921.24  STEEP SLOPE AND STREAM VALLEY PRESERVATION.
   (a)   Steep Slope Restrictions.  Buffer width determination: No dwelling or accessory building shall be constructed within ten feet of the top of a natural or man-made slope having a ratio between 3H:1V and 4H:-1V or within twenty feet of the top of a natural or man-made slope steeper than 3H:1V unless the City determines that appropriate protection measures are taken to ensure slope stability and avoid erosion. If the soil's natural angle of repose would necessitate a flatter slope than 4H:-1V, no dwelling or accessory building shall be constructed within ten feet of the stable top of the slope so determined. Sufficient soils and site information shall be provided to the City to verify the required buffer width.
   (b)   Stream Valley Preservation.  Conservation protection zone:  Areas within 25 feet of the normal stream’s edge with a watershed of 100 acres or more shall be designated “conservation protection zones” (CPZ) and shall be designated on the plat. Due to naturally occurring stream dynamics and potential change of stream boundaries, the CPZ shall be defined on the plat with consideration of the on-site conditions and the required 251 minimum offset from each edge. No encroachment within this section shall be permitted unless otherwise approved by the City Planning and Zoning Commission.
(Ord. 11-2001.  Passed 1-16-01.)