35 practice sets · Page 2 of 2
Which of the following is used to estimate which areas will be inundated during a flood, based on river height information?
satellite and radar images
flood maps / floodplain hydraulicmodels
river gauging stations
all of the above
A flood can be caused by:
Rising rivers
High tides
Heavy rain in a small area
All of the above
Dams are designed to reduce flooding by
protecting river banks from erosion
providing storage for flood water
increasing the downstream velocity of flood water
trapping sediment behind the dam so it cant be deposited downstream
Which of these problems can be caused by floods?
Landslips
Sewage contamination
Destroyed crops
All of the above
As the discharge in a stream increases, load usually
increases
decreases
stays the same
none of the above
Which of the following should you do in a flood?
Go sight-seeing
Drink the water
Put valuables high up
Water the garden
Which is the most common type of disaster in New Zealand?
Floods
Earthquakes
Tsunami
Volcanoes
Flood can not occur due to
Biological disaster
Cyclone
Tsunami
Heavy rain
Flash floods are often caused
by river beds that are too high
by thunderstorms
dikes and dams that are too high
by rainfall over many days
The lowest level to which a stream may erode is called
discharge
base level
gradient
velocity
The change in elevation of a stream per unit length is called
discharge
base level
gradient
velocity
Which is not a characteristic of a regional flood?
Floodplains covered with floodwaters
An extended rise of river elevation for weeks to months
Large storm systems or an extended period of rainfall
A small drainage basin.
The tsunami that killed over 250,000 people in south and southeast Asia in 2004 was caused by
a tropical storm
a volcanic explosion
an earthquake
a hurricane
What is a flash flood?
A flood that happens fast with little warning
A sophisticated flood
Power lines fallen in flood waters
A deep flood
How many feet of fast-moving flood water can sweep a vehicle away?
3 feet
2 feet
4 feet
