Flooding, and the effect of humans

1
Flooding, and the effect of humans
CW
21st September 2005

• Lesson Aims
• To know the causes of flooding
• To understand the causes of flooding, including
  mans effects

2
Recap

• Last lesson- we identified the different parts of
  the River Drainage Basin-

3
Recap

• Last lesson- we identified the different parts of
  the River Drainage Basin-

• We also saw how vegetation, basin shape, basin
  size, and basin density affects the discharge of
  the river

4
Your homework was

• to find out why New Orleans floods regularly
  (not because of hurricanes)
• I told you to research the Mississippi Drainage
  basin
• If you did, you Shouldve found the following

5
As you can see, the Mississippi Drainage basin
drains over half of USA.
The main reason that New Orleans suffers from
flooding is that it is located here
So when there are storms elsewhere in the
drainage basin, or lots of melt-water from the
mountains, sometime later on (Lag-Time) New
Orleans can expect floods
6
4 Factors why rivers may flood
Copy this

• The 4 factors that contribute towards flooding
  are-
• Type and Amount of Precipitation
• Type of soil and underlying rock
• Land use of river basin
• Human activity

7
Task

• Key Geography Textbooks
• Page 16
• Go through each one of the 4 factors (Type and
  Amount of Precipitation, Type of soil and
  underlying rock, Land use of river basin, Human
  activity)
• Make detailed notes on each one
• For Land use also copy Picture B
• For Human Activity also copy this Brainstorm

Underground pipes
8
Task

• Page 17 Activities 1 3
• Copy Summary