For an excavation size of 5x6, what would be the resultant drainfield size?

To determine the resultant drainfield size from an excavation size of 5x6, you need to understand how the dimensions of the excavation relate to the required size of the drainfield.

In general, the dimensions of the drainfield are typically larger than those of the excavation to ensure adequate filtering and treatment of the wastewater. The selected size needs to accommodate the necessary soil absorption and comply with health and safety standards for effective wastewater management.

In this case, an increase in both dimensions is necessary to provide the proper surface area for wastewater treatment. The dimensions 7x8 would yield a total area of 56 square feet, which suits the requirements better than other options by ensuring that there is enough space for the proper functioning of the system. A drainfield that has these dimensions allows for more adequate soil contact and absorption of effluent, which is crucial in preventing contamination and ensuring that the system operates effectively.

By selecting these larger dimensions, it reflects a common practice in OSSF design, aiming to prevent potential oversaturation and to ensure that the surrounding soil has ample capacity to treat the effluent being processed.