WSP01376

• File Number: 8142.700
• Description: Trinidad Project - Annual Operating Plans and Reports
• State: CO
• Basin: Arkansas
• Water Division: 2
• Date: 12/1/1988
• Author: US DoI BoR
• Title: Review of Operating Principles Final Report
• Water Supply Pro - Doc Type: Operating Principles/Plan

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Effect of Excess Diversion on Run 5H/5R
5H/5R Foot/Acre of Excess Diversion
Item Baseline 0.1 0.2 0.3 0.4 0.5 1.0
Total Bypass/Spi 11 12.4 12.1 11.8 11. 5 11.3 11.0 10.0
Total Return Flow 17.8 18.3 18.6 18.9 19.2 19.5 20.8
Total Irri9ation Shortage 10.4 10.6 11.0 11.3 11.6 11.9 13.2
Net Effect on J.M. inflow
compared to historic Model
reservoir operation (5H) 0.3 0.2 0.1 -0.1
Net effect on J.M. inflow
compared to rehabilitated
Model reservoir operation
( 5R) 2.7 2.6 2.5 2.4 2.2 2.1 1.4
Severa 1 conclusions can be drawn from these resu lts.

1. Increased diversions produce additional return flow
but reduce bypass and spills.

2. Irrigation shortages of water to project lands are
substantially increased.

3. Excess di vers i on reduces the accret i on to John Mart in
Reservoir inflow (compared to historical Model operation)
and causes a dep 1 et i on when excess di vers i on exceeds about
14,000 acre-feet per year. Transfer of water out of the
Model Ri9ht to the Joint Use account and storage of winter
water under the direct flow rights reduces the amount of
excess diversion at which a depletion occurs.

4. Excess diversion of above about 4,930 acre-feet will cause a
depletion of the inflow to John Martin Reservoir if done in
conjunct i on with transfers of water out of the Mode 1 Ri ght
and storage of winter water under the Direct Flow Decrees
(compared to historical model operation).

5. If compared to the rehabil i tated Mode 1 ope rat i on, no reason-
ab 1 e amount of excess di vers i on wi 11 cause a dep 1 et i on to
John Martin Reservoir inflow.

Based on the above it is clear that the District needs to establish procedures
to monitor headgate diversion and limit them to an amount close to the ideal
requirements. This would accomplish the dual purpose of eliminating any deple-
tion to John Martin Reservoir inflow and preventing injury to Project water
users due to increased shortages.

G. Storage of Flood Flows

Article III of the Operating Principles states that Trinidad Reservoir shall be
operated for flood control benefits in accordance with regulations prescribed by

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