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<br />FLOOD fiGHTING METHODS 2003 <br /> <br />6.3A <br />Page 39 <br /> <br />CONTROL OF BOilS (On Levee Slope) <br /> <br />If the boil is close to or on the levee slope, aU-shaped <br />sack ring may be built around the boil and sealed into the <br />slope (see Figure 88). Construction of this method can be <br />difficult and requires substantial shoring up of the U-shaped <br />sack ring structure. <br /> <br />A spillway must be constructed to direct water away from <br />all boil sites. <br /> <br /> <br />Figure 88 <br />Spillways can be constructed by nailing <br />two 2"x 6" boards together to form a V notch; <br />PVC pipe; two parallel sandbag rows; visquine, etc. <br /> <br />10 <br />