Lama et al.
R f = A/(L b ) 2
Where, R f = Form factor
Form Factor (R f )
A = Area of the basin
L b = Basin length
Rc = 4* π *A/(P) 2
Where, R c = Circularity ratio
Circularity Ratio (R c )
π = 3.14
A = Area of the basin
P = Perimeter of the basin
R e = (2* ( A / 3 . 14 ) )/L b
Where, R = Elongation ratio
e
Elongation Ratio (R e )
A = Area of the basin
L b = Basin length
I f = D*F s
Where, I f = Infiltration number
Infiltration Number (I f )
D = Drainage density
F s = Stream frequency
Nd = H*D
Where, N d = Ruggedness number
Ruggedness Number (N d )
H = Total relief of the basin in km
D = Drainage density
Results and Discussion
a fifth order watershed having dendritic drainage
In the present study, morphometric analysis of the
pattern. The order of streams is closely governed by
watershed was carried out in terms of the parameters,
the slope conditions. The higher order streams are
namely, stream order, stream length, bifurcation
associated with flat topography, while, streams of
ratio, relief ratio, drainage density, stream frequency,
lowest orders are found in steeper slopes. According
drainage texture, form factor, circulatory ratio,
to Singh (2006), lower the stream order, higher is the
elongation ratio, infiltration number and ruggedness
number of streams. In the present study, a similar
number. The results of the analysis have been
relationship between the stream order and number
presented has been presented in Table 2.
of streams was observed (Table 2). A logarithmic plot
of the number of streams of a given order against
The ranking of streams into different orders is the
the order (Figure 2a) showed a linear relationship
first step in drainage basin analysis and was carried
with small deviation of the plotted points from the
out based on the hierarchical method proposed by
straight line which is in accordance to the law of
Strahler (1964). A perusal of Table 2 indicates that
stream numbers proposed by Horton (1945). Similar
there are 643 stream segments of different orders
relationship has also been observed by Subba Rao
and the Um Shipra watershed can be designated as
(2009) and Thakuriah et al. , (2012).
32