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URBAN DRAINAGE (River Restoration = The return of a river to its natural…
URBAN DRAINAGE
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Urban Precipitation = Rains more than rural areas because its warmer and there are more condensation nuclei
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Surface Runoff = Increased in urban areas because of the impermeable surfaces. However, there are more drainage systems
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Evapotranspiration = Much less in urban areas because there is less vegetation, faster runoff and less surface water
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Problems caused:
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Pollution = oil, heavy metals and plastic get washed straight into rivers
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URBAN HYDROGRAPHS
Lagtime = Urban drainage basins have shorter lagtimes 'Flashy'
Peak Discharge = Urban rivers tend to have higher peak discharge (more likely to flood)
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CBD =
Less vegetation
Lowest levels of evapotranspiration throughout the city
Least infiltration as there is too much concrete
More concrete causes higher levels of surface runoff
SUBURBS TO RURAL-URBAN FRINGE =
Amounts of vegetation and surface water increase allowing higher levels of evapotranspiration and infiltration (More gardens, parks) Less concrete