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WorksheetsTBSHS Year 7 geography. Flooding 1
Total questions: 10
Worksheet time: 5mins
The growth in urban areas has created more tarmac and concrete covered land meaning fewer ____________ surfaces
impermeable
permeable
More impermeable surfaces lead to...
less water infiltrating into the ground
more water infiltrating into the ground
an increase in the speed and amount of runoff
a decrease in the speed and amount of runoff
More impermeable surfaces lead to..
an increase in river discharge
a decrease in river discharge
an increase in the speed and amount of runoff
a decrease in the speed and amount of runoff
Deforestation DECREASES the amount of...
infiltration
surface runoff
flooding
interception
Deforestation to make way for farmland leads to..
an increase in river discharge
a decrease in river discharge
an increase in the speed and amount of runoff
a decrease in the speed and amount of runoff
Physical causes of river flooding
A lot of rainfall over a short period of time prevents...
surface runoff
infiltration
flooding
Physical causes of river flooding
Rocks like ___________ are impermeable, so water is unable to percolate from the thin soil above
limestone
chalk
granite
sandstone
Physical causes of flooding
The following physical factors INCREASE the risk of flooding
Urbanisation
Snow melt in spring
Steep sided valleys
Permeable rocks
The volume of water flowing in a river at a certain point, measured in cubic metres per second (cumecs)
Velocity
Cross-sectional area
Hydraulic radius
Discharge
How is the discharge at a point in a river calculated?
(Discharge is measured in cubic metres per second)
Average velocity (m/s) x width (m)
Cross-sectional area (m2) x average velocity (m/s)
Average depth (m) x average velocity (m/s)
