The purpose of this article is to control soil erosion and the resulting sedimentation from occurring in subdivision areas by requiring proper provisions for water disposal and the protection of soil surfaces during and after construction in order to promote the public health, safety, convenience and general welfare of the community.
The subdivider shall bear the final responsibility for the installation and construction of all required drainage, slope stabilization, soil erosion and sediment control measures and structures according to the provisions of these regulations.
The following standards shall be observed by the subdivider in the design, layout and engineering of the proposed subdivision in both the preliminary layout phase and the final plat phase:
A. 
Except where modified herein, the Stormwater Management and Erosion Control Handbook for Urban and Developing Areas In New Hampshire prepared by the New Hampshire Department of Environmental Services, Rockingham County Conservation District, and USDA Soil Conservation Service, latest edition, will be used in design of all control measures.
B. 
Stripping of vegetation, regrading or other development shall be done in such a way that will minimize soil erosion first and capture potential sediment second.
C. 
Whenever practical, natural vegetation shall be retained, protected and supplemented. Upon final grading, vegetation shall be reestablished, except where to be covered with hard surfaces.
D. 
The disturbed area and duration of exposure shall be kept to a minimum. Disturbed areas not worked for two weeks or more shall be stabilized by applying and maintaining mulch. Disturbed areas not being worked for six weeks or more shall be stabilized by applying seeding, mulch, and tackifier, and maintaining vegetation.
E. 
Upon permanent seeding, slopes steeper than 2.5 horizontal to one vertical shall be stabilized with degradable erosion-control matting designed to last 12 months to 24 months. Upon permanent seeding, an organic tackifier shall be applied to mulch on disturbed slopes between 4:1 and 2.5:1.
[Amended 4-11-2017 ATM by Art. 29]
F. 
All disturbed work areas shall be stabilized prior to October 15.
G. 
Sediment in the runoff water shall be trapped until the disturbed area is stabilized by the use of sediment basins or other acceptable methods. Drainage channels and earthen basins shall be stabilized with seed and mulch/erosion control fabric, sod, or riprap or other hard surfacing (where allowed) prior to directing flow to them.
H. 
The inlet to subsurface infiltration devices shall be plugged until the vegetation is established in the areas tributary to the devices.
I. 
The subdivider shall provide a construction sequence on the plans, including the earthwork and flow-diversion sequence as well as the timing for the installation of the erosion control measures.
[Amended 4-11-2017 ATM by Art. 29]