(A) A drainage plan must be approved by the City Engineer, unless exempted by divisions (B), (C), (D), (E) or (F) below, before:
(1) Recording a plat or subdividing land;
(2) Altering, rerouting, deepening, widening, obstructing or changing the channel con- figuration in any way of an existing drainage system;
(3) Commencing development for subdivisions, shopping centers, commercial or industrial facilities; or
(4) Commencing any other development which may:
(a) Significantly increase or decrease the rate or quantity of stormwater runoff;
(b) Degrade the quality of water;
(c) Adversely affect any wetland, watercourse, or water body.
(B) For the purpose of this section, development within a subdivision shall not require approval of a drainage plan if each of the following conditions have been met:
(1) Drainage provisions for the subdivision were previously approved and remains valid as part of a final plat;
(2) The development is conducted in substantial accordance with the drainage provisions contained in the development plan submitted with the final plan for approval.
(C) Normal maintenance activities are exempt.
(D) A single family or duplex residential dwelling to be built and inhabited by the applicant may be excluded from the requirements of this subchapter upon determination by the City Engineer that such construction will not adversely impact on the drainage system.
(E) The City Council may grant a written variance from any requirement of this section using the following criteria:
(1) There are special circumstances applicable to the subject property or its intended use; and
(2) The granting of the variance will not:
(a) Significantly increase or decrease the rate or volume of stormwater runoff;
(b) Significantly contribute to the degradation of water quality;
(c) Otherwise significantly impair attainment of the objectives of this subchapter.
(F) An impervious surface may be excluded if less than five thousand (5,000) square feet is created, upon determination by the City Engineer that such construction will not adversely impact on the drainage system.
(Ord. 95-33, passed 8-24-95) Penalty, see § 174.079