SubSurface Dams - Sustainable Sanitation and Water Management ...

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Groundwater level assumed from the results of electricsoundings and observation in boreholesMain road between Ougadougou andKayaDivisionElectric resistivity(Ω-m)Meaning2910~150>1000Topsoil (clay-sand)Weathered crust( gravel and rock)Depth (m)Electricresistivity (Ω-m)50-100, one part ofwhich is lower than50800~>1000Heavily weathered layer ofbasement rock(clay, partially gravel)Slightly weatheredbasement rockVariableOld river sediment (abovethe groundwater level)
30DivisionElectric resistivity(Ω-m) ***MeaningTopsoil- weathered crustMoist layer under thetopsoilDepth (m)Electricresistivity (Ω-m)50~80~variableHeavily weathered layerof basement rock(clay, partially gravel)Groundwater level observedin boreholesFig. 3.7-2: Resistivity profile at Koulikare point (Nare)Slightly weatheredbasement rockRiver sediment (abovethe groundwater level)River sediment (underthe groundwater level)30
Page 2 and 3: Photo: Construction of the subsurfa
Page 4 and 5: Subsurface DamSmall-Scale Surface D
Page 6 and 7: ContentsIntroduction1. General desc
Page 8 and 9: 1. General description of the Model
Page 10 and 11: Department of the Environmentand Fr
Page 12 and 13: According to the results of an anal
Page 14 and 15: A large amount of waterevaporates f
Page 16 and 17: y adopting an appropriate dam struc
Page 18 and 19: 2-5 "Fossil valley", a suitable sit
Page 20 and 21: temperature of 30 to 34 degrees and
Page 22 and 23: 3-3 Distribution of fossil valleys
Page 24 and 25: 3-4 Surveys carried out in this pro
Page 26 and 27: Satellite image of the area around
Page 28 and 29: 3-4-2 Field explorationAt the 5 sit
Page 30 and 31: 3-4-3 Geophysical surveyAt the 5 si
Page 34 and 35: 3-5 Detailed field surveys (test dr
Page 36 and 37: Groundwater level isalmost the same
Page 38 and 39: The village is on a peneplain with
Page 40 and 41: In this project at Nare, the "earth
Page 42 and 43: DownstreamFilled back soil3mCoarseg
Page 44 and 45: All the results of the quality test
Page 46 and 47: Photo 4.3: Construction of the subs
Page 48 and 49: 4) Basal stratum of the fossil vall
Page 50 and 51: 6. Observation of the water storage
Page 52 and 53: Table 6.1: Features of the faciliti
Page 54 and 55: PerchedwaterImpermeablelayer“Main
Page 56 and 57: Table 6.3: Annual rainfall in the K
Page 58 and 59: 3) The reserved water level during
Page 60 and 61: Ground surface level: 275.73mGround
Page 62 and 63: 6-4 Analysis of seasonal fluctuatio
Page 64 and 65: SandysiltSiltSand(white)Sand(moist)
Page 66 and 67: (1) Relation between the rainfall w
Page 68 and 69: 4) Subsequently, the cycle in which
Page 70 and 71: 7. Other studiesIn addition to the
Page 72 and 73: these facilities:- 3 mill stations,
Page 74 and 75: Photo 7.3: Water-supply station for
Page 76 and 77: 8. Recommendations for future subsu
Page 78 and 79: advisable to arrange rainfall stati
Page 80: AcknowledgementsThe Model Project t

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