What is the maximum allowable distance for the top of the gravel or gravelless pipe from the septic tank outlet?

The maximum allowable distance for the top of the gravel or gravelless pipe from the septic tank outlet is established to ensure proper drainage and function of the sewage system. When this distance is limited to a maximum of 1 inch, it helps prevent the risk of blocking the flow from the tank to the leaching field, facilitating effective effluent distribution.

Keeping the distance tight helps maintain the necessary pressure and flow characteristics needed for septic systems, allowing effluent to move freely into the gravel or gravelless pipe without creating back pressure or causing potential system failures. It also aids in minimizing the chance of septic odors escaping from the tank or complications during heavy rainfall events that might otherwise flood the area.

In contrast, larger distances could lead to inadequate effluent flow and may compromise system efficiency, which is why the 1-inch guideline is crucial in maintaining the overall health and operation of the private sewage system.