Morphometric Parameters

Formula

References

Basic Parameters

Area of Basin (A) Perimeter of Basin (P)

Plan area of the watershed (km2)

GIS

Software analysis

[36]

Perimeter of watershed (km)

[36]

Stream Order (u)

Hierarchical rank

[36]

Basin Length (Lb)

Length of basin (km)/GIS software analysis

[34] [35] [41]

Lb = 1.321 × A0.568a

[17]

Stream Length (Lu)

Length of the stream (km)

[36]

Linear Parameters

Bifurcation Ratio (Rb)

Rb = Nu/Nu + 1, where

[37]

Nu + 1 = no. of segments of the next higher order

Drainage Density (Dd) (km/km2)

Dd = Lu/A, Where

[36]

Lu + total stream length of all orders (km)

A = area of the watershed (km2)

Stream Frequency(Fu) (no./km2)

Fu = Nu/A, where

[36]

Nu = total no. of steams of all orders

A = area of the basin(km2)

Texture Ratio (T) (no./km2)

T = Nu/P, where

[36]

Nu = total no. of streams of all orders

P = perimeter (km)

Length of Overland Flow (km) Lo

Lo = ½ Dd, where

[36]

Dd = drainage density

Shape parameters

Form Factor (Rf)

Rf = A/Lb2, where

[36]

A = area of the basin (km2)

Lb = basin length (km)

Shape Factor (Bs)

Bs = Lb2/A, where

[17]

Lb = basin length (km)

A = area of the basin (km2)

Elongation Ratio (Re)

Re = 1.128, where,

[37]

A = area of the basin (km2)

Lb = basin length (km)

Compactness Coefficient (Cc)

, where

[36]

P = perimeter of the basin (km)

A = area of the basin (km2)

Circularity Ratio (Rc)

Rc = 4 × ᴨ × A/P2, where ᴨ = 3.14

[38]

A = area of the basin (km2)

P = perimeter (km)