WSP03823

• File Number: 8135.300
• Description: Ditch Companies - Catlin
• State: CO
• Basin: Arkansas
• Water Division: 2
• Date: 1/29/1976
• Author: D Helton R McCabe
• Title: Catlin Transfer Plan and John Martin Permanent Pool Operation
• Water Supply Pro - Doc Type: Report/Study

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0693

can be made so as to compensate for the additional
seepage and to eliminate injury to other appropriators.

The permanent pool operation would require daily accounting
of water in the conservation and permanent pools to maintain
the permanent pool at its proper size and to be sure that
proper stream flow releases are being made. The State En-
gineer would make deductions for transportation losses from
deliveries of permanent pool inflow resulting from this trans-
fer. Net evaporation would be calculated as described herein.
The permanent pool size would be calculated by adding the
permanent pool inflow to the previous days' permanent pool
storage and deducting the net evaporation.

During times when conservation storage is contained in John
Martin Reservoir, releases of storage water and river flow
would be made as provided in the Arkansas River compact.
During times when the conservation pool is empty, the proper
stream flow releases would be made by maintaining the perm-
anent pool at its proper size. Each day the reservoir's
storage, as determined by the reservoir staff gage, would be
compared with calculated permanent pool storage, and the
reservoir release rate would be adjusted to make the two co-
incide.

A computer study was done to see how the permanent pool would
have behaved with the recommended transfer plan during compact
years 1949-73. Computations were made on a monthly basis.
Permanent pool storage at the end of each month was determined
by adding the inflows and deducting the outflows. Inflows
were deliveries of storable water from Table 9. Outflows were
permanent pool evaporation and permanent pool spills. Perm-
anent pool evaporation was computed using pan evaporation and
precipitation measured at John Martin Dam from official National
Weather Service records and the most recent area-capacity table.
The monthly computations are shown in Appendix D.

Permanent pool storage is shown in Table 10; it would have
averaged 12,400 acre-feet. The maximum allowable storage of
15,000 acre-feet would have been attained during 10 of the 25
compact years. The minimum was 6,800 acre-feet, Thus, the
recommended transfer plan would provide an adequate permanent
poo 1.

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