DEM data used in this study have a spatial resolution of 30 × 30 m. It was obtained from the United States Geological Survey website (https://earthexplorer.usgs.gov/). The DEM was used to delineate the watershed, slope classification and to generate the hydrological response units (HRUs). In total, 21 HRUs were delineated in the NRB, with slopes varying from 0 to 69% (Table 1). The dominant slope class (14–69%) which covers 1.81% of the total area of the basin is mostly found in its North West part (Figure 2). The slopes of 0–3%, 4–7% and 8–13%, respectively, occupy 41.09, 38.28 and 18.82% of the watershed. These three slope classes are observed more in the East and middle parts of the NRB (Figure 2).

Table 1

Statistics relating to certain physical parameters (soil types, altitudes and slopes) of the Nyong watershed

Soils
Altitudes (m)
Slopes (%)
SWAT soil codesArea (km2)Basin occupancy rate (%)ClassesArea (km2)Basin occupancy rate (%)ClassesArea (km2)Basin occupancy rate (%)
Ao7-436 307.94 2.13 637–693 5,648.55 39.12 0–3 5,932.67 41.09 
Fo1-ab-481 9,269.48 64.20 694–724 6,382.61 44.21 4–7 5,527.4 38.28 
Fo14–2a-1162 6.44 0.04 725–817 2,332.40 16.15 8–13 2,716.6 18.82 
Fo26-ab-490 370.48 2.57 818–1,210 74.44 0.52 14–69 261.33 1.81 
Fo35–494 4,483.66 31.05 – – – – – – 
Soils
Altitudes (m)
Slopes (%)
SWAT soil codesArea (km2)Basin occupancy rate (%)ClassesArea (km2)Basin occupancy rate (%)ClassesArea (km2)Basin occupancy rate (%)
Ao7-436 307.94 2.13 637–693 5,648.55 39.12 0–3 5,932.67 41.09 
Fo1-ab-481 9,269.48 64.20 694–724 6,382.61 44.21 4–7 5,527.4 38.28 
Fo14–2a-1162 6.44 0.04 725–817 2,332.40 16.15 8–13 2,716.6 18.82 
Fo26-ab-490 370.48 2.57 818–1,210 74.44 0.52 14–69 261.33 1.81 
Fo35–494 4,483.66 31.05 – – – – – – 

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