Preprocessing and Data Used

 

 Elevation Data

 

fig2-11

                             The Digital Elevation Model derived from Light Detection and Ranging (LiDAR) was used in the hydraulic model generation. Specifically the edited LiDAR Digital Terrain Model (DTM) was used. The surveyed bathymetric data was also already incorporated in the DTM used to represent the terrain beneath the water surface. Figure 3 1 shows the DTM used in the generation of the hydraulic model of Mananga River.

 

 

 

 

 

 

 

Land Cover and Soil Type Data

Land cover map of Mananga Watershed

Land cover map of Mananga Watershed

Soil map of Mananga Watershed

Soil map of Mananga Watershed

 

The land cover shapefile was obtained from the National Mapping and Resource information Authority (NAMRIA). Figure 3 2 1 shows the land cover map of the Mananga Watershed. The land cover together with the soil type is used in the estimation of losses in the watershed. The soil map is presented in Figure 3 2-2. The soil type data was acquired from Mines and Geosciences Bureau.