Section Env-Wt 513.15 - Design Requirements for Permanent Docking Structures(a) In addition to meeting the applicable design requirements of Env-Wt 300, all permanent docking structures and all accessory docking structures shall be designed to meet the requirements in this part relative to setbacks, navigation space, dimensions, and frontage, and the requirements of this section.(b) The standard design for a permanent docking structure shall be open pile construction.(c) Pile bents shall be spaced at least 12 feet apart, as measured from the center of each pile bent.(d) The department shall approve a design other than open pile construction only if the applicant demonstrates that: (1) Pilings cannot be driven due to site conditions; and(2) The alternate design proposed is the least impacting design for that location.(e) The demonstration that pilings cannot be driven shall:(1) Be submitted with the application; and(2) Include documentation of trial driving by commercial equipment, probings, or experience in construction of immediately adjacent docks, or any combination thereof.(f) If an applicant demonstrates that pilings cannot be driven, an alternate design may be submitted.(g) If the alternate design is a crib dock, the crib shall be designed in accordance with the following:(1) The maximum size of the crib in water up to 6 feet deep shall not exceed 6 feet long by 6 feet wide, and of such height as is necessary to support the deck above the water level;(2) The side dimensions of the crib shall be increased by not more than one foot for every additional foot of water depth above 6 feet;(3) The minimum clear spacing between cribs shall be not less than 12 feet; and(4) The crib itself shall be of timber, prefabricated concrete, or other approved materials securely fastened together and of such size and spacing necessary to completely contain the stone ballast or other fill material.(h) If the alternate design is other than a crib dock, such as caissons, concrete supports, or prefabricated cofferdams, the docking structure shall be designed in accordance with standard engineering practices for the design proposed.N.H. Code Admin. R. Env-Wt 513.15
Derived from Volume XXXIX Number 28, Filed July 11, 2019, Proposed by #12805, Effective 12/15/2019, Expires 12/15/2029 (See Revision Notes #1 and #2 at chapter heading for Env-Wt 500).Amended by Volume XL Number 41, Filed October 8, 2020, Proposed by #13124 Effective 10/23/2020, Expires 10/23/2030.Amended by Number 45, Filed November 9, 2023, Proposed by #13776, Effective 10/13/2023, Expires 10/13/2033.