Landslide Mitigation - Semi-quantitative Approaches for Landslide Assessment and Prediction - page 236

Fig. 8.10 Breast wall at
Paglajhora
Fig. 8.11 Breast wall at
Tindharia
decomposition of refuse (Bromhead et al. 1996 ) respectively. The diversion of
water from the potential slope failure zone is mainly done through Catch Water
Drain. The diversion is made from more damage prone areas to that of less. The
natural drainage after being interfered with, they attempt to redesign themselves
which may be detrimental to the slope. Sometimes natural processes of weathering
due to lithological characters may develop brittle and fragile slope forming mate-
rials which through interaction with surface and sub surface water may become
susceptible to down slope movement. Thus the slope has to be completely excluded
from both surface and sub surface water and for this purpose, Catch Water Drain is
the best option. The gully (Channels or streams) heads are prone to landslide where
the runoff enters into the channel head helping it to progress further uphill. The
slide scars extend uphill and the scarps along the sides also extend upslope
increasing the area of the slide scar and bringing more and more area under the