DWR_3538977 - Laserfiche WebLink

Ms.Megan Gutwein August 16,2019 Page 9 of 25 • The number of monthly time steps (URF period) for the URF will be limited to the number of months required for at least ninety percent of the impact to occur to the stream;the URFs will then be normalized by apportioning the remaining return flows across the URF period. The transmissivity6 was determined from the hydraulic conductivity of seven wells in the Arkansas River basin, two located between the Towns of Manzanola and Swink and three located between the Towns of Swink and La Junta (all in valley-fill deposits in the main valley) and three located in the Timpas Creek valley (valley-fill deposits), and the saturated thickness of wells located near the subject farms. The Well ID, Saturated Thickness (B), Transmissivity (T), and Hydraulic Conductivity (K) estimated for the eight wells are presented in the following Table 6. Table 6 Hydraulic Conductivity B T K Well ID Description (feet) (gpd per (gpd) foot) C-23-56-8ddc Manzanola to Swink 18.0 55,000 3,056 C-23-57-2ddc Manzanola to Swink 12.0 50,000 4,167 C-23-55-33bad Swink to La Junta 21.4 60,000 2,800 C-23-55-30bbc Swink to La Junta 28.0 115,000 4,107 C-24-56-18acb &18acb2 Timpas Creek 20.0 110,000 5,500 C-24-56-4cdc Timpas Creek 20.0 80,000 4,000 The K for the Diamond A,Schweizer, and Mameda Farms is the mean for the wells located between the Towns of Manzanola and Swink. The K for the Groves Farm is that of Well IDs C-23-55-30bbc, C-24-56-4cdc, and C-24-56-18acb and acb27. The K for the Mayhoffer Farm is that of Well IDs C- 23-55-30bbc, C-23-55-33bad, and C-24-56-4cdc, C-24-56-18acb and acb2. The saturated thicknesses (B) between the farms and the Arkansas River were determined via evaluation of well logs for wells located in the vicinity of the farms.The average B for wells grouped in the above categories was calculated, and the average of these values was used as the B for each Glover-Balmer analytical solution. Table 7 contains the well data and saturated thickness for each farm. USGS Ground Water Circular No. 11,Woodrow W.Wilson,United States Geological Survey, 1965. 'Since the two wells located at this location have the same transmissivity, saturated thickness and hydraulic conductivity,they were considered as one well for the purposes of this report to prevent skewing of the data. Martin and Wood Water Consultants,Inc.