Landslide Mitigation - Semi-quantitative Approaches for Landslide Assessment and Prediction - page 229

8.3 Recommended Landslide Mitigation Practices

After discussing the problems perceived by the people living in the landslide
affected areas in the Shivkhola watershed, the applicability of various landslide
mitigation measures that could be incorporated in this connection to reduce the
degree and frequency of landslide phenomena for the concerned study area were
analyzed in detail. It is true that the suggestions for landslide mitigation measures
can only minimize/reduce the rate of harmful effect of slope failure to the com-
munities but cannot check the landslide activities in the area absolutely. The
following recommendations must be introduced immediately in the suitable places
of very high landslide susceptible and risk prone areas in the Shivkhola, such as
Paglajhola, Tindharia, Shiviter Gayabari, Nurbong, Giddapahar and Mahanadi.
Others area should also be brought under the scheme of landslide mitigation
measures for reducing or checking the future landslide phenomena.

8.3.1 Armouring the Catch-Water Drain Along the Junction
Between Road and the Hill Slope

The landslides along the Hill Cart Road especially at Tindharia, Paglajhora, and
Mahanadi and Giddapahar section are due to the concentration of the upland
drainage, along the drain at the base of back slope along the Hill Cart Road and the
Narrow Gauge Rail. A huge run-off from a large upslope area pass through the drain
along the junction between road and the hill slope (Fig. 8.1 ). This junction should
be completely cemented so that no signi cant water can pass through it causing

harm to the road. Maximum of the damage from outer margin of the road is made

Hill Slope

Runoff Contribution

Catch Water Drain

Road Possible Slide

Down Ward Pressure

Percolation Damage Starts at

Emergence Point

Through Flow

Fig. 8.1 Schematic diagram showing the damage by Percolation along the drain at the junction of
Hill side and Road