(A) A post-construction stormwater management plan shall be submitted to the City, on a form or format specified by the planning director, as part of any preliminary plat application or grading permit application; or building permit application that creates five thousand (5,000) square feet or more of impervious coverage. For any significant redevelopment, a post-construction stormwater management plan shall be submitted with the building permit application.
(B) For all development applications made after the adoption date of this Article, the post-construction stormwater management plan, at a minimum, shall include low impact development (LID) BMPs to provide for water quality control of the first one-half (½)-inch of runoff from the site. The City may also require this minimum control level for significant redevelopment that increases the amount of impervious area in a previously platted parcel. For significant redevelopment projects that do not require a grading permit or that involve an increase of less than five thousand (5,000) square feet of impervious surface area, BMPs for water quality control of the first one-half (½)-inch of runoff from the site are encouraged, but not required. For significant redevelopment projects that are characterized as additions or expansions, the Planning Director may determine that the required BMPs only be applied to the area of new development.
(C) The PCSMP shall include the design, locations, schedules, and procedures for inspection and maintenance of the selected BMPs. Temporary erosion and sediment control BMPs to be used during the construction process are to be addressed in the grading permit application. The BMPs for the PCSMP shall address the reduction of stormwater peak discharges after development of the subject parcel to pre-development conditions for two (2)-year, ten (10)-year, and one hundred (100)-year return frequency storm events and shall include LID BMPs to provide for water quality improvements in the first on-half inch of runoff from the site. Refer to the Omaha Regional Stormwater Design Manual for information on BMPs. (Ord. No. 960, 5/16/17)
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