16.7 Conclusion
Remote sensing and GIS techniques constitute as
an efficient tool in delineation and analysis of
drainage basin. The morphometric analysis has
been carried out with measurement of linear,
areal and relief aspects of basins. All the morphometric parameters of Spiti river basin provides an important information about drainage
density, stream frequency, soil texture, slope
aspect, drainage pattern, type of relief, stream
order and total number of streams. Morphometric
analysis of the study area of all three sub-basins
represents sub-dendritic to dendritic drainage
pattern with moderate to very fine drainage texture. The variation in stream length ratio may be
due to change in slope and topography. The
bifurcation ratio of all three basins indicates
normal basin category and presence of low
drainage density suggests that the region has
highly permeable sub-soil. Stream frequency
indicates that all basins show the positive relation
with increasing stream number concerning
increasing drainage density. The values of form
factor and circulatory ratio suggest that the Spiti
river basin is sub-circular in shape, whereas
Tsarap Chu and Parechu basins indicate that it is
elongated in shape. Elongation ratio indicates
that all the three basins are region of very high
relief and steep slope.
Analysis of drainage basin parameters of Spiti
river will further help in assessing flood vulnerability to downstream dwellers. It can be used in
prioritization of suitable sites for water harvesting in the region because people are facing
problem of water scarcity despites of its location
in glaciated region.
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