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Finding Potential Sites for Small-Scale Hydro Power in Uganda: a ...

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when construct<strong>in</strong>g a small-scale hydropower station. The majority would be happy tosacrifice a part of their property <strong>in</strong> order to get electricity, while 5% says that such asacrifice would br<strong>in</strong>g a too high loss <strong>in</strong> harvest <strong>in</strong>come generation.5.2 GIS Analysis5.2.1 InterpolationThe <strong>in</strong>terpolation turned out to be a rather time consum<strong>in</strong>g operation when work<strong>in</strong>g ona laptop computer. An <strong>in</strong>terpolation of the study area with 100-meter resolution neededapproximately 5 m<strong>in</strong>utes to complete, the 30-meter resolution 30 m<strong>in</strong>utes, while the 10-meter resolution <strong>in</strong>terpolation needed almost 4 hours.The output from all three <strong>in</strong>terpolations conta<strong>in</strong>ed a large amount of s<strong>in</strong>ks. As can beseen <strong>in</strong> Figure 5.4 the majority of s<strong>in</strong>ks were concentrated to areas of low slope angle,e.g. valley bottoms or areas between contours of same elevation. The areas oftenco<strong>in</strong>cide with areas conta<strong>in</strong><strong>in</strong>g rivers.Figure 5.4 Orig<strong>in</strong>al contours (brown l<strong>in</strong>es) and s<strong>in</strong>ks (blackdots).The s<strong>in</strong>ks have no significant <strong>in</strong>fluence on our analysis, s<strong>in</strong>ce their locations <strong>in</strong> the<strong>in</strong>terpolated DEMs often are <strong>in</strong> irrelevant areas, such as valley bottoms. Despite this, weper<strong>for</strong>med a fill s<strong>in</strong>k-function, which removed all exist<strong>in</strong>g s<strong>in</strong>ks, <strong>in</strong> order to receive amore accurate DEM.49

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