Section Env-Wr 303.11 - Discharge Capacity(a) All low hazard, significant hazard, or high hazard dams constructed prior to February 19, 1981 shall pass the flows indicated below with one foot of freeboard and without manual operations: (1) Low hazard dams shall pass a 50-year flood, or at the owner's option, the site specific inflow design flood;(2) Significant hazard dams shall pass the 100-year flood, or at the owner's option, the site specific inflow design flood; and(3) High hazard dam shall pass 250% of the 100-year flood, or at the owner's option, the site specific inflow design flood.(b) Dams constructed after February 19, 1981 shall pass the flow required by the administrative rules in place at the time of the dam's construction, in accordance with the classification of the dam at the time of construction.N.H. Admin. Code § Env-Wr 303.11
#8414, eff 8-20-05; ss by #10510, eff 1-22-14