(A) Public mains will be sized to serve the entire tributary area at build-out densities conforming to the District’s collection system capacity model. Engineers for large developments may be required to provide trunk or collection system calculations or have a wastewater model run performed.
(B) Design flows will be based on the following criteria:
(1) Population density for a single-family home shall be 210 gpd/ EDU;
(2) Peaking factor: A minimum peaking factor of 2.5 shall be utilized. For flows less than 0.45 mgd refer to chart in Figure 10-1 in § 33.351(D); and
(3) I/I equals 500 gpd/acre.
(C) Design all gravity sewers to achieve a minimum velocity of 2 fps at average dry weather flow (ADWF) and a maximum velocity of 10 fps using design flows. Velocities less than two fps require approval of the District. When analyzing the existing of proposed sewer systems, use Manning’s formula to determine the design flow and velocity. Use a Manning’s “n-value” of n equals 0.013.
(Ord. 2019-02, passed 4-25-2019)