Hydrogeology and siting of micro-dams around Léo Burkina Faso

Hydrogeology and siting of micro-dams around Léo, Burkina Faso14 June 20106 Potential additional new sites for micro-dam construction6.1 IntroductionOn request of CREDO two additional sites that are potential locations for a micro-dam have beenvisited, although they are not among the five proposed sites for the current project. One of them(Yelbouga) is on a waiting list. At the other site (Bonapia) construction of the dam is about to start. Thelocation of these sites is presented in Figure 7.6.2 YelbougaYelbouga (or Yélébouga as indicated on some maps) is located about 21 km East of Léo.Figure 27 Overview of the Yelbouga dam siteAt this site an old dam is present, after 22 years it has breached a few years ago. With the propermaterials and funding the dam can probably relatively easily be fixed with the construction of aproper (concrete) spillway.Drinking water is currently fetched from a number of water points in the village all connected to asingle borehole with a high yield (a so called “APS”). Since there is no longer a surface water reservoirdrinking water for the cattle also relies on these water points, making them very busy.6.3 BonapiaBonapia (or Banapio as indicated on some maps) is located about 33 km North of Léo.Figure 28 Overview of the Bonapia dam siteThe potential dam site is located in a forested part of the riverbed with relatively steep slopes of theriverbanks.28