Major stormwater systems shall be sized to carry the base flood without causing additional flood damage. Maximum flow depths shall be nine inches in streets, parking lots and driveways, except that parking lots and driveways intended for access only by commercial trucks may permit maximum flow depths of 12 inches. The maximum depth of flow in non-paved drainage easements shall be 12 inches. The tail water used for the major drainage system shall be the 10-year water surface elevation in the receiving system or, in the case of stormwater detention facilities the 2-year design water surface elevation plus one foot.
(Ord. 06-0383, passed 3-15-06)