Presentation on theme: "The Causes,Effects and Management of Flooding in Loughton Loughton Brook."— Presentation transcript:
The Causes,Effects and Management of Flooding in Loughton Loughton Brook
What is flooding? Flooding is the result of a river discharge exceeding its bankfull capacity Loughton Brook is managed to prevent flooding
Is Flooding a Natural or man made event? It is a natural event but is made worse by human activity.
When is flooding a problem?
When is flooding not a problem? Think about the areas in which it can occur and the damage.
What factors affect how quickly a river responds to rainfall? Try to think of at least three each before following onto the next slide.
It is affected by: The Lag time –Size of drainage basin –Geology –Steep valley sides –Land use e.g. urban / rural –Type of precipitation –Number of rivers in a drainage basin
How do people change these factors? Deforestation –Decreased interception of rainfall and increased run-off due to soil erosion. Urbanisation –Concrete structures are impermeable.
Why do people live in areas at risk from flooding? Areas of flooding are usually on flat land. What is this ideal for? Flooding can create fertile soil, what would this be useful for? Historic reasons en.academic.ru
What responses are there to the flood risk? Hard engineering –Channel straightening –Dams & storage ponds Soft Engineering –Aforestation Do nothing –Allow areas to flood – compensation?