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The slope of a horizontal drainage pipe shall be not less than that indicated in Table 704.1 except that where the drainage piping is upstream of a grease interceptor, the slope of the piping shall be not less than 1 / 4 inch per foot (2-percent slope).
Minimum Slope. All sewers shall be designed and constructed to give mean velocities, when flowing full, of not less than 2.0 feet per second, based on Manning's formula using an “n” value of 0.013. The following are the minimum slopes which shall be provided; however, slopes greater than these are recommended.
Charlotte Water may, on a case by case basis, allow high velocity/steep slopes for 8-inch sewer between 10% (0.10 ft/ft) and 19% (0.19 ft/ft) if all the following requirements are met: High velocity sewer mains shall only be 8-inch in diameter. Slopes greater than 19% are not permitted.
Minimum sanitary sewer slopes are established to provide a minimum cleansing velocity (usually 2 or 3 feet per second) at full flow or half-full flow. (The physics of hydraulic flow are such that a sloped pipe will carry flow by gravity half full at the same velocity as full.)
Sewer slope, also known as pitch, keeps liquids and solids moving at an appropriate speed in a gravity system; pipes must slope downhill to drain properly. If the slope is not steep enough, the sewage slows down, resulting in clogs.
According to the International Plumbing Code, drainage pipes should be run with a uniform slope at the following minimum pitches: Large Diameter Sewer Pipe Slopes. Large sewer lines require calculations to determine the proper pitch.
In most jurisdictions, the minimum pipe size for a gravity sanitary sewer system is an 8-inch diameter pipe. There are a variety of approaches to the maximum allowable flow depth in a sanitary sewer. In some jurisdictions, it is allowable for the pipe to flow full at peak hour.
704.1 Slope of horizontal drainage piping. Horizontal drainage piping shall be installed in uniform alignment at uniform slopes. The slope of a horizontal drainage pipe shall be not less than that indicated in Table 704.1.
However, certain minimum standards are typically required to ensure access to the sewer for maintenance. Typical manhole spacing ranges between 90 to 180 m (300 to 600 feet) depending on the size of the sewer and available sewer cleaning equipment.
All dead end sanitary sewer lines (i.e. cul-de-sacs) shall have a minimum slope of one percent (1%). Construction plans shall develop and show average flows, peak flows, and other information at all points of connection to the existing sanitary sewer system as follows: Q PEAK Peak Sanitary Sewer Flow Q AVG Average Sanitary Sewer Flow