel capacity of 400 c.f.s. in Lake Fork Creek. If
more than 400 c.f.s. release is required, the excess water will be
released from the conservation pool of Pueblo Reservoir. Table 5 and
Exhibit 9 show the proposed operation of Turquoise Lake in water year
1976.

Pueblo Reservoir

Reservoir Inflow

Inflow to Pueblo Reservoir is broken into two sources: (1) natural flow
is considered the native flow of the Arkansas River at Pueblo Dam plus
upstream reservoir water being passed downstream and (2) Project water
for sto~age in Pueblo Reservoir.

Upstream reservoir water, including Project water sold to the Southeastern
Colorado Water Conservancy District, is a small percent of the total flow
of the Arkansas River at Pueblo Dam and is considered as part of the
natural flow.

A probability curve for the natu~al inflow to Pueblo Reservoir was
computed by the modified California method and is shown graphically on
Exhibit 3.

Annual inflow of a magnitude equaled or exceeded 50 percent of the time
was considered the most probable inflow; that with a 90 percent chance
of being equaled or exceeded was considered to be the reasonable minimum;
and that with only a 10 percent chance of being equaled or exceeded waS
considered the reasonable maximum.

The annual inflow was distributed monthly according to the averages
based on historical records for the years 1955 through 1974.

Winter Water Storage Program

Fryingpan-Arkansas Project operating plans have always envisioned a
Winter Water Storage Program. The winter of 1975-1976 will mark the
initial trial Winter Water Program. The three-month program adopted
for this trial was developed by the Division Engineer, Colorado Water
Division No.2 in cooperation with the 'Southeastern Colorado Water
Conservancy District and the Bureau of Reclamation. The plan, to be
operated during the months of December, January, and February, require
that all the ditches below Pueblo and above John Martin agree to let
the plan operate, but only those ditches that desire need participate.

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