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<br />I <br /> <br />Flood Control Procedures <br /> <br />Do not place sand bags on <br />manhole covers! <br /> <br />Weightol~ag" ~ <br />,,,insuff,ej.mlto ,_J~~....~ <br />:~~r~:::~.~~ ,,- ~~:ft:;:&,: <br />"~---:~::'<::":~~'''~c-o:~ c::~~~. <br /><nt~t- tLf" 'C"i;m:~h':;:~:;;:.:;': <br />cylinder. WalerwlllnSf! <br />andseelc irsown level. <br /> <br />Visual 28 <br /> <br />Flood Control Procedures <br /> <br />Be alert for Sand Boils and <br />animal burrows! <br /> <br />~~,-..,..: <br /> <br /> <br />Visual 29 <br /> <br />Expedient Flood Trail1\iog <br />Instructor Guide <br /> <br />~t <br /> <br /> <br />Manholes, sewers, and utility channels may <br />transverse the emergency levee and allow the <br />flow of water behind the emergency flood <br />works. Sandbags should not be placed on <br />manhole covers in an attempt to stem the water <br />flow. The tremendous water pressure will blast <br />past any such attempts. Instead, the manhole <br />should be ringed with sandbags. If available, a <br />section of road culvert may be placed on-end <br />over the manhole and bags placed around it. <br />The water will rise and the seek its own level in <br />the sandbag ring. <br /> <br />~t <br /> <br />Another problem are sand boils and animal <br />burrows that can serve as water conduits under <br /> <br />the emergency flood works. Sand boils occur <br />when a near surface sand seam acts as a water <br /> <br />conduit and transverses the emergency flood <br />work. A sand boil occurs when the water <br />bubbles up on the dry side of the levee, similar <br />to the action of an artesian well. <br /> <br />e <br /> <br />HI <br />