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<br /> <br />. <br /> <br />EM 1110-2-1913 <br />31 Mar 78 <br /> <br />Table 1-2. Classification of Levees According to Use <br /> <br />Type Definition <br /> <br />~... <br /> <br />Mainline and tributary levees Levees that lie along a m instream and <br />its tributaries, respec ively. <br /> <br />Ring levees Levees that completely en ircle or "ring" <br />an area subject to inun ation from all <br />directions. <br /> <br />Setback levees Levees that are built lan ~ard of exist- <br />ing levees, usual~ bec use the exist- <br />ing levees have suffere distress or <br />are in some way being e dangered, as by <br />river migration. <br /> <br />Sublevees <br /> <br />Levees built for the purp se of under- <br />seepage control. Suble ees encircle <br />areas behind the main 1 vee which are <br />subject, during high-wa er stages, to <br />high uplift pressures a d possib~ the <br />development of sand boi They nor- <br />mal~ tie into the main levee, thus <br />providing a basin that an be flooded <br />during high-water stage , thereby <br />counterbalancing excess head beneath <br />the top stratum within he basin. Sub- <br />levees are rarely emplo ed as the use <br />of relief wells or seep ge berms make <br />them unnecessary except in emergencies. <br /> <br />. <br /> <br />Spur levees <br /> <br />Levees that project from <br />and serve to protect th <br />from the erosive action <br />currents. Spur levees <br />levees but training dik <br /> <br /> <br />e main levee <br />main levee <br />of stream <br />e not true <br /> <br />1-4 <br /> <br />. <br />