What is the maximum length of distribution lines from the manifold to avoid excessive pressure loss?

The correct choice regarding the maximum length of distribution lines from the manifold to avoid excessive pressure loss is 70 feet. This length is significant in the design of on-site sewage facilities because it helps ensure that the system operates efficiently. When distribution lines are too long, the friction and resistance within the pipes can lead to a decrease in pressure, affecting the proper irrigation and distribution of effluent throughout the drain field.

Maintaining a maximum length of 70 feet helps to mitigate pressure loss and ensures that the effluent is evenly distributed, which is essential for the effective functioning of the system and the prevention of potential system malfunctions or failures. Proper design and planning of these lines are crucial components in the installation and maintenance of OSSFs, as they directly influence the overall performance and longevity of the system.