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 Copperas Cove
 Code of Ordinances
 Chapter 17.5. SUBDIVISIONS
 Appendix B. WASTEWATER DESIGN CRITERIA

  B.7 - Manhole Design.  

Latest version.

  • Manholes are required at the following locations:

    (a)

    a change in sewer main alignment, slope, pipe size, or pipe material;

    (b)

    sewer main junctions, including the point of force main discharge to a gravity main; and

    (c)

    the ends of sewer lines (no cleanouts will be allowed on public sewer mains).

    Maximum manhole spacing shall be in accordance with TCEQ requirements.

    Manholes shall have the following minimum sizing:

    (a)

    48-inch diameter for pipe connections 15-inch and smaller;

    (b)

    60-inch diameter for 18 to 24-inch mains;

    (c)

    72-inch diameter for 30 to 36-inch mains; and

    (d)

    84-inch diameter for mains larger than 36-inch.

    Manholes larger than the indicated minimum size or cast-in-place junction structures may be required to accommodate multiple pipe connections. Manholes larger than 60-inch diameter shall have eccentric cone sections.

    Manhole construction shall be pre-cast concrete or cast-in-place concrete. Fiberglass manholes may be used only in locations approved by the City. Manholes shall have resilient watertight pipe connections. The manhole base shall have a "U"-shaped channel to provide for a smooth flow of water and to carry the pipe slope through the manhole. For connecting pipes of the same size, an invert drop of 0.1-ft. across the manhole is required. Connecting pipes of different size should have a crown elevation match. In situations where conservation of available head is critical for pipeline design, a waiver from these requirements may be granted to allow pipe invert elevations that provide an energy grade line match, as supported by calculations using the sizes, slopes, and design flows for the connecting pipes.

    A drop manhole is required when the upstream pipe is more than 24 inches higher than the manhole invert. The drop pipe must be outside the manhole. The vertical drop shall not exceed 8 feet. Where the difference in elevation between the incoming sewer and the manhole invert is less than 24 inches, the invert should be filleted to prevent solids deposition.

    Testing of sewer manholes shall be in accordance with TCEQ requirements. Manholes will be lined, at the termination points of force mains and at locations required by the City, in accordance with City specifications.

(Ord. No. 2016-61, § 1(Exh. A), 10-13-16)