Impact Assessment of Hydrologic Attributes and Slope Instability - Semi-quantitative Approaches for Landslide Assessment and Prediction - page 104

Fig. 3.2 Spatial distribution of drainage up to 4th order stream, 1972

watershed 1 ranks 2nd in terms of areal coverage. On an average most of area of
sub-watershed 2, 3, 4, 5 and 6 are dominated by first order streams, followed by 2nd

and 3rd orders (Table 3.4 ). Order wise stream network analysis of 1972 depicts that
the whole basin is being mostly dominated by the impact of 1st order streams and
their gradual headward extension (Fig. 3.2 ). The central-mid section is character-
ized by the cumulative effects of streams due to existence of 3rd and 4th order
streams with maximum discharge.

3.3.2 Drainage Network Analysis of 1987

The drainage lines depicted in 1987 SOI (Survey of India) Topographical map,
showed a further branching and extension of the channels (Fig. 3.3 ). The watershed