WSP08437

• File Number: 8220.105.LJ
• Description: Navajo Reservoir
• State: NM
• Basin: San Juan/Dolores
• Date: 12/1/1983
• Title: Draft Hydrologic Determination - December 1983 - Water Availibility from Navajo Reservoir and the Upper Colorado River Basin for Use in New Mexico
• Water Supply Pro - Doc Type: Report/Study

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the formula, only annual values at Lees Ferry have been used. It is felt tbat

tbese data may be somewhat more accurate than the Virgin Flows mentioned above.

the formula along with the two hydrology data sets were computerized in order

to allow any combiuation of variables and values and tbeir effects on allowable

depletions to be examined. To validate the use of the formula in the present

study, succe.sful attempts to verify the previous (1965) studies were made.

These are di.cussed in tbe next section. After verification was obtained, runs

using the new period of record were made to determine values of allowable deple-

tions values by use of the formula, the values were further verified by rans

u.ing tbe Colorado River Shaulation System (CRSS) computer model.

Representative determination runs for the formula method and the model method

are presented in Tables 4 and 5 respectively.

B.

Discussion ~ Results

AD analysis of a shailar .tudy of Upper Basin depletion level by Tipton and

Kalmbach in July 1965, for tbe Upper Colorado River Commission revealed tbat

they too used the Bureau's Virgin Flows as a basis for the determination. In

essence, they used a shailar approach but solved the equation for Useahle

Storage. they did this using two delivery assumptions - 7.5 KAF and 8.25 KAF,

and varied the depletion level in each one. they then plotted Upper Basin

depletion vs. required storage. With an assumed available storage of 29.0 KAF,

their plotted curves yielded a 5.6 KAF depletion vith a delivery of 8.25 KAF to

tbe Lower Basin and 6.3 KAF with a delivery of 7.5 KAF. Using tbe computerized

foraula with the Virgin Flows, zero sbortage, 29.0 KAF of ,available storage and

a 7.5 KAF delivery, an allowable depletion of 6.3 KAF was derived; with a deli-

very of 8.25 KAF the depletion was comp~ted at 5.6 KAF tbuI verifying tbe Tipton

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