47.5 MB - The Whole Building Design Guide

Emergency power generators: Generators that are installed at-gradeare susceptible to inundation and will be out of service after aflood (see Figure 2-20).Tanks (underground): Underground storage tanks are subjected tosignificant buoyant forces and can be displaced, especially whenlong-duration flooding occurs. Computations of stability shouldbe based on the assumption that the tank is empty in order tomaximize safety. Tank inlets, fill openings, and vents should beabove the DFE, or designed to prevent the inflow of floodwatersor outflow of tank contents during flood conditions.Tanks (aboveground): Aboveground storage tanks are subject tobuoyant forces and displacement caused by moving water. Standardstrapping of propane tanks may be inadequate for theanticipated loads. Tank inlets, fill openings, and vents should beabove the DFE, or designed to prevent the inflow of floodwatersor outflow of tank contents during flood conditions.Public Utility Service: Damage to public utility service (potablewater supply and wastewater collection) can affect operations andmay cause damage to critical facilities:Figure 2-20:Although it was anchoredand not displaced byfloodwaters, this generatorwas out of service afterbeing submerged.MAKING CRITICAL FACILITIES SAFE FROM Flooding2-51