Morphometric parameters Formula/definition References I. Drainage network 1) Stream order (u) Hierarchical rank [10] 2) No. of streams (Nu) N = N1 + N2 + ∙∙∙ + Nn [7] 3) Stream length (Lu) km Lu = L1 + L2 + ∙∙∙ + Ln (km) [3] 4) Mean stream length (Lsm) km Lsm = Lu/Nu (km) [3] 5) Stream length ratio (RL) RL = Lu/Lu−1, where Lu = the total stream length of order “u”, Lu−1 = the total stream length of its next lower order [7] 6) Bifurcation ratio (Rb) Rb = Nu/Nu+1, where Nu = total no. of stream segments of order “u”, Nu+1 = no. of segments of the next higher order [8] 7) Mean bifurcation ratio (Rbm) Rbm = average of bifurcation ratio of Strahler all orders [10] II. Basin geometry 8) Basin length (Lb) km Length of the basin (km) [7] 9) Basin area (A) km2 Plan area of the watershed (km2) [7] 10) Basin perimeter (P) km Perimeter of the watershed (km) [7] 11) Form factor (ratio) (Rf) [7] 12) Elongation ratio (Re) [8] 13) Shape factor (Bs) [7] 14) Lemniscate ratio (k) K = L2/4A [48] [49] 15) Circularity ratio (Rc) Rc = 4*π*A/P2 [3] [50] 16) Drainage texture (Dt) Dt = Nu/P, where Nu = Total no. Streams of all orders, P = perimeter (km) [7] III. Drainage texture analysis 17) Stream frequency (Fs) Fs = Nu/A [7] 18) Drainage density (Dd) km/km2 Dd = Lu/A [7] 19) Drainage intensity (Di) Di = Fs/Dd [55] 20) Length of overland flow (Lo) km Lo = 1/2 Dd [7] IV. Relief characteristics 21) Basin relief (Bh) or total relief (H) m Bh = h − h1, where, h = maximum height (m), h1 = minimum height (m) [9] 22) Relief ratio (Rr) Rr = H/Lb, Where H = total relief, Lb = basin length [3] 23) Ruggedness number (Rn) Rn = Dd*(Bh/1000) [3] 24) Dissection index (Dis) Dis = Bh/Ra, where Ra = absolute relief [56] 25) Hypsometric curve (HC) HC is achieved by plotting the proportion of the total height (h/H) against the proportion of the total area (a/A) of the basin, where H is the total relief height, a is the total area of the basin above a given line of elevation h. [2] [3] [38] 26) Hypsometric integral (Hi) , where = the weighted mean elevation H = maximum elevation h = minimum elevation [2] [38]