WSP11744

• File Number: 8111.805
• Description: Arkansas River Compact Administration - Keesee Ditch
• Basin: Arkansas
• Date: 1/1/1986
• Author: HRS Engineering
• Title: Keesee Ditch Change of Water Rights Vol 2 - Proposed Pan of Operation for Storage in John Martin Reservoir
• Water Supply Pro - Doc Type: Publication

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Calculation of Return Flow Oblii<ations

Return flow obligations will be calculated based on the Return Flow Factors
described in Figure 2.

Winter Season and Long-Term Return Flows are calculated based on the
previous year's diversions.

Short-term return flows are based on current-year diversions, and the effect
of each month's diversion is carried forward into subsequent months. The net
obligation in any month is the sum of Winter Season Returns, Long-Term Returns,
and a series of Short-Term Returns.

The accounting process described in Figure 2, in combination with the
diversion limitations described above, will produce the following results:

1) Return Flow Releases will average 1,487 acre-feet per year. (Figure
3 shows the accounting summary with average-year obligations indicated).
This is equivalent to the 1,373 acre-feet of historical summer season
return flows, plus 114 acre-feet of net wintertime accretion.

2) Summer "diversions" will average 4,413 acre-feet per season. When
John Martin Reservoir is operating on a flow-through administration,
daily diversion rates will be in accordance with the Keesee decrees.

When conservation storage is released into agreement accounts, the
Keesee account may accrue storage at a rate greater than its decreed
diversion rates, and in volumes greater than the monthly limitations
described in Table Ill. In this instance, the total amount released into
the agreement account will be allocated as diversions in subsequent
months, within the limitations described in Table Ill.

3)

The net depletive effect on the river will be: a diversion of 4,413
acre-feet supplemented by a return flow release of 1,487 acre-feet,
which equals 2,925 acre-feet of net depletion. As shown in Volume
1 of this report, this is the average annual historical depletion for the
Keesee Ditch.

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