Load: 100,000 gallons/day
Conversion to SI units: 100,000 gallons/day × 3.785 liters/gallon = 378,500 liters/day = 4.3 liters/sec = 0.0043 m3/sec
Design load: 0.005 m3/sec
Hydraulic residence time (for more than 70% BOD removal): 20 days
Required volume of pond: 0.005 m3/s × 20 days × 86,400 sec/day = 8,640 m3
Design depth = 1.2 m.
Design area = 8,640 m3 / 1.2 m = 7,200 m2
Pond of rectangular dimensions: Length L = 100 m; Width W = 72 m.
Pond of square dimensions: Length L = 85 m; Width W = 85 m.
Mean January temperature: 20oC (assumed)
Minimum BOD removal: 76%
Effluent treated to close to secondary standard.
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