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<br /> <br />46 <br /> <br /> <br />-~ . i{ <br />"'I; <br />il , <br /> , , <br /> I' ~ <br /> Ii I!' <br /> <br /> <br /> <br />I <br /> <br />~ <br /> <br />Figure 36. -Sliding flood shield in open position. This shield is for a service entrance <br />and is strictly functional <br /> <br />Flood shields can be secured in a number of ways. Some shields are bolted onto <br />their frames only on the tops and bottoms (Figure 41), while others are bolted against <br />the receiving frame on the sides (Figure 42). Whatever the method used, care must be <br />taken to assure that the gates have a watertight seal against the frame. This can be <br />achieved by applying uniform pressure on the gasket or seal through a proper design of <br />bolting patterns and by using caulking compounds, binding agents, oakum, or lead wool, <br />to control leakage. <br />Flood shields for doorways need not cover the entire doorway, they may only ex- <br />tend to the elevation of the selected flood protection level. Because of structurallimi. <br />tations, the building shown in Figure 43 is equipped with flood shields to protect against <br />only a three-foot flood stage. If that stage is exceeded, this flood proofing measure will <br />be overtopped thereby avoiding the build-up of pressures which could cause structural <br />damage. <br />Flood proofing must be complete up to the selected level of protection. U an en- <br />tranceway cannot be protected by a watertight flood shield because of its design, it will <br />need to be closed off by emergency measures such as sandbags over vinyl sheeting <br />backed with timbers. <br />