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The slope of the Bilate catchment was classified into five slope classes: very high slope, high slope, medium slope, low slope, and very low slope. The slope of the Bilate catchment fluctuates from 0° to 66° (Figure 3(c)). It is observed that the slope range (0°–3.4°) covered the largest land 2,133.2 km2 (37.9%) (Table 5). In hydrological research, slope is a significant topographic factor in controlling the flow of surface water (Tehrany et al. 2013). According to Zaharia et al. (2019), regions with slopes greater than 15° have less water accumulation. The obtained average slope causing flood in the catchment was 5.13°.

Table 5

The slope factor of the Bilate catchment

Slope (°)Area (km2)Area (%)
0–3.4 2,133.2 37.9 
3.5–7.3 1,902.3 33.8 
7.4–13 560.5 10 
14–22 892.9 15.9 
23–66 136.0 2.4 
Total 5,625 100 
Slope (°)Area (km2)Area (%)
0–3.4 2,133.2 37.9 
3.5–7.3 1,902.3 33.8 
7.4–13 560.5 10 
14–22 892.9 15.9 
23–66 136.0 2.4 
Total 5,625 100 

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