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Model Project to Combat Desertification
In NARE Village, BURKINA FASO
Technical Report of the Subsurface Dam

FULL TEXT [PDF 4.87MB]
 
COVER [PDF 18KB]
Construction of the subsurface dam [PDF 135KB]
Project location [PDF 284KB]
Introduction [PDF 59KB]
Contents [PDF 98KB]
1. General description of the Model Project to Combat Desertification and evaluation of its results [PDF 106KB]
1-1 History and aim of the project [PDF 85KB]
1-2 Execution of the project [PDF 89KB]
1-3 Organizational framework of the project [PDF 87KB]
1-4 Outline of the facilities for the demonstration studies [PDF 84KB]
1-5 Evaluation of the results of the project and prospects [PDF 89KB]
2. What is a subsurface dam? [PDF 184KB]
2-1 Concept and principle of a subsurface dam [PDF 126KB]
2-2 Advantages of a subsurface dam [PDF 79KB]
2-3 Disadvantages of a subsurface dam [PDF 82KB]
2-4 Requirements for a subsurface dam site [PDF 113KB]
2-5 "Fossil valley", a suitable site for a subsurface dam [PDF 85KB]
3. Survey to select the subsurface dam site [PDF 1,291KB]
3-1 Outline of the survey methods [PDF 87KB]
3-2 Selection of the project area [PDF 94KB]
3-3 Distribution of fossil valleys in West Africa [PDF 174KB]
3-4 Surveys carried out in this project [PDF 97KB]
　3-4-1 Interpretation of satellite images and aero-photographs [PDF 787KB]
　3-4-2 Field exporation [PDF 130KB]
　3-4-3 Geophysical survey [PDF 453KB]
3-5 Detailed field surveys (test drillings, permeability tests, and observations of groundwater level) [PDF 135KB]
3-6 Socio-economic study [PDF 101KB]
4. Construction of a subsurface dam [PDF 584KB]
　4-1 Methods of construction of a subsurface dam [PDF 87KB]
　4-2 Characteristics of the subsurface dam built at Nare [PDF 184KB]
　4-3 Construction of the subsurface dam [PDF 463KB]
5. Structure of the "fossil valley" at Nare [PDF 282KB]
6. Observations of the water storage state by the subsurface dam [PDF 1,394KB]
6-1 Facilities for observation of water storage state (facilities for groundwater observation) [PDF 241KB]
6-2 Results of observation of meteorology and rate of streamflow [PDF 122KB]
6-3 Fluctuation in the groundwater level in the reservoir area [PDF 990KB]
6-4 Analysis of seasonal fluctuation in the reserved water level [PDF 280KB]
6-5 Analysis of water storage state by the subsurface dam [PDF 145KB]
7. Other studies [PDF 596KB]
8. Recommendations for future subsurface dam projects [PDF 102KB]
8-1 Selection of subsurface dam sites [PDF 89KB]
8-2 Survey methods [PDF 90KB]
8-3 Methods of construction of a subsurface dam [PDF 89KB]
8-4 Costs [PDF 84KB]
8-5 Management and maintenance system [PDF 84KB]
Acknowledgements [PDF 84KB]