How is the size of a drainfield calculated in square feet?

The method for calculating the size of a drainfield involves understanding the relationship between the total wastewater volume generated and the soil's ability to absorb that wastewater. The correct answer highlights this relationship effectively.

To determine the appropriate size of a drainfield, it is essential to divide the total daily flow of wastewater, typically measured in gallons per day, by the soil acceptance rate, which indicates how much water the soil can effectively absorb over a given area. This calculation results in the necessary drainfield size in square feet to effectively handle the wastewater without causing saturation or failure.

For example, if you know the daily flow of wastewater generated by a residence and the soil type's acceptance rate, you can directly compute the required drainfield size. By ensuring the drainfield is adequately sized, you help prevent overloading the system and maintain the efficiency and effectiveness of the on-site sewage facility. This calculation is crucial for proper system design, ensuring both environmental protection and compliance with local regulations.