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Table 1

Basin shape descriptors in hydrology and geomorphology

Watershed shape descriptor	Expression	Range
Form factor	FF_w = A/L²	(0,1)
Basin shape factor	B_s = L²/A	(1, ∞)
Elongation ratio	R_e = 1.128A^0.5/L	(0,1]
Circularity ratio	R_c = 12.57A/P²	(0,1]
Compactness coefficient	C_c = 0.2821P/A^0.5	[1,∞)

Watershed shape descriptor	Expression	Range
Form factor	FF_w = A/L²	(0,1)
Basin shape factor	B_s = L²/A	(1, ∞)
Elongation ratio	R_e = 1.128A^0.5/L	(0,1]
Circularity ratio	R_c = 12.57A/P²	(0,1]
Compactness coefficient	C_c = 0.2821P/A^0.5	[1,∞)