Landslide Mitigation - Semi-quantitative Approaches for Landslide Assessment and Prediction - page 240

Fig. 8.14 Massive landslip at Paglajhora

promote faster growth of vegetation and soil on the surface of slope is rst graded to

remove the unevenness present, where possible. The area may be seeded with very
limited quantity of Pennisetum species/Vetiveria species grasses known for quick
and easy growth and have root depth nearly equaling the existing soil cover, i.e.
around 40 50 cm. The netting of slopes generally will stop the downward move-

ment of slope materials as it reduces the impact of direct rain drops and acts as a
barrier to surface flow and even holds together slope material. Such method could
be very much applicable in Shivkhola Watershed mainly at the places of Lower
Paglajhora (Fig. 8.14 ), marginal North East part of Shiviter Tea Garden, and Tin-
dharaia where structural measures are not possible enough due to very steep slope
gradient and very fragile rock-soil composition. Proper care for recurring growth of
the vegetations on the speci

-

ed and managed surface has to be taken for year long
protection of the slope from landslip.

8.3.9 Introduction of Vegetation and Slope Stability

The role of vegetation in improving slope stability is well recognized and com-
prehensive reviews may be found in several publications of Greenway ( 1987 ),
Phillips and Watson ( 1994 ), Gray and Sotir ( 1996 ). In general, vegetation influence
slope stability through both hydrological and mechanical mechanisms (Table 8.2 ).
Hydrological mechanism that lead to lower pore water pressure and soil moisture