S. No. Parameters Symbol Formula Reference
1 Linear aspects
1.1 Stream Order Sμ Hierarchical rank [19]
1.2 Bifurcation Ratio Rb Rb = Nμ / Nμ +1
Where, Rb = Bifurcation ratio,
Nμ = No. of stream segments of a given order and
Nμ +1= No. of stream segments of next higher order.		 [21]
1.3 Mean Bifurcation Ratio Rbm Rbm = Average of bifurcation ratios of all orders [19]
1.4 Stream Length Lμ Length of the stream (kilometers) [5]
1.5 Mean Stream Length Lsm Lsm = Lμ/Nμ
Where, Lμ = Total stream length of order ‘μ’
Nμ = Total no. of stream segments of order ‘μ’ 		[19]
1.6 Stream Length Ratio RL RL= Lsm/Lsm-1
Where, Lsm=Mean stream length of a given order and
Lsm-1= Mean stream length of next lower order 		[5]
1.7 Length of Overland Flow Lg Lg=1/2D Km
Where, D=Drainage density (Km/Km2) 		[5]
1.8 Basin Perimeter P P=Outer boundary of drainage basin measured in kilometers. [21]
1.9 Basin Length Lb Lb=1.312×A0.568 [21]
2 Areal aspects
2.1 Basin Area A Area from which water drains to a common stream and boundary determined by opposite ridges. [19]
2.2 Drainage Density Dd Dd= Lμ/A
Where, Dd = Drainage density (Km/Km2)
Lμ = Total stream length of all orders and
A = Area of the basin (Km2). 		[24]
2.3 Drainage Frequency Fs Fs = Nμ/A
Where, Fs = Drainage frequency.
Nμ = Total no. of streams of all orders and
A = Area of the basin (Km2).		 [24]
2.4 Infiltration Number If If = Dd × Fs
Where, Dd = Drainage density (Km/Km2) and
Fs = Drainage frequency. 		[43]
2.5 Drainage Texture Dt Dt = Nμ /P
Where, Nμ = No. of streams in a given order and P = Perimeter (Kms) 		[5, 44]
2.6 Form Factor Ratio Rf Rf = A/Lb2
Where, A = Area of the basin and
Lb = (Maximum) basin length 		[24]
2.7 Elongation Ratio Re Re= √A /π / Lb
Where, A= Area of the basin (Km2)
Lb=(Maximum) Basin length (Km)		 [21]
2.8 Circularity Ratio Rc Rc = 4πA/ P2
Where, A = Basin area (Km2) and
P= Perimeter of the basin (Km)		 [40]
3.0 Relief Aspects
3.1 Basin Relief H H = Z – z
Where, Z = Maximum elevation of the basin (m) and
z = Minimum elevation of the basin (m) 		[45]
3.2 Relief Ratio Rr Rr = H/Lb
Where, H = basin relief (m) and
Lb = Basin length (m) 		[21]
3.3 Dissection Index DI DI = H / Ra
Where, H = basin relief (m) and
Ra = Absolute relief (m)		 [46]
3.4 Channel Gradient  Cg Cg = H / {(π/2) × Clp}
Where, H = basin relief (m) and
Clp= Longest Dimension Parallel to the
Principal Drainage Line (Kms) =Lb		 [47]
3.5 Basin Slope Sb Sw = H / Lb
Where H and Lb= given above 		[42]
Table 1: Morphometric parameters with formulae.