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Holcim South Platte Combined SWSP September 18, 2025 <br /> Plan IDs 3614, 4773, 3624, 4772, 4616, 3437, 3376, 3650, 3668, 5475, 5829, &t 6243 Page 15 of <br /> 37 <br /> Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual <br /> 0 0 0.22 3.40 35.24 53.76 79.64 38.93 11.86 1.15 0 0 224.21 <br /> Subsurface return flows were lagged to the river using the AWAS stream depletion model <br /> with the following parameters: <br /> • Distance from the centroid of the irrigated property to the river (X) = 800 ft <br /> • Alluvial aquifer width (W) = 9,300 ft <br /> • Specific yield (S) = 0.2 <br /> • Transmissivity (T) = 50,000 (gpd/ft) <br /> The resulting return flow factors are shown in Table F below. <br /> Table F- Monthly Surface Water (SW) and Groundwater (GW) Return Flow Factors (%) <br /> Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec <br /> SW 0 0 50.0 22.50 36.15 30.32 30.98 22.50 22.50 22.50 0 0 <br /> GW 0.71 0.61 0.56 0.63 2.70 4.73 6.99 5.64 3.19 1.79 1.14 0.87 <br /> The monthly groundwater return flow requirements will be determined by multiplying the <br /> monthly groundwater return flow factor by the total delivery during the previous 12 months. <br /> Monthly results shall be divided by the number of days in that month to determine the daily <br /> groundwater return flow obligation. The daily surface water return flow requirement will be <br /> determined by multiplying the daily delivery of the 1.5 Smith 6t Emmons shares by the <br /> monthly surface return flow factor. <br /> Water associated with the 1.5 Smith 6t Emmons shares and water diverted under free river <br /> conditions will be delivered to the Lighthouse Cove Pond (WDID 0603018) for recharge. <br /> There is an existing return structure to measure deliveries to the Pond. The water <br /> commissioner approved the structure on May 16, 2023. The Applicant may not claim <br />