Section Env-Wr 503.01 - Inundation Map Requirements(a) The owner shall produce an inundation map to provide the local emergency responders with a tool for planning evacuation procedures.(b) The inundation map shall delineate the area impacted by a potential dam failure, as determined by the breach analysis required by Env-Wr 502.(c) The inundation map shall meet the following criteria: (1) The map shall be at a scale of 1:2,000 or of greater detail;(2) Residences, commercial, and industrial structures or clusters of structures, when located in close proximity to each other, within the inundation area shall be shown on the most recent USGS topographic mapping, supplemented by locations derived from aerial photography available on the DES website, www.des.nh.gov;(3) Roads within the inundation area and within at least 0.5 mile from the exterior boundary of the inundation area shall be shown;(4) The time for the flood wave to reach critical areas, including those outlined in (2) and (3), above, including time to rise and time to peak shall be shown;(5) Peak flood wave velocities at critical areas shall be shown;(6) Peak flood wave depths shall be shown;(7) Political boundaries shall be shown;(8) The map shall indicate whether the inundation area represents a sunny day failure or a storm day failure scenario; and(9) The date on which the map was prepared shall be included on the map.(d) If the inundation map consists of 3 or more pages, the owner shall provide an index map which clearly directs the user to the appropriate map for a given area.N.H. Code Admin. R. Env-Wr 503.01
#1716, eff 2-20-81; ss by #2207, eff 12-13-82; ss by #2900, eff 11-7-84; rpld by #4534, eff 11-30-88
New. #6462-B, eff 2-21-97 (from Env-Wr 504.01 ); ss by #8285, INTERIM, eff 2-21-05, EXPIRES: 8-20-05; ss by #8414, eff 8-20-04; ss by #10510, eff 1-22-14