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PREDICTION AND ASSESSMENT OF IMPACTS – SURFACE WATER ENVIRONMENT (SWE)

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Presentation on theme: "PREDICTION AND ASSESSMENT OF IMPACTS – SURFACE WATER ENVIRONMENT (SWE)"— Presentation transcript:

1 PREDICTION AND ASSESSMENT OF IMPACTS – SURFACE WATER ENVIRONMENT (SWE)

2 INTRODUCTION SWE EXAMPLES OF PROJECT WHICH CREATE IMPACT ON SWE – Industrial plants or power plants withdrawing surface water for use as cooling water – power plants discharging heated wastewater – industries discharging process wastewater – Municipal WWTP – dredging projects – project involving fill or creation of fast lands along rivers, lakes, estuaries and coastal areas – surface mining projects – construction of dams – River channelization projects – deforestation and agricultural development – commercial hazardous – waste disposal sites – tourism projects

3 BASIC INFORMATION ON SW QUANTITY & QUALITY SURFACE WATER HYDROLOG

4 SW QUALITY PARAMETERS Surface water comprises - rainfall, runoff, base flow – Each of this input components can affect water quality – Rainfall – acid rain (industrialized area), Runoff – Nutrients and sediments- base flow – elevated levels of hardness – Human activities – increase the pollutant loads to this inputs Discharge of wastewater – increase organic load in surface water Construction activities – increased erosion and sediment load – Surface water pollution can be defined as – Excessive conc. Of particular pollutant for sufficient periods of time to cause identifiable effects – Water quality defined as in terms of physical, chemical and biological characterization of water Physical parameters include : color, odur, temp. solids, turbidity, oil and grease Each physical parameter can be broken down into sub categories

5 SW QUALITY PARAMETERS SWPI – associated with construction project – two main sources of water pollutant should be considered – NON POINT: referred as area or diffuse sources It reffer to those substances which can be introduced into receiving waters as a result of urban-area, industrial-area or rural runoff – POINT : related to specific discharges from municipalities or industrial complexes E.g. organics enter in to surface water as a result of discharge from a manufacturing plant

6 NP – discharges enter surface water in a diffuse manner and at intermittent intervals- related to meteorological events Pollution arise over extensive area of land and it travels via transit land before enter in SW It cant be monitored at the point of origin and exact source is difficult or impossible to trace Elimination or control of these pollutants must be directed at specific sites Most effective and economic controls are land management techniques and conservation practices GENERAL CHARACTERISTICS OF NP

7 The effect of pollutant Depends upon conc. and type of pollutant. Soluble organics (BOD)- decrease DO, biomagnified SS – water clarity, decrease photosynthesis, settled SS for sludge bed- affect benthic ecosystem N and P – Eutrophication Chloride – cause salty taste in water Acids, alkalis, toxic substances – toxic to fish and other aquatic organisms Thermal – imbalance and reduction in waste assimilative capacity


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