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Figure 3(f) shows that the upstream of the catchment receives the high annual rainfall, whereas the downstream of the watershed receives the low annual rainfall. Even though the upstream rainfall amount is slightly higher than that of the downstream rainfall of the catchment, the downstream areas have relatively flat topography and flat slope, which indicate it is highly vulnerable to flood hazard. According to Radwan et al. (2019), flood hazard increases with an increase in precipitation. Table 8 shows the various average rainfall classes, which are very low (925–1,000 mm), low (1,001–1,100 mm), medium (1,101–1,253 mm), high (1,254–1,300 mm) and very high (1,301–1,400 mm) rainfall, respectively.

Table 8

The rainfall factor of the Bilate catchment

Rainfall (mm)Area (km2)Area (%)
925–1,000 200.9 3.6 
1,001–1,100 902.3 16 
1,101–1,253 560.5 10 
1,254–1,300 3,925.2 69.8 
1,301–1,400 36.0 0.6 
Total 5,625 100 
Rainfall (mm)Area (km2)Area (%)
925–1,000 200.9 3.6 
1,001–1,100 902.3 16 
1,101–1,253 560.5 10 
1,254–1,300 3,925.2 69.8 
1,301–1,400 36.0 0.6 
Total 5,625 100 

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