CSV.7.5.050 Impervious Surface Limitations

(a) Extensive research shows that shoreland development results in increased quantities and velocities of runoff that may overwhelm infiltration capacity and transport sediment, nutrients and other pollutants directly to surface waters if proper management is not employed.

(b) The maximum total area of impervious surfaces shall not exceed fifteen percent (15%) of a total shoreland lot area within 300' of the ordinary highwater mark.

(c) The limitation on impervious surfaces may be increased to no more than twenty percent (20%) only with the submission of an application and approval of the Lac Courte Oreilles Conservation Department. The application shall include, at a minimum, the following documentation:

(1) A topographic survey of sufficient scale (not less than 1" = 20') showing pre-construction and pre-excavation conditions including slopes/contours, water bodies, wetlands, vegetative cover, drainage ways, roadways, buildings and all other impervious surfaces and any unique physical features of the lot.

(2) A site plan of similar scale showing the information required in (a) as proposed post-construction conditions, and shall include all erosion/sedimentation control measures, diversion/containment structures and total calculations of lot area and impervious surfaces.

(d) The limitation on impervious surfaces located more than 300 feet from the ordinary high-water mark may be increased to no more than twenty-five percent (25%) only with the submission and approval of the Lac Courte Oreilles Conservation Department of a Rainwater/Snow Run-off Retention Plan containing the same information required in 2(a) and 2(b).