Rule 15-18-77-5.9.6 - DistributionThe inlet and outlet on the tank (septic tank or ATU) must be 4 inch Schedule 40 pipe for a minimum of 3 feet onto undisturbed soil. Once the outlet pipe has extended a minimum of 3 feet onto undisturbed soil, it can then be reduced to a minimum of 3 inch Schedule 40 pipe for the entire discharge line.
1. Gravity Fed a. Single point discharge: Gravity-fed discharge using a single point discharge line on 1% or greater slopeb. Distribution manifold: For gravity-fed multi-point discharge distribution by manifold, the level manifold must be constructed using flow diverting devices (Figure I) in such a manner to be self draining. Distribution box (Figure III): A distribution box may used for multi-point discharge. The distribution box must be installed level to ensure equal distribution of effluent. Outlet lines should have equal slopes for a minimum of 5 feet after leaving the D-box. The D-box should have a baffle wall, or some means of reducing the pressure from the inlet flow.2. Pressurized Distribution a. Distribution box (Figure III): A distribution box may used for multi-point discharge. The distribution box must be installed level to ensure equal distribution of effluent. Outlet lines should have equal slopes for a minimum of 5 feet after leaving the D-box. The D-box should have a baffle wall, or some means of reducing the pressure from the inlet flow.b. Distribution manifold (Figure IV): If effluent is to be delivered to a level manifold under pressure, the distribution system shall be designed to provide pressure at the point of discharge not to exceed 5 pounds per square inch. This can be achieved by pumping directly into the head of the manifold or into a baffled distribution box. Figure 1 - Gravity Fed Manifold
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Figure 2- Terrace Plant Beds
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Figure 3- Distribution Box
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Figure 4 - Pressurized Manifold
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15 Miss. Code. R. 18-77-5.9.6