Hydrological Disasters

Question 1

Flood areas have of risk

Answer 1

Lowland
Coastlines
Mountain valleys
River deltas

Question 2

Causes of floods

Answer 2

Heavy precipitation
Hurricane storm surges
Tsunamis
Snowmelt

Question 3

Infiltration

Answer 3

The process in which water enters the ground

Question 4

Percolation

Answer 4

The action of water moving through or being filtered through the ground

Question 5

Runoff

Answer 5

Water unable to enter the ground and flowing off the surface

Question 6

Floodplain

Answer 6

Area of flat low lying ground adjacent to a river formed mainly of river sediments and subject to flooding

Question 7

Slab

Answer 7

A mass of snow that is put into motion as a unit when the avalanche is released. Slavs form as a result of heavy snow or wind

Question 8

Weak layer

Answer 8

Made of unstable snow that can easily collapse under stress. Result of day to day weather condition

Question 9

Sliding surface

Answer 9

A layer of strong smooth snow under the weak layer that’s provides a surface on which the avalanche can move on. Forms well in advance.

Question 10

Slope angles 30-45 degrees

Answer 10

Best for avalanches

Question 11

Wind

Answer 11

Wind blown snow contributes to the formation of the slab

Question 12

Temp

Answer 12

High or low contributes to formation of weak layers

Question 13

Precip

Answer 13

Large snowfalls followed by rain create sliding surfaces

Question 14

Afforestation

Question 15

Active control triggering

Question 16

Starting zone structures

Question 17

Avalanche zoning

Question 18

Architecture defences

Question 19

Deflective structures

Question 20

Snow sheds