Stabilization pond computations are required for the town of Nancy (Problem 12.31).
(a) Calculate the lagoon area required for a design loading of 40 lb of BOD/acre/day.
(b) Determine the percentage of the average design flow that appears as effluent from the lagoons, assuming a water loss from the ponds of 60 in./yr (seepage plus evaporation minus precipitation),
(c) Using the water-balance data from part (b), calculate the BOD removal efficiency if the average BOD concentrations in the influent and effluent are 250 mg/l and 25 mg/l, respectively,
(d) How many acres of cropland are needed to dispose of the effluent by spray irrigation if the application rate is 2.0 in/week year-round?
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