Section Env-Wt 606.07 - Residential Tidal Docks: Design Standards(a) A residential tidal dock shall have one of the following configurations: (1) A pile-supported fixed pier perpendicular to the shore, that connects to a ramp, that connects to a float;(2) A ramp that connects the shore to a float; or(3) A pile-supported fixed pier parallel to shore.(b) An applicant may propose a fabricated wooden or metal stairway at the landward end of the dock for access to and from a residential tidal dock, which the department shall approve as part of the dock permitting process provided:(1) The width of the stairway does not exceed 6 feet;(2) Construction over the bank does not require regrading or recontouring; and(3) The bottom of the stairs lands above mean high tide.(c) The maximum overall structure length including pier, ramp, and float, measured seaward from the HOTL, shall not exceed the greater of 200 feet or the length needed to reach water of sufficient depth to allow the terminal section of the dock to be floating at mean low water.(d) The maximum overall footprint of the entire structure of:(1) A residential tidal dock serving a single residence shall not exceed 1,500 SF seaward of the HOTL; and(2) A residential tidal dock proposed to serve a group of residences may be larger provided the requirements for compensatory mitigation in Env-Wt 605.03 and Env-Wt 313.04 are met.(e) For permanent piers: (1) The maximum width shall not exceed 6 feet;(2) The maximum length shall not exceed 200 feet; and(3) The height-to-width ratio above the substrate shall be 1:1 or greater.(f) Floats may be of any configuration so long as the total square footage does not exceed 400 SF, provided that an additional 200 SF shall be allowed for a float serving a group of residences. Applicants for a residential tidal dock serving more than 4 residences may request a waiver of the 600-SF limit in accordance with Env-Wt 200.(g) All floats shall be designed and installed so as to prevent substantial changes in their positions from tides and storm events that are less than hurricane force.(h) To prevent mechanical damage or hydraulic damage, or both, to the substrate from the float(s) during low tides in cases where mean lower low water is seaward of the terminal float(s) at low tide, or if it is impracticable or impossible to place floating docks in water deep enough to avoid contact with the bottom, the design shall include float stops or other means of suspending the float with 2 feet or more of clearance between the bottom of the float and substrate, with greater clearances required in higher energy environments that experience strong wave action.(i) Float stops shall be marked with buoys to avoid being hazards to navigation when ramps and floats are removed for the season.(j) Float anchor chains shall be secured to the substrate by helical screw anchors where practicable. If helical screw anchors cannot be installed due to rocky bottom conditions, the applicant shall propose an alternate means of anchoring the floating portion of the dock and show such means on the plans. If block anchors are proposed, the anchors shall be identified in the application as fill. (k) The spacing between decking components shall be not less than 3/4-inch.(l) Minimum spacing between pile bents shall be 12 feet center to center.(m) The substrate shall not be shaded by any other structural components not addressed herein.(n) Aquaculture structures associated with residential tidal docks shall be installed within existing legal boat slips.(o) Aquaculture structures associated with residential tidal docks that extend outside the footprint of the originally permitted docking structure and associated boat slip(s) constitute a modification of the approved docking structure and shall meet the requirements of Env-Wt 603.02.N.H. Code Admin. R. Env-Wt 606.07
#2923, eff 12-10-84; amd by #4506, eff 10-13-88; ss by #5028, eff 12-20-90; rpld and moved by #5740, eff 11-23-93 (see Env-Wt 404.05 )
New.#8341, eff 4-25-05 (from Env-Wt 606.12 ) (See second Revision Note at chapter heading of Env-Wt 600)
Amended by Volume XXXIX Number 28, Filed July 11, 2019, Proposed by #12806, Effective 12/15/2019, Expires 12/15/2029 (See Revision Notes #1, #2, #3, and #4 at chapter heading for Env-Wt 600).Amended by Number 45, Filed November 9, 2023, Proposed by #13775, Effective 10/13/2023, Expires 10/13/2033.