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

Geoenvironmental Disasters

Table 4 Showing FR values for drainage buffer classes

Factor	Factor class	No. of points	% of points	class area	% of class area	Frequency ratio	Relative frequency
Drainage buffer	< 500 M	89,127.17	83.18	257,741	44.47	1.87	0.75
	500 m-1KM	17,066.91	15.92	166,659	28.75	0.55	0.22
	1KM-2KM	948.16	0.88	133,386	23.01	0.03	0.01
	2KM-3KM	0		18,938	3.26	0	0
	3KM-5KM	0		2859	0.49	0	0
	Sum	107,142.2	100	579,800	100	2.46	1