Design a layout of stabilization ponds for the town of Nancy (Problem 12.31) based on the following criteria:
(1) BOD loading in the primary cells cannot exceed 25 lb/acre/day,
(2) minimum total water volume with the ponds full to a 5.0-ft depth in primary cells and 8.0- ft depth in secondary cells cannot be less than 120 days times the design flow.
(3) volume for winter storage above water depths of 1.5 ft should be sufficient so that no discharge is necessary for a 4-month period when the net water loss (evaporation plus seepage minus precipitation) is 1.0 in./month, and
(4) the system should have at least two primary cells and at least two secondary cells that cannot receive raw wastewater.
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