R309-545-13. Tank Overflow

  All water storage tanks shall be provided with an overflow that discharges at an elevation between 12 and 24 inches above the ground surface or the rim of the receiving basin. The discharge shall be directed away from the tank and shall not cause erosion.

  (1) Diameter.

  Overflow pipes shall be of sufficient capacity to permit waste of water in excess of the filling rate.

  (2) Slope.

  Overflow pipes shall be sloped for complete drainage.

  (3) Screen.

  Overflow pipes shall be screened with No. 4 mesh non-corrodible screen installed at a location least susceptible to damage by vandalism.

  (4) Visible Discharge.

  Overflow pipes shall be located so that any discharge is visible.

  (5) Cross Connections.

  Overflow pipes shall not be connected to, or discharge into, any sanitary sewer system.