Abstract :
The linking of the geomorphological
parameters with the hydrological characteristics of the
basin provides a simple way to understand the hydrologic
behaviour of the different basins particularly of the
ungauged basins because the hydrologic and geomorphic
effects of natural and human process with in a catchment
are focused at its outlet. The development of morphometric
techniques was a major advance in the quantitative
description of the geometry of the drainage basins and its
network which helps in characterizing the drainage
network. The geomorphological properties which are
important from the hydrological studies point of view
include the linear, aerial and relief aspect of the watersheds.
In the present study morphological study has been carried
in the catchments of Himayatsagar and Osmansagar
reservoirs. The catchments of Himayatsagar and
osmansagar reservoirs cover the area of 1315.14 and 748
km within the elevation rang of 575 to 715 and 585 to 705
m resepectively.the drainage pateern varies from dentric to
subdentric. They are 5th and 4th order drainage basins
respectively. The stream length and stream areas to stream
number relation follows the Hortons laws. Stream density
shows low value for all stream orders. The bifurcation ratio
is high for Osmansagar reservoir catchment. This is due to
the variation in stream frequencies in successive orders.
Lower value of drainage density and stream frequency
indicates the region of highly permeable subsoil strata and
the catchment will not generate runoff soon. The length of
overland flow and time of concentration for the catchments
of Himaytsagar and osmansagar is estimated to be .68, .70
and 16.74, 15.81hours resepectively. From the values of
Circularity ratio, elongation ratio, form factor, and
compactness coefficient of the catchments of Himayatsagar
and Osmansagar reservoirs it is expected that the
catchment is highly irregular, strong relief, steep ground
slope and elongated hydrograph. The high ruggedness
number of the catchment of Himayatsagar and Osmansagar
reservoir shows the high roughness or unevenness.
Keyword :
Drainage network, Morphometric Analysis