What must the squirt height difference not exceed between orifices on any one lateral?

The squirt height difference between orifices on any one lateral should not exceed 21%. This specification is crucial for the efficient functioning of the septic system. When the squirt height difference is within the recommended limits, it ensures that the distribution of effluent is uniform across the lateral lines. This uniformity helps in avoiding potential saturation of certain areas while underutilizing others, which can lead to system failure or decreased efficiency.

Keeping the squirt height difference at or below 21% ensures that all parts of the lateral receive an appropriate amount of effluent, facilitating proper treatment and absorption into the soil. This regulation is based on maintaining optimal hydraulic performance and ensuring that the treatment process is effective throughout the entire lateral system.

While other percentages may be provided in the choices, they are either higher than what the guidelines allow, which could result in uneven distribution and potential issues with system performance and integrity.