SubSurface Dams - Sustainable Sanitation and Water Management ...

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SandysiltSiltSand(white)Sand(moist)Silty sandSand(with coal)BasementrockFig. 6.6: Results of observation using "set of piezometers of different depths " (at observationwell PC) (20 July 2000)61
6-5 Analysis of water storage state by the subsurface damFrom the results of the study and the observation described above, an analysis of the waterstorage mechanism by the subsurface dam was carried out according to the flow chart shownin Fig. 6.7.This report only shows the results of the analysis, omitting the details of the analysis process.Because of the constraints of the data available, a very simplified method was used for theanalysis. Hereafter, further improvement can be examined in the analysis.Results ofobservation of dailyrainfallResults ofobservation of rateof streamflowResults ofobservation ofgroundwaterResults ofgeological surveyStatistical analysis onrelation between rainfallwithin drainage basin andrate of streamflowExamination of relationbetween rate ofstreamflow and rechargeof groundwaterWater balance analysis onrelation amongrecharge of groundwater,water storage,and water leakagein the reservoir areaResults ofobservation ofevaporationExamination of relation betweenrainfall within drainage basin andrecharge of groundwaterForecast of water storage in futureFig.6.7: Flowchart of analysis of the water-storage mechanism62
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Photo: Construction of the subsurfa
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Subsurface DamSmall-Scale Surface D
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ContentsIntroduction1. General desc
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1. General description of the Model
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Department of the Environmentand Fr
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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 32 and 33: Groundwater level assumed from the
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 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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