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<br />Figure 2. Barriers <br /> <br />Levee is compacted <br />fil/with2:10r <br />3:1 slope <br />(forstahility) <br /> <br />EEl <br />= <br /> <br />EEEa <br />== <br /> <br />~ Earn <br /> <br />FloodwaJ/ is reinforced <br />and anchored 10 withstand <br />hydrostatic food <br /> <br /> <br />Sump and pump handle underseepage <br />and internal draina!{e <br /> <br />Account for sewer and drQin backup <br /> <br />Curoffvuh'e <br /> <br />Where there is not enough room for a berm or levee, concrete. masonry or steel structures are <br />used. Concrete and masonry walls should be built with internal reinforcing bars for strength, <br />and to resist cracking and settling over time. They must be properly anchored to withstand <br />lateral hydrostatic pressure; care must be taken to ensure they are watertight. Figure 3 depicts <br />an example of a design for a concrete floodwall. <br /> <br />Figure 3. Floodwall Design <br /> <br />T/W EL. VARIES <br /> <br />FUTURE FLooO WATER \ <br />ELEVATION <br /> <br />rH"'" <br /> <br />EXISTING BLOG <br /> <br />This is part of the specifications <br />for a floodwall around a public <br />housing site in Rosemont, Illinois, <br />The project was funded by the <br />Village's general revenues after a <br />1986 flood caused $1,3 million in <br />damage, <br /> <br />GROUND n. VARIES <br /> <br />.4'Q)16" <br /> <br />;% <br /> <br />INT. flOOR <br />El.VARlES <br /> <br />The reinforcing bars and footing <br />are needed to ensure that the <br />wall will resist the hydrostatic <br />pressures of floodwaters, <br /> <br />~ <br /> <br />. <br />~ 3MCLEAR <br /> <br /> <br />fiELD DIMENSION <br /> <br />The wall has openings at side- <br />walks to allow the elderly <br />residents easy access, Human <br />intervention is required to sand- <br />bag the openings, Maintenance <br />crews are on site around the <br />clock and sandbags are stacked <br />on pallets for quick installation, <br /> <br />J <br /> <br />Providing access into the area protected by a wall or levee can be complicated. If the slope <br />is not too steep, pedestrians and vehicles can go over the wall, as in the case of the levee <br />illustrated in Figure 10 on page 24. Some barriers have openings for driveways and <br />sidewalks. Closing these openings is dependent on human intervention, so their use is not <br />appropriate where there is little warning time. If the wall is high, a stairway can be built over <br />it to provide access without human intervention. An example of this approach is illustrated in <br />Figure lIon page 25. <br /> <br />-4- <br />