Factors affecting discharge

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Factors affecting discharge

  1. 1. What is the issue here?
  2. 2. <ul><li>A FLOOD WARNING HAS BEEN ISSUED BY THE ENVIRONMENT AGENCY FOR RIVERSIDE PROPERTIES IN AN ESSEX TOWN AFTER HEAVY OVERNIGHT RAIN. </li></ul><ul><li>FLOODING IS EXPECTED IN THE RIVERSIDE AREAS OF CHELMSFORD TOWN CENTRE, INCLUDING THE CRICKET GROUND AND COURT INDUSTRIAL ESTATE. </li></ul><ul><li>RESIDENTS ARE ADVISED TO ACT IMMEDIATELY TO PROTECT PROPERTY. </li></ul><ul><li>SOME MOTORISTS HAD TO BE RESCUED FROM THEIR CARS AFTER ROADS FLOODED FOLLOWING THE HEAVY OVERNIGHT RAIN. </li></ul><ul><li>http://www.bbc.co.uk/news/uk-england-essex-12214641 </li></ul>
  3. 3. Water on the Land.
  4. 4. The Amount of water in a river fluctuates due to a number of reasons…. <ul><li>Factors affecting discharge. </li></ul>Rainfall temperature Previous weather conditions relief Rock type Land use
  5. 5. How do geographers measure responses to rainfall? <ul><li>Hydrographs are graphs which show river discharge over a given period of time and show the response of a drainage basin and its river to a period of rainfall. </li></ul><ul><li>A storm hydrograph shows how a river's discharge responds following a period of heavy rainfall. On a hydrograph, the flood is shown as a peak above the base (normal) flow of the river. </li></ul>
  6. 6. A Storm Hydrograph.

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