GIS-based gully erosion susceptibility modeling, adapting bivariate statistical method and AHP approach in Gombe town and environs Northeast Nigeria

Geoenvironmental Disasters

Table 9 Showing FR values for TWI classes

	factor classes	No. of points	% of points	class area	% of class area	Frequency ratio	Relative frequency
TWI	< 7.0	36,030.13	33.62	250,191	43.14	0.77	0.14
	7.0–8.5	38,874.62	36.28	213,435	36.81	0.98	0.18
	8.5–10.6	15,170.58	14.15	79,075	13.63	1.03	0.19
	> 10.6	17,066.91	15.92	37,118	6.40	2.48	0.47
	Sum	107,142.2	100	579,819	100	5.29	1