In addition to Chapter 152, Surface Water Management, of this code, the following general and specific standards shall apply:
(A) General standards.
(1) When possible, existing natural drainageways, wetlands, and vegetated soil surfaces must be used to convey, store, filter, and retain storm water runoff before discharge to public waters.
(2) Development must be planned and conducted in a manner that will minimize the extent of disturbed areas, runoff velocities, and erosion potential and reduce and delay runoff volumes. Disturbed areas must be stabilized and protected as soon as possible and facilities or methods used to retain sediment on the site.
(3) When development density, topographic features, and soil and vegetation conditions are not sufficient to adequately handle storm water runoff using natural features and vegetation, various types of constructed facilities such as diversions, settling basins, skimming devices, dikes, waterways, and ponds may be used. Preference must be given to designs using surface drainage, vegetation, and infiltration rather than buried pipes and manmade materials and facilities.
(B) Specific standards.
(1) Impervious surface coverage of lots must not exceed 25% of the lot area, except as follows: lots less than 11,250 square feet may have impervious surface coverage of not more than the lesser of 2,812 square feet or 35% of the lot area if the Zoning Administrator determines that stormwater management practices mitigate for the increased impervious surface coverage.
(2) Impervious surface coverage of commercial and industrial lots must meet requirements of the applicable underlying zoning district.
(3) When constructed facilities are used for storm water management, documentation must be provided by a qualified individual that they are designed and installed consistent with the field office technical guide of the local soil and water conservation districts.
(4) New constructed storm water outfalls to public waters must provide for filtering or settling of suspended solids and skimming of surface debris before discharge.
(Ord. 110, passed 11-15-97; Am. Ord. 0408, passed 12-14-04; Am. Ord. 1401, passed 1-28-14) Penalty, see § 155.999