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<br /> <br /> <br />lead to the failure of the levee. Burrows may be easily plugged if <br />they are located above the water line. Flooded burrows are more <br />difficult. Weighted sheets of plastic and other materials may be <br />dropped on the water side of the levee to seal the opening of the <br />burrow and reduce the water flow. Manure mixed with straw or <br />dry hay can also be used t9 seal and plug animal burrows. The <br />mixture is thrown into the water near the vortex of the flow at the <br />entrance of the burrow. As the material is sucked into the water <br />flow, it will eventually seal the leak. <br /> <br />Notes <br /> <br />) <br /> <br />The banks of a water saturated levee may slide or slump. A <br />bank slide may result in the failure of tlte levee. However if <br />detected early, it may be possible to stabilize the area and shore up <br />the structure. Slides, slumps, and cave-ins should be reported <br />immediately. <br /> <br />Sewers, manholes, field tiles, and utility conduits can provide <br />easy paths for water to bypass flood works. Monitoring teams <br />should be alert to water flowing up from these and similar <br />openings and report all such cases immediately. Extreme caution <br />should be used when investigating manholes as the water flow may <br />have already displaced the lid leaving an open water filled shaft. <br />Falling into one of these shafts can be deadly as the current <br />conditions may make rescue impossible. <br /> <br />Wave action can overtop the structures and erode significant <br />quantities of soil and fill. As this material is flushed away, the <br />mass of the structure is reduced and the hydrostatic pressure can <br />cause the failure of the flood control device. Wave action can take <br />a severe toll on flood control devices in surprisingly little time. <br /> <br />----"ExercIse extreme caution when mOllltoflng <lams an<l---- <br />spillways. Water flowing over dams and through spillways can <br />cause side scour erosion and lead to the rapid failure of the <br />structure. Water movement through dams, is an ominous sign <br />particularly if soil and sand can be detected in the flow. This <br />should be reported to higher authorities at once. <br /> <br />Logs, pieces of buildings, and other floating debris can easily <br />damage flood works. Structures on river bends and near bridges <br />are particularly susceptible to debris damage. Use extreme caution <br />when investigating debris as the water pressure may cause the <br />material to lurch or shift suddenly and without warning. <br /> <br />Sometimes levees and flood control works have been <br />sabotaged during floods. Monitoring teams should be alert for <br />unauthorized personnel along flood control structures. Suspicious <br /> <br />Page7-5 <br />