Section Env-Wt 903.05 - Information Required for Certain Stream Crossing Standard Permit Applications In addition to the information required by Env-Wt 311 and Env-Wt 903.04, for new and replacement stream crossing projects that require a standard permit the applicant shall submit the following as applicable:
(a) For tier 2 and tier 3 crossings, the following additional channel information at the crossing and for the design reference reach including:(1) A longitudinal profile that is 7 to 10 bankfull widths long with grade controls, pools, and gradients shown; and(2) Particle size distribution of the reference reach;(b) For tier 2, tier 3, and tier 4 crossings, streambed details, with figures, that show the following: (1) The distance from the top of the right bank to the top of the left bank;(2) The streambed simulation materials and the extent, depth, and length of the streambed within the proposed crossing;(3) Approximate elevations, spacing, diameters, and locations of structures for steps, bank stabilization, and other channel rocks for roughness; and(4) Details for sediment retention structures, if any, within embedded structures;(c) For tier 2, tier 3, and tier 4 crossings, the following information on the proposed crossing: (1) The openness ratio, namely the ratio of the area of a cross-section of an individual cell or barrel of a crossing structure, excluding any embedded area, to the length of the structure along the channel;(2) A narrative assessment of the streambed details provided pursuant to (b), above, channel information of existing crossing metrics relative to the proposed structure, as discussed in the NH stream crossing guidelines, available as noted in Appendix B;(3) A narrative assessment of the long-term erosion and stability consequences of constructing the proposed stream crossing, and methods and structures to be implemented to minimize any consequences identified;(4) A narrative assessment of the bed forms and streambed characteristics necessary to cause water depths and velocities within the crossing structure at a variety of flows to be comparable to those found in the natural channel upstream and downstream reaches;(5) The percent of increase in the hydraulic capacity of the stream crossing;(6) A narrative analysis of how connectivity considerations were addressed focusing on stream reach, stream type, stream stability, and existing and potential for erosion in siting and modifying or replacing an existing stream crossing;(7) A narrative explanation of the detrimental geomorphic consequences that have occurred as a result of the existing stream crossing, if any; and(8) A narrative explanation of the crossing's contribution to flooding that damages the crossing or other human infrastructure;(d) For tier 3 crossings, structural details of the crossing, including the following: (1) Structural section, gauge or thickness, and material, minimum and maximum cover limits;(2) Structures, drawn to scale, on elevation view showing bed material location relative to structure, and special backfill zones; and(3) Structural excavation quantity and total excavation estimate;(e) For tier 2 and tier 3 crossings, a demonstration that all design and construction considerations outlined in the NH stream crossing guidelines, available as noted in Appendix B, have been addressed; and(f) For tier 4 crossings, the a narrative explanation of the effect of the crossing on the tidal hydrograph, and the corresponding effect on the upstream and downstream tidal reN.H. Admin. Code § Env-Wt 903.05
Derived from Volume XXXIX Number 28, Filed July 11, 2019, Proposed by #12809, Effective 12/15/2019, Expires 12/15/2029.