2026-01-29_HYDROLOGY - M2016030 - Laserfiche WebLink

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2025-2026 Valley's Edge Resource Substitute Water Supply Plan Renewal Page 3 of 10 January 29, 2026 Brighton, CO and consist of net evaporation from exposed groundwater surface area, dust control, and water retained in removed product. No dewatering will occur during this period. Evaporation The Applicant proposes to replace evaporation from exposed groundwater at the site based upon evaporation atlases in NOAA Technical Report NWS 33 and the precipitation at the Brighton station, as shown in attached Table 1. Gross annual evaporation at the gravel pit location is estimated to be 45.00 inches per year. Net evaporation is defined as gross evaporation less the consumptive use of water by vegetation that naturally occurred at the site prior to construction of the pit. The precipitation (14.04 inches)was estimated based on the data from the Brighton NOAA weather station and the effective precipitation was estimated as 70%of the total precipitation. The exposed surface is currently 16.0 acres. Therefore, the net evaporation from the exposed water surface is estimated at 46.91 acre- feet for this SWSP approval period, as shown on attached Table 1. Dust Control The Applicant estimates that the water used for dust control will be 3.60 acre-feet for this SWSP approval period, as shown on attached Table 1. Mined Product The Applicant does not anticipate any further significant mining at this point; however, some remaining product is anticipated to be recovered. No water is anticipated to be retained in removed product for this SWSP approval period, as shown on attached Table 1. The total consumptive use is estimated at 50.51 acre-feet during this SWSP approval period, as shown on attached Table 1. Lagged Depletions A Glover analysis using the Integrated Decision Support Alluvial Water Accounting System (IDS AWAS) stream depletion model was used to determine the lagged depletions to the