## Process Control Calculations Stabilization Ponds

Process control calculations are an important part of wastewater treatment operations, including pond operations. More significantly, process control calculations are an important part of state wastewater licensing examinations—you simply cannot master the licensing examinations without being able to perform the required calculations. Thus, as with previous sections (and with sections to follow), whenever possible, example process control problems are provided to enhance your knowledge and skill.

14.2.1.3.1 Determining Pond Area in Acres

43,560 ft2/ac

14.2.1.3.2 Determining Pond Volume in Acre-Feet it 1 f «a Volume (ft )

43,560 ft3/ac-ft

14.2.1.3.3 Determining Flow Rate in Acre-Feet/Day

Flow (ac-ft/day) = Flow (MGD) x 3.069 ac-ft/MG (14.3)

Note: Acre-feet (ac-ft) is a unit that can cause confusion, especially for those not familiar with pond or lagoon operations. 1 ac-ft is the volume of a box with a 1-acre top and 1 ft of depth—but the top does not have to be an even number of acres in size to use acre-feet.

14.2.1.3.4 Determining Flow Rate in Acre-Inches/Day

Flow (ac-in./day) = Flow (MGD) x 36.8 ac-in./MG (14.4)

14.2.1.3.5 Hydraulic Detention Time in Days

Hydraulic Detention Time (days) = (14.5)

J J Influent Flow (ac-ft/day)

Note: Normally, hydraulic detention time ranges from 30 to 120 days for stabilization ponds.

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