1207.01   MAXIMUM IMPERVIOUS SURFACE COVERAGE.
   (a)   Maximum Impervious Surface Coverage.
      (1)   Single-family residential uses. The maximum impervious surface coverage for any residential property, including parking areas and accessory buildings and structures, shall not exceed forty percent of the total gross area of the underlying lot or lots, as determined by the Community Development Department, unless storm water management, existing conditions, or other techniques approved by the City Engineer to control storm water and runoff are employed, but in no case shall the impervious surface coverage exceed sixty percent of the total gross area of the underlying lot or lots. A survey of the property may be required to verify the impervious surface coverage of the property.
      (2)   Planned developments. The maximum impervious surface coverage, including parking area and accessory buildings and structures, shall be determined on a case-by-case basis based on the criteria set forth in division (b) of this section.
      (3)   All other non-residential uses. The maximum impervious surface coverage for commercial, industrial, and institutional uses shall be determined on a case-by-case basis based on the criteria set forth in division (b) of this section, but in no case shall the maximum impervious surface coverage exceed sixty percent of the total gross area of the underlying lot or lots except for the following:
         A.   The impervious surface coverage in District 5 for commercial/retail buildings may not exceed eighty percent and for single-family attached, townhomes, and multi-family residential may not exceed seventy-five percent.
         B.   The impervious surface coverage in the District 7 Overlay may not exceed fifty percent.
         C.   The impervious surface coverage for development in Districts 6 and 8 may not exceed seventy-five percent.
   (b)   Criteria for Establishing Impervious Site Coverage and Limits of Disturbance. In establishing maximum impervious surface and limits of disturbance, the following criteria and standards shall be considered and applied:
      (1)   Minimize visual impacts from the development, including but not limited to screening from adjacent properties and protection of scenic views.
      (2)   Preservation of significant trees or vegetation. (See Section 1207.02, Tree and Vegetation Protection.)
      (3)   Erosion prevention and control, including but not limited to protection of steep slopes and natural drainage channels. (See Section 1207.02, Tree and Vegetation Protection; Section 1207.03, Wetland/Stream Corridor Protection; and Section 1207.07, Stormwater Management/Drainage/Erosion Control.)
      (4)   Protection of aquifer recharge areas, and in particular areas lying within the one-mile and five-mile time of travel limits for the City of Hudson's designated wellhead protection area. (See Section 1207.08, (Wellhead Protection Area Standards.)
      (5)   Stream corridor and wetland protection and buffering. (See Section 1207.03, Stream Corridor and Wetlands Protection.)
      (6)   Preservation of existing levels of ecological integrity as shown on any of the individual metrics or the undeveloped IEI composite set forth in Appendix B to this Code.
   (c)   Limits of Disturbance–Development Standards and Guidelines.
      (1)   Construction activity inside the limits of disturbance.
         A.   All construction activity, including, without limitation, grading, excavation, or stockpiling of fill material shall be contained within the approved limits of disturbance.
         B.   No construction activity shall be permitted within the limits of disturbance, whether to provide for a building site, on-site utilities or services, or for any roads or driveways, prior to the approval of any required erosion and sedimentation control plan for the development.
      (2)   Land disturbing activities outside the limits of disturbance. Land disturbance activity may occur outside the limits of disturbance for the following limited purposes:
         A.   Restoration of previously disturbed or degraded areas.
         B.   Utility installations and emergency public safety activities when such activities and installations cannot reasonably be contained within the limits of disturbance or other nearby developed areas.
         C.   Construction of a multi-purpose trail that will provide public access for recreational purposes when such trail cannot reasonably be contained within the limits of disturbance or other nearby developed areas.
         D.   Enhancement of the habitat values and/or other natural resource values of an identified natural area.
         E.   Landscaping, including vegetation clearing, planting of lawns, and tree removal may occur in the areas outside the limits of disturbance, except that trees with a diameter at breast height (DBH) of nine inches or more shall not be removed, except as provided in Section 1207.02.
         F.   Bufferyards. Areas along the perimeter of a lot that are outside the established limits of disturbance may be disturbed to establish a bufferyard as required by Section 1207.04.
      (3)   Standards for protection during construction: designation and fencing. Approved limits of disturbance shall be shown on the final site plan or subdivision plan. Limits of disturbance shall be designated in the field prior to commencement of excavation, grading, or construction with fencing or other methods approved by the City Manager. For the protection of trees and clumps of trees to be preserved, see the tree protection specifications in Section 1207.02 (d).
(Ord. 16-148, § 13.  Passed 2-21-17; Ord. 18-93.  Passed 10-15-19.)