Morphometric Parameters

Formula/Definition

References

I

Basic Parameters

1

Basin area (A) (Km²)

Plan area of the watershed (Km²)

[51]

2

Basin perimeter (P) (Km)

Perimeter of the watershed (Km)

[51]

3

Basin length (L_b) Km

Length of the basin (Km)

[51]

4

Stream order (N_u)

Hierarchical Rank

[49]

5

Stream length (L_u) Kms

L_u = L₁ + L₂, ・・・, L_n

[39]

6

Mean stream length (L_sm) (Km)

L_sm = L_u/N_u (Km)

[39]

7

Maximum and minimum heights (H, h) m

[8]

8

Slope(S_b)

[8]

II

Derived Parameters

9

Bifurcation ratio (R_b)

R_b = N_u/N_u + 1, where N_u = total no. of stream segments of oder “u”, N_u + 1 = no. of segments of the next high order

[59]

10

Mean bifurcation ratio (R_bm)

R_bm = average of bifurcation ratio of Strahler all order.

[49]

11

Stream Length ratio (R_L)

R_L = L_u/L_u − 1, where L_u = the total stream length of order “u”, L_u − 1 = No. of segment of the next lower order.

[39]

12

RHO coefficient (ρ)

ρ = R_L/R_b

[51]

13

Stream frequency (F_s)

F_s = N_u/A

[51]

14

Drainage density (D_d) Km/Km²

D_d = L_u/A

[51]

15

Drainage texture (D_t)

D_t = N_u/P, where N_u = Total no. of streams of all orders, P = perimeter (Km)

[51]

16

Basin relief (B_h) m

B_h = H_max − H_min, where, H_max = maximum height

(m), and H_min = minimum height (m)

[60]

17

Relief ratio (R_r)

R_r = H/L_b, where, H = Total relief, and L_b = basin length

[39]

18

Ruggedness number (R_n)

R_n = D_d*(B_h/1000)

[39]

19

Hypsometric integral (HI)

HI = (H_mean − H)/(H − h), where H = max. elevation, and h = min. elevation

[48]

III

Shape Parameters

20

Elongation ratio (R_e)

R_e =

[59]

21

Circularity ratio (R_c)

R_c = 4*π*A/p²

[70]

22

Form factor (ratio) (R_f)

R_f = A/L_b²

[51]