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The soil groups of the study area are reclassified into the following five classes: Pellic vertisols, Euric fluvisols, Leptosols, Chromic vertisols, and Orthic solonchaks (Figure 3(b)). The Leptosols and Pellic vertisols are the dominant soil type in the Bilate catchment (Table 4) and cover an area of 2,123.3 km2 (37.7%) and 1,830.7 km2 (32.5%), respectively. The nature of the soil in a given area influences the flood levels and possibly regulates the infiltration capacity. Leptosols have a high infiltration rate and a high degree of a flood risk.

Table 4

The soil type factor of the Bilate catchment

Soil typesArea (km2)Area (%)
Pellic vertisols 1,830.7 32.5 
Euric fluvisols 265.9 4.7 
Leptosols 2,123.3 37.7 
Chromic vertisols 1,077.2 19.2 
Orthic solonchaks 328 5.8 
Total 5,625 100 
Soil typesArea (km2)Area (%)
Pellic vertisols 1,830.7 32.5 
Euric fluvisols 265.9 4.7 
Leptosols 2,123.3 37.7 
Chromic vertisols 1,077.2 19.2 
Orthic solonchaks 328 5.8 
Total 5,625 100 

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