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<br />EM 1110-2-1913 <br />31 Mar 78 <br /> <br />e <br /> <br />RIV!:RSIDt <br /> <br /> <br />LANOSIDt <br />If'ET SLOP. <br /> <br />. <br /> <br />a. Homogeneous section on impervious foundation seepage <br />emerging on lands ide slope <br /> <br />~ <br /> <br /> <br />LANDSIDE <br /> <br />~ <br /> <br />RIVERSIDE <br /> <br />b. Section with pervious toe <br /> <br />RIVERSlot <br /> <br /> <br />LANOSI DE <br /> <br />e <br /> <br />F"lL.TF:R SIIND <br /> <br />c. Pervious toe combined with partially penetrating toe trench <br /> <br />Figure 5-8. Embankment with through seepage <br /> <br />5-9. Horizontal Drainage Layers. Horizontal drainage layers, as shown <br />in figure 5-9a, essentially serve the same purpose as a pervious toe but <br />are advantageous in that they can extend further under the embankment <br />requiring a relatively small amount of additional material. They can <br />also serve to protect the base of the embankment against high uplift <br />pressures where shallow foundation under seepage is occurring. Sometimes <br />horizontal drainage layers serve also to carry off seepage from shallow <br />foundation drainage trenches located some distance under the embankment <br />as shown previously in figure 5-4. <br /> <br />. <br /> <br />.. <br /> <br />5-10. Inclined Drainage Layers. An inclined drainage layer as shown <br />in figure 5-9b is one of the more positive means of controlling internal <br /> <br />5-12 <br /> <br />e <br /> <br />~^~ <br />