1.4 The human impact Flashcards Preview

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Flashcards in 1.4 The human impact Deck (14)
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1

Abstraction

Amount taking out

2

Bankfull stage

Condition in which a river's channel fills completely that any increase in discharge will cause water to overflow the bank

3

Channel

Passageway in which a river flows

4

Channelisation

Modifications to the river channels. (straightening, deepening, widening, clearing or lining.

5

Discharge

Quantity of water that passes a given point on the bank of a river.

6

Drainage basin

Total area that contributes water to a river.

7

Flash flood

Flood where lag time is quite short

8

Flood

Discharge great enough to cause a body of water to overflow its channel.

9

Flood-Frequency curve

How often and how large floods are in an specific area

10

Floodplain

Part of any stream valley that is inundated during floods

11

Hazard assessment

Process of determining when and where hazards have occurred in the past. The frequency as well as events that could happen now.

12

Natural hazards

Range of natural circumstances, materials and processes that are hazardous to humans.

13

Risk assesment

Establishing the probability that a hazardous event of a particular magnitude will occur within a given period.

14

Flood abatement

Decreasing the amount of runoff