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ARTICLE X - STEEP SLOPES DISTRICT (SS)
(Adopted March 14, 1989; Amended March 13, 2007)
The Steep Slopes District is intended to reduce damage to streams and lakes from erosion, storm water run-off caused by improper or excessive construction, or effluent from improperly sited sewage disposal systems; to preserve vegetative cover and wildlife habitat; to preserve scenic views and protect unique and unusual natural areas.
B. The Steep Slopes District shall be considered as overlaying the Rural District and those areas, in all other districts, that are not served by public sewer and water. Any use permitted, or lot size established, in those districts so overlaid, shall only be permitted subject to the provisions of this Article.
C. Overlay Map:
The Steep Slopes District includes all areas on the overlay map, titled Town of Antrim Slopes Map and dated September 1, 1988, that show slopes in excess of fifteen (15) percent . The map is incorporated into this Ordinance by reference.
D. Permitted Uses:
Permitted uses and uses allowed by special exception in the underlying district are allowed so long as the lot size meets the standards in Section E below.
E. Minimum Lot Size: (Adopted March 10, 1992)
In areas not served by public water and sewer and where there are wetlands and/or steep slopes, the area of contiguous, non-group 5, poorly drained soils, or non-group 6 soils, floodplain or very poorly drained soils, shall meet the following requirements:
1. Single-family homes with four bedrooms or less shall have 68,000 square feet with a slope less than 8%, 76,000 square feet with a slope 8 - 15%, or 86,000 square feet with a slope more than 15% and less than 25%.
2. Single family homes with more than four bedrooms shall have 15% more area for each additional bedroom over and above that required for four-bedroom, single-family homes.
3. Duplex dwellings with a total of not more than five bedrooms shall have 95,000 square feet with a slope less than 8%, 100,000 square feet with a slope 8 - 15% or 120,000 square feet with a slope more than 15% and less than 25%.
4. Duplex dwellings with more than five (5) bedrooms shall have 15% more area for each additional bedroom over and above that required for a five-bedroom, duplex dwelling. (Adopted March 13, 2007)
Note: A variance may be granted based on the results of a High Intensity Soil Survey and the Model Subdivision Regulations for Soil Based Lot Size, Rockingham County Conservation District, June 1991.
F. In the event an area is incorrectly designated as being a steep slope of between 15 and 25% or of being over 25% on the Town of Antrim Summary of Natural Features Map or that an area not so designated meets the criteria for a steep slope designation, and evidence to that effect is satisfactorily presented to the Planning Board during a site plan review or during an application for subdivision approval, or to the Board of Selectmen during an application for a building permit, such Board may determine that the restrictions contained in this article shall or shall not apply, whichever the case may be. Any necessary testing or expenses incurred to clearly delineate questionable steep slopes areas shall be at the expense of the landowner or developer.