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Why do some rivers Flood? Factors making a flashy hydrograph.

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Presentation on theme: "Why do some rivers Flood? Factors making a flashy hydrograph."— Presentation transcript:

1 Why do some rivers Flood? Factors making a flashy hydrograph

2 Flashy and Flat Hydrographs

3 Precipitation intensity Torrential Rain And so?

4 Precipitation intensity Torrential Rain Ground cant absorb it fast enough – overland flow Flash Flood

5 Steady Rain And so? Factor 1 – Precipitation intensity

6 snowfall And so? Factor 1 – Precipitation type snowfall And so?

7 Types of Underlying Rock Granite is impermeable And so

8 Types of Underlying Rock chalk and most limestones re permeable And so

9 Soils Sand is permeable but clay is impermeable And so

10 Soils – saturated / frozen Sand and clay if saturated or frozen are impermeable And so

11 Forested Forest much interception And so

12 Deforested Deforested no interception And so

13 Urbanisation Covers ground in impermeable materials And so

14 Urbanisation Installs storm drains And so


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