Factors effecting the shape of a storm Hydrograph

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  • factors affecting a hydrograph
    • Basin size
      • Smaller basins lead to a rapid water transfer and so create a flashy hydrograph. Larger basins result in slow water transfer and so a subdued hydrograph.
    • Drainage density
      • lots of streams and tributaries allow faster water transfer and so create a flashy hydrograph. Less of them lead to slower water transfer and so a subdued hydrograph
    • Basin shape
      • Steeper sides are linked to flashy hydrographs, shallow sides are linked to subdued hydrographs
    • Deforestation
      • less vegetation leads to more surface runoff so a flashy hydrograph, more vegetation leads to a subdued hydrograph
    • relief
      • low-lying land will collect more water and lead to a flashy hydrograph, higher areas are more likely to drain water and lead to a subdued hydrograph
    • soil water state
      • soil that is already saturated cannot absorb water which leads to a flashy hydrograph, dry ground will lead to a subdued hydrograph
    • Agriculture
      • more agriculture means more land has been cleared which leads to more runoff and so a flashy hydrograph, less agriculture leads to a subdued hydrograph
    • Rainfall intensity
      • heavy rainfall produces more water and leads to a flashy hydrograph, lighter rainfall leads to a subdued hydrograph
    • Urbanisation
      • urbanisation leads to more impermeable surfaces which leads to a flashy hydrograph
    • vegetation cover and type
      • less vegetation leads to a flashy hydrograph, more leads to a subdued hydrograph

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