Prehearing Statement of the Town of Dillon

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Case No. 86CW330 Page 4 Applicant will calculate the irrigation deep percolation amount by multiplying the amount of water delivered for irrigation that month by 0.15. There are delays between the delivery of water for irrigation and return to the Blue River drainage of 15% of that water. The irrigation return flows considered to accrue to the Blue River shall be calculated by applying the following monthly factors to the deep percolation amounts occurring in each month of the irrigation season: Month in Which Lagged Return Flows Occur Starting With Month of Application Factor Month 1 0.6 Month 2 0.2 Month 3 0.1 Month 4 0.1 These factors shall be multiplied by the deep percolation amount occurring in any given month to determine return flows in the month during which the Application occurred (month 1) and in months following the time of Application (months 2 through 4). Return flows in any given month shall be equal to the sum of return flows occurring from deep percolation during the month plus return flows occurring due to previous months deep percolation. As an example, a sample calculation showing how return flow credits shall be calculated is shown in Exhibit A. 12. Determination of Net Out-of-Priority Depletions: Net depletions shall be calculated on a daily basis by taking out-of-priority diversions made at the Dillon Blue River Intake and subtracting associated in-house use return flows from the Joint Authority Wastewater Treatment Plant and also subtracting outside use return flows as determined in ¶11 above. Unconsumed portions of Applicant's diversions at the Blue River Intake ,.return to the Blue River from the Joint Authority Wastewater Treatment Plant and as irrigation return flows. Flows from the Joint Authority Wastewater Treatment Plant accrue to the Blue River in the NE4 of the NE4 of §35, T4S, R78W of the 6th P.M., Summit County, Colorado. Irrigation return flows accrue to the Blue River at or above the confluence of Straight Creek and the Blue River in the SE', of §12, T5S, R78W of the 6th P.M., Summit County, Colorado. Depletions attributable to diversions under this decree will be determined by dividing the diversions under this decree by the total diversions made by the Applicant from all of its appropriations and multiplying the resulting quotient by the total depletions calculated pursuant to this paragraph. Net depletions then will be replaced by releases made from Old Dillon Reservoir to the Blue River as described in 18. 13. Stipulations. a. Applicant and the Colorado Water Conservation Board entered into a stipulation dated October 25, 1988, regarding their respective water court cases. Specifically, applicant has agreed to abide by the following relevant terms and conditions in the operation of this augmentation plan and exchange. . i. The maximum consumptive use of water from the Blue River under this plan for augmentation and exchange (Case No. 86CW330), the