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GEOGRAPHY REVISION ­ HYDROLOGY




Physical Characteristics of the Drainage Basin that either Increase/Decrease the risk of Flooding.

1. Permeable and Impermeable rocks.

Impermeable rocks like slate and marble do not allow water to enter and so the precipitation stays
on the ground and is more prone to surface run off.…

Page 2

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GEOGRAPHY REVISION ­ HYDROLOGY




Indirect Human Factors Affecting the Risk of Floods:

1. Urbanisation

Urbanisation is a human factor which influences the flood risk in that. Urbanisation is the conversion of
the land from rural land in to housing, offices, factories and roads. Urban areas have many
impermeable surfaces for…

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GEOGRAPHY REVISION ­ HYDROLOGY




Case Study: Boscastle, North Cornwall.

When: On 16th of August estimated 2 millimetres worth of precipitation fell over a small river
catchment of 20km squared.

Causes of the flood:

Characteristic of the Precipitation accounted for the flooding of the River Valency where 70mm
of rain fall…

Page 4

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GEOGRAPHY REVISION ­ HYDROLOGY




Management: Flood Defence Scheme for the Valancy:

The diagram
below shows the
many various
strategies
implemented to
decrease the risk
of flooding in
Boscastle.




Flood Defence Schemes:
Removing trees so they don't act as debris.
Dredging of the Valancy downstream in order to allow the Valancy…

Page 5

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GEOGRAPHY REVISION ­ HYDROLOGY




flood event is the same and so the trees may not be an issue again and they may not be debris the
next time a flood happens.

Flood Management for such an extreme flood event cannot be done without spoiling the character
of the village.



Case…

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GEOGRAPHY REVISION ­ HYDROLOGY




Channel Dredging would not be effective in Shrewsbury as the channel would eventually silt up
again and it would be environmentally damaging. Also it would cost 45 million pounds, and so this
method was not used.




Case Study: Brisbane River, Queensland Floods. Australia.

The Brisbane River…

Page 7

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GEOGRAPHY REVISION ­ HYDROLOGY




Land was not usable as a large percentage of land was still covered in water in the aftermath of the
flooding.
Many homes, up to 20 000 in Brisbane, were inundated
About 300 roads were closed, including nine major highways

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