Inverts. 1. Brick and mortar or precast concrete invert. 2. Form and finish invert channel to provide a consistent slope from inlet(s) to outlet up to 4-inches. 3. Channel walls shall be formed to 3/4 of the height of the outlet pipe diameter. 4. Finish benches with a minimum uniform 1.5:12 slope. Provide a 1/4-inch radius at the edge of bench and trough.
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Sources: Sanitary Sewer System Specifications, Sanitary Sewer System Pressure, Sanitary Sewer System Specifications