(A) No building permit may be issued unless a stormwater management plan has been approved by the Floodplain Administrator.
(B) A stormwater management plan is not required when one of the following conditions are met:
(1) The permit is for an accessory structure less than 500 square feet in size;
(2) The permit is for a building expansion of less than 2,000 square feet in size;
(3) The subdivision or parcel of land already has a stormwater management system constructed in accordance with the city’s stormwater management regulations; or
(4) The permit is for a single-family residential house on a pre platted lot.
(C) Stormwater management plans must meet the following standards for a 100-year or 1% annual chance:
(1) Post-development run-off cannot be greater than pre-development run-off;
(2) Post-development stormwater shall not be discharged in greater volume or velocity at any particular point than would otherwise occur in its pre-development state;
(3) The sanitary sewer system must be protected from intrusion from stormwater runoff;
(4) Parking lots shall not retain or detain more than six inches of water; and
(5) City Building Official or Floodplain Administrator or Floodplain Manager may require a licensed engineer stamped set of plans on larger parcels or parcels with maximum sealed surface or parcels in high risk or flash flood areas. Generally engineered plans will be properties of greater than one acre.
(Prior Code, § 157.007) (Ord. 1561, passed 7-10-2007; Ord. 1686, passed 8-14-2012; Ord. 1704, passed 11-12-2013; Ord. 1718, passed 3-11-2014)