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Dams or no dams97
 

Dams or no dams97

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    Dams or no dams97 Dams or no dams97 Presentation Transcript

    • Presented By : Talha ArfiRegistration # 20090498
    • PRESENTATION SCHEMEWhy Dams?What is Dam?Types of DamsUses Of DamsDams-StatisticsImpacts of DamsConclusion
    • WHY DAMS?Water is essential for sustaining all life.Population movement and increase require water year round in remote areas.Water collection and utilization is important.Ability to sustain dough and dry situations.
    • WHAT IS DAM?A structure to contain water.A solid barrier constructed at a suitable location across a river valley.Has mechanically engineered structure to direct and control flow of water and storage.
    • TYPES OF DAMS Gravity Dam Arch DamButtress Dam Embankment Dam
    • USES OF DAMSDirect Water UsageIndirect Uses
    • DIRECT WATER USAGEPrivate/DomesticCommercialIrrigationLivestockIndustrialMiningGeneral Public Supply
    • INDIRECT USESHydroelectric PowerFlood ControlTransportation
    • DAMS STATISTICSBy the end of the 20th century , there were 45,000 large dams built in 150 countries . International Commission on Large Dams (ICOLD)Displacement of 4 million people annually due to dams.Approximately 1,700 dams are being built , at the cost of about 50 million dollars per year.19% of electricity from hydro power-more than 50% in 63 countries.12% of all dams have a water supply function.75 countries have dams for flood control.Dam supports 30-40% of irrigated area and 12-16% of global food production. World Commission on Dams (WCD)
    • IMPACTS OF DAMSEnvironmental ImpactsSociological ImpactsEconomical ImpactsEffects of Dams on Water Quality
    • Environmental ImpactsRiver PollutionErosionLoss of Aesthetic ViewAir PollutionNoise PollutionDust
    • SOCIOLOGICAL IMPACTSIndigenous People AffectedLoss of EcosystemsLoss of SpeciesDisplacement Of People
    • DISPLACEMENT OF PEOPLE BY DAMS
    • ECONOMICAL IMPACTSAgriculturePower GenerationWater SupplyEmployment
    • EFFECTSON WATER QUALITYChange in TemperatureTurbidityDissolved Gas in the WaterEutrophication
    • CONCLUSIONSmall dams should be built instead of large damsCareful planning throughout the site selection , design and construction of dam is criticalSociological impacts should be considered along with the main objectives of water supply , power generation and flood controlEconomic incentives should be weighed against sociological impacts
    • QUESTION & ANSWERS SESSION