7:25 Phone Water+Supply+HW . 5G+ HW-2 1. The City of Cort Follins has a demand of 1.67 m3/s for water supply from the Pache la Coudre River. If the Colorado Division of Water Resources limits the withdrawal from the river to 5 percent of the flow, determine (a) the size of the reservoir (m3) needed to meet the demand, based on the data provided below (m3/s). (b) Is the reservoir full at the end of the study period? (c) Are you confident of your reservoir sizing, explain your answer. Perform the calculations on an excel spreadsheet for the duration starting in June 2011 until the end of December 2013. *Assume the planned reservoir is full at the beginning of the study period, and no excess water can be stored. Hint: You are determining the maximum deficit. "Attach/upload the excel spreadsheet and answer the questions above and below on a separate document. Year Jan Feb Mar Apr May Jun Jul Aug Sep 2011 13.9 9.1 14.1 8.4 133.8 770.2 374-3 32.9 36.2 2012 17.7 11.5 10.2 26.4 70.9 46.5 45.0 40.2 21.6 2013 6.4 6.4 2.9 2.1 117.5 105.9 26.7 17.2 383.2 2014 32.2 33.3 50.9 67.2 503.2 676.6 92.0 62.7 31.1 Oct Nov Dec 22.0 25.3 21.0 16.2 2.1 4-5 51.6 57.5 43.9 42.8 51.9 40.5 2. A 42 m deep artesian aquifer with fine sand supplies water to City of Heartland through a well. The piezometric surface in the pumping well was observed as 92 m above the bottom confining layer, before pumping began. The pumping rate is 0.037 m3/s. After 1,696 days of pumping an observation well was drilled 184 m away from the pumping well. The drawdown in the observation well was 7.2 m. Calculate the drawdown at 63 m away from the pumping well. 3. A well in a 57 m thick unconfined aquifer with limestone is designed to lower the water table in the area where a solid waste landfill will be placed. The planned drawdown is 4-5 m below the original piezometric surface at a distance of 49 m from the pumping well. It is also expected that the piezometric surface will be lowered 7.5 m at a distance of 32 m away from the pumping well. Calculate the pumping rate (m3/s) that will achieve the desired drawdowns, at steady-state.

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7:25 Phone Water+Supply+HW . 5G+ HW-2 1. The City of Cort Follins has a demand of 1.67 m3/s for water supply from the Pache la Coudre River. If the Colorado Division of Water Resources limits the withdrawal from the river to 5 percent of the flow, determine (a) the size of the reservoir (m3) needed to meet the demand,