§ 27.5-122. Post-construction stormwater management plan.

[a.]

The post-construction stormwater management plan shall be submitted to the planning department for transmittal to the director, as part of any preliminary plat application required under section 13-3 of the City Subdivision Regulations. If not already submitted as part of a preliminary plat process, a post-construction stormwater management plan shall be submitted to the director for any activity requiring a permit under section 27.5-101, at the same time the application for a City of Bellevue grading permit is submitted. For any significant redevelopment that does not require a permit under section 27.5-101, a post-construction stormwater management plan shall be submitted along with the permit application for any activity requiring a building permit under the Uniform Administration Code, section 8-18.5

[b.]

For all development applications made after the adoption date of the ordinance from which this chapter is derived, 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 inch of runoff from the site and shall maintain the peak discharge rates during the two-year storm event to baseline land use conditions, measured at every drainage outlet (stormwater discharge) from the new development or significant redevelopment. The director shall also require this minimum control level for replats that significantly increase the amount of impervious area in a preliminarily platted subdivision, which was approved by the city council prior to July 1, 2008.

[c.]

For all developments with plats preliminarily approved by the city council prior to the adoption date of the ordinance from which this chapter is derived and for any sites requiring a permit under section 27.5-101 and for significant redevelopment projects, the post-construction stormwater management plan, at a minimum, shall include the BMP or BMPs selected, the BMP design, schedules and procedures for inspection and maintenance of the BMPs, and for any sites requiring a permit under section 27.5-101 and where it is reasonably practicable, include BMPs for water quality control of the first one-half inch of runoff from the site. Provisions for BMPs are set forth in the Omaha Regional Stormwater Design Manual. For significant redevelopment projects that do not require a permit under section 27.5-101 or that involve replacement of building structures without significant disturbance of existing parking or other pervious areas, BMPs for water quality control of the first one-half inch of runoff from the site shall not be required. For significant redevelopment projects involving an outlot parcel that is part of a greater existing development, the calculation of the area requiring control of the first one-half inch of runoff shall be based only on the impervious area of the project site that is being added or disturbed within the outlot parcel.

(Ord. No. 3409, § 1(32-122), 7-24-2006; Ord. No. 3490, § 2, 1-1-2009; Ord. No. 3562, § 2, 3-8-2010)