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Finally, for reservoir storage, the downstream return flow is augmented by the reservoir <br />release, or: <br />net returnFlow = net returnFlow + res release. (3-33) <br />4. Model limitations and key assumptions <br />Key model assumptions are: <br />For ag transfers, users can transfer the farm headgate water when retiring ag <br />lands. In other words the amount of water rights acquired depends on how much <br />the farmer was getting at his headgate, which includes water that is lost on the <br />farm or returned from the farm. The ag efficiency can be thought of as the <br />consumed water divided by the headgate water. Note that the farm headgate water <br />is generally less than the actual water diverted from the source (i.e. the river <br />headgate water), which includes ditch loss (from river to farm headgate). <br />- Users only gets consumptive use credits for the water consumed on the farm, not <br />the headgate water. <br />- For non-Ag acquisition, all water is 100% consumable. <br />- Percent reuse for irrigation and exchange/augmentation, as well as the percent <br />return flows associated with these reuse options, are assumed constant through the <br />year. <br />- The percent CU in usage does not change during times of shortage. <br />- The yields from reuse programs are realized immediately (i.e. there is no lag from <br />initiating reuse to when additional water is actually available). <br />- Recaptured reuse (effluent) is only used for irrigation. <br />11 <br />