PART C - CONDITIONS CAUSING SUBSURFACE EROSION
Many construction projects fail because of unforeseen subsurface erosion. The subsurface conditions contributing
to this problem are-
Side hill seepage.
Study Figure 6-3. All of the conditions promoting subsurface erosion are illustrated.
Figure 6-3. Schematic cross section showing the occurrence of groundwater
PART D - METHODS OF CONTROLLING SUBSURFACE EROSION
Subsurface water can be controlled using a combination of techniques which will vary according to the conditions
existing in the area to be drained. Selected techniques which should be considered when planning and designing