Parameter

Formula

Reference

Bifurcation Ratio (Rb)

Rb = Nu/Nu + 1 where,

Nu = Total number of stream segment of order “u”;

Nu + 1 = Number of segments of next higher order

[6] [9]

Drainage Density (Dd)

Dd = Lu/A where, Lu = Total length of streams;

A = Area of watershed

[9]

Stream Frequency (Fs)

Fs = N/A where, N = Total number of streams;

A = Area of watershed

[10]

Drainage Texture (Dt)

T = Nu/P where, Nu= Total no of streams of order “u”;

P = Perimeter of watershed

[9]

Form Factor (Rf)

Rf = A/Lb² where, A = Area of watershed,

Lb = Basin length

[9]

Circulatory Ratio (Rc)

Rc = 4πA/P² where, A = Area of watershed,

π = 3.14, P = Perimeter of watershed

[11]

Elongation Ratio (Re)

Re = 2√(A/π)*Lb where, A = Area of watershed,

π = 3.14, Lb = Basin length

[12]

Length of Over Land Flow (Lof)

Lof = 1/2Dd where,

Dd = Drainage density

[9]

Shape Factor (Bs)

Bs = Lb²/A where, Lb = Basin length,

A = Area of basin

[11]

Relief Ratio (Rh)

Rh = Bh/Lb where, Bh = Basin relief,

Lb = Basin length

[14]

Ruggedness Number (Rn)

Rn = Bh*Dd where, Bh = basin Relief,

Dd = Drainage Density

[6]

Compactness Coefficient (Cc)

Cc = 0.2821 P/A 0.5 where,

P = Perimeter of watershed, A = Area of watershed

[13]

Basin Relief (Bh)

Bh = H-h where H = Highest elevation,

h = lowest elevation of the basin

[6]