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• covering 30%of a parcel;for parcels within a Shoreland or <br /> Wetland Management District,storm water runoff shall be <br /> further limited to the amount of runoff generated under the <br /> same circumstances by impervious surfaces covering 25%of <br /> the parcel area. <br /> 1. For the purposes of this section,"improvements"does <br /> not include fences,retaining walls,planting beds,or <br /> other landscaping. <br /> 2. Effectively mitigating storm water runoff relies on <br /> technical analysis of building materials,soils,slopes,and <br /> other site conditions.In order to ensure adequate and <br /> ongoing mitigation of storm water runoff,improvements <br /> which would cause pavement or building footprints <br /> to exceed 30%(25%in a Shoreland or Wetland <br /> Management District)of a parcel's area shall require the <br /> property owner to: <br /> a. Receive a Residential Storm Water Permit from the <br /> City Engineer; <br /> b. Submit annual maintenance letters,documenting the <br /> ongoing,required maintenance of the storm water <br /> mitigation system;and <br /> c. Receive a Residential Storm Water Permit <br /> recertification inspections by Engineering Division <br /> IIIstaff every 5 years. <br /> D. Building Arrangement:Buildings may be organized in <br /> several ways,including the examples in this section. <br /> 1. Arranged along the street without a common open <br /> space,as is typical for most residential lots.Open space is <br /> provided on individual lots. ■ <br /> 2. Arranged around a common courtyard that faces the <br /> street(see diagram),with parking areas taking access <br /> off a shared drive to the side and rear of the buildings. ■ ■ <br /> The area of the courtyard is counted towards the overall <br /> density,toward lot coverage calculations,and as part of <br /> the lot area per unit. ■ ■ <br /> 3. Arranged along the street with a common open space <br /> area to the rear or side of the buildings,as is common <br /> in townhouse and multi-family developments.The open ■ ■ <br /> space area(s)for resident use is counted towards the <br /> overall density,toward lot coverage calculations,and as <br /> part of the lot area per unit. street <br /> 1004.10 Medium Density Residential (MDR)District <br /> A. Statement of Purpose:The MDR District is designed to <br /> provide an environment of varied housing types at an overall <br /> • density of 5 to 12 units an acre,including single-family <br />