Calculate the drawdown

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Question 2: (a) A combination gutter section has the dimension W = 0.5 m, SL = 0.008 m/m, Sx= 0.02 m/m, and a = 0.05 m. The Manning roughness factor is 0.016. Determine the discharge in the gutter if the spread is 2.0 m. Estimate the flow intercepted by the curb opening inlet placed in the composite gutter if the inlet length is 1.75m. 

(b) Evaluate the spread and depth at the curb for a triangular gutter section carrying a design discharge of 0.09m3/s and having a uniform cross slope of 0.022m/m, Manning’s roughness of 0.015, and longitudinal slope of 0.014m/m. 

Question 4: A gravel-packed well with an effective diameter of 36 in is to be constructed in an aquifer with T = 2.6 x l04 gpd/ft and S = 2.3 x 10-5 . The design flow of the well is 1000 gpm. 

Calculate the drawdown at the well (use r which is the distance from the pumping well = 18 in) with total withdrawals from storage after (a) 1 min, (b) 1 h, (c) 1 day, (d) 1 month, and (e) 1 yr of continuous pumping, at design capacity. Repeat the calculations for r = 1m and 100m. (conversions: 1m3/d/m = 80.517 g/d/ft, 1 in = 25.4 mm, 1 gpm = 5.45 m3 /d)

Reference no: EM13343795

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