Impact Assessment of Hydrologic Attributes and Slope Instability - Semi-quantitative Approaches for Landslide Assessment and Prediction - page 105

Fig. 3.3 Drainage network of 1987

areas of overland flow were reduced as the drainage was served by channelized flow
and characterized by active down cutting processes over the steep slope along both
sides of the main Shivkhola River. The analysis of drainage for a period during
1972

1987 revealed the extreme dynamism in the extension of the channels. The
formation of numerous small channels have increased the erosion of surface and
sub-surface soil as well as entraining the small soil particles and reducing the
cohesive strength of the soil which could induce slope failure in near future. Because
of the increased down cutting of the channels the slope surface were getting dis-
sected and rugged gradually making some part of the region inaccessible. The
interfluves are further sharpened indicating the stage of early maturity. This stage
was characterized by maximum extension of slope without remarkable presence of
flat surface. In such condition slope instability gets maximum attention from plan-
ners, administrators and academicians due to their frequent manifestation in slope
failure.

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