Spatial modeling of erosion hotspots using GIS-RUSLE interface in Omo-Gibe river basin, Southern Ethiopia: implication for soil and water conservation planning

Environmental Systems Research

Table 5 Soil loss rates and severity classes of major sub basins

Sub basin number	Severity class (t/ha/yr) and area coverage (ha)						Total soil loss (Mt yr⁻¹)	% of total
Sub basin number	0–7 (Low)	7–15 (Moderate)	15–25 (High)	25–45 (Very high)	45–60 (Sever)	> 60 (Very sever)	Total soil loss (Mt yr⁻¹)	% of total
I	376,147	146,135	57,245	64,756	22,812	40,894	10.2	11.4
II	124,953	98,333	45,701	49,757	23,527	30,425	7.5	8.4
III	107,982	112,256	51,255	34,514	17,050	28,288	7.0	7.8
IV	451,716	311,471	163,745	189,804	133,461	212,611	39.4	44.0
V	232,224	122,190	44,215	38,450	22,625	20,487	6.6	7.4
VI	754,750	97,701	50,514	45,653	28,050	26,931	7.7	8.6
VII	312,049	85,535	47,791	51,493	25,535	39,797	8.6	9.6
VIII	702,465	38,368	31,665	25,619	4062	3403	2.6	2.9
Total	3,062,286	1,011,989	492,131	500,046	277,122	402,836	89.6	–
% Area	53.29	17.61	8.56	8.70	4.82	7.01	–	–
Priority	6th	5th	4th	3rd	2nd	1st	–	–

I = Gigel Gibe, II = Gojeb, III = Guma Danchiya, IV = Weyibe Zigna Zege, V = Sherma, VI = Muwi Omo, VII = Berso Neri Kako & VIII = Hamerkake Omo