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<br />. <br />81 <br />I <br /> <br />1908 Effect of Excess Diversion on Run 5H/5R <br /> 5H/5R Foot/Acre of Excess Diversion <br />Item Baseline 0.1 0.2 0.3 0.4 0.5 1.0 <br />Total Bypass/Spi 11 12.4 12.1 11.8 11.5 11.3 11.0 10.0 <br />Total Return Flow 17.8 18.3 18.6 18.9 19.2 19.5 20.8 <br />Total Irrigation Shortage 10.4 10.6 11.0 11. 3 11.6 11.9 13.2 <br />Net Effect on J.M. inflow <br />compared to historic Model <br />reservoir operation (5H) 0.3 0.2 0.1 -0.1 <br />Net effect on J.M. inflow <br />compared to rehabilitated <br />Model reservoir operation <br />(5R) 2.7 2.6 2.5 2.4 2.2 2.1 1.4 <br />Several conclusions can be drawn from these results. <br /> <br />Ii <br />. <br />. <br />II! <br />. <br />Ii <br />1ft <br />. <br />II <br />. <br />. <br />. <br />. <br />n <br />wi <br />~ <br /> <br />1. Increased diversions produce additional return flow <br />but reduce bypass and spills. <br /> <br />2. Irrigation shortages of water to project lands are <br />substantially increased. <br /> <br />3. Excess diversion reduces the accretion to John Martin <br />Reservoir inflow (compared to historical Model operation) <br />and causes a dep 1 et i on when excess di vers i on exceeds about <br />14,000 acre-feet per year. Transfer of water out of the <br />Mode 1 Ri ght to the Joi nt Use account and storage of wi nter <br />water under the di rect flow ri ghts reduces the amount of <br />excess diversion at which a depletion occurs. <br /> <br />4. Excess diversion of above about 4,930 acre-feet wi 11 cause a <br />depletion of the inflow to John Martin Reservoir if done in <br />conjunction with transfers of water out of the Model Right <br />and storage of winter water under the Direct Flow Decrees <br />(compared to historical model operation). <br /> <br />5. If compared to the rehabilitated Model operation, no reason- <br />able amount of excess diversion will cause a depletion to <br />John Martin Reservoir inflow. <br /> <br />Based on the above it is clear that the District needs to establish procedures <br />to mon itor headgate di vers i on and 1 i mit them to an amount c lose to the idea 1 <br />requ i rements. Thi s wou 1 d accomp 1 i sh the dual purpose of e 1 i mi nat i ng any dep 1 e- <br />tion to John Martin Reservoir inflow and preventing injury to Project water <br />users due to increased shortages. <br /> <br />G. Storage of Flood Flows <br /> <br />Article III of the Operating Principles states that Trinidad Reservoir shall be <br />operated for flood control benefits in accordance with regulations prescribed by <br /> <br />45 <br />