What is the maximum allowable variation in orifice discharge rates within any one lateral?

The maximum allowable variation in orifice discharge rates within any one lateral being 10% reflects the need for uniformity and efficiency in septic system design and operation. When the discharge rates within a lateral are too varied, it can lead to uneven distribution of effluent, which may cause overloading in certain areas while others may become underutilized. This discrepancy can result in localized hydraulic failure, leading to potential issues such as system backup or even environmental contamination.

By maintaining a strict 10% variation, it ensures that all orifices are functioning similarly, promoting even distribution of effluent across the entire lateral. This standard helps to maximize the performance of the septic system, prevents over-saturation of soil in specific areas, and optimizes the treatment process to reduce the risk of malfunction or failure. Adhering closely to this limit is crucial for maintaining system effectiveness and longevity.