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By how much must the invert of the outlet tee be lower compared to the invert of the inlet tee in a precast concrete septic tank?

  1. 1 inch

  2. 2 inches

  3. 3 inches

  4. 4 inches

The correct answer is: 2 inches

In a precast concrete septic tank, the outlet tee's invert must be lower than that of the inlet tee by a specific measurement to ensure proper flow and gravity-based drainage of wastewater. The accepted standard for this difference is 2 inches. This 2-inch requirement helps maintain an appropriate hydraulic gradient, which is crucial for allowing wastewater to move efficiently from the inlet to the outlet. By having the outlet tee positioned lower, it aids in preventing backflow and ensures that any solids present in the effluent can settle appropriately before being discharged into the drain field. This is essential for the effective functioning of the septic system, as it helps to minimize the risk of clogs and allows for adequate treatment of the wastewater. Understanding these measurements is vital for installers to ensure compliance with regulations and to promote the longevity and efficiency of the septic system.