WSP10998

• File Number: 8135.300
• Description: Ditch Companies - Catlin
• State: CO
• Basin: Arkansas
• Water Division: 2
• Date: 1/1/1975
• Author: Richard Luckey USGS
• Title: US Department of the Interior - Geological Survey - Hydrologic Effects of Reducing Irrigation to Maintain a Permanent Pool in the John Martin Reservoir - Arkansas River Valley - Colorado
• Water Supply Pro - Doc Type: Report/Study

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The results from each month of simulation are as follows:

1. Surface-water diversions for each canal.

2. Ground-water diversions under each canal.

3. Streamflow at the State line.

4. Change in ground-water storage by reach and side of the

river.

5. Contents of John Martin Reservoir and the amount of water

assigned to the permanent pool.

6. Return flow to the river and change in storage in the

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ground-water system for all future months due to operation during all

preceding months and the present month.

Assumptions

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The. si~t;l.3.tiar. ',.'25 dOTle t'oJic:e~ once undt2r non:.al opc.rati.cn .::J.~d c~ce

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with the proposed change in use of water. All data and operating procedures

were the same for both simulations except as noted below. The difference

bet>leen the simulations is a measure of the hydrologic effects of the

proposed change in ~ater use.

The Division of Wildlife has a right to 11.2" percent of the water

diverted by the Catlin Canal. Under the change in water use simulation,

11.24 percent of the direct diversion by the canal was assigned to the

Division. llowevcr, because this water was historically applied 35

irrigation water with resulting return f~ow, only the consumptive use of

this water was allowed to be transferred in this simulation. The

consumptive use was estimated to be 77 percent (Taylor and Luckey,
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1972) .

The remaining 23 percent of the water was returned to thc river

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-,-- -----+

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to replace the historical return flow.

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