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Sunday September 07, 2008 |
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 Week No.37 Fact No.36 |
Some causes of Flooding
Problems and damages that occur during a
flood are often as a result of human
development and actions. Flood problems
may occur due to:
a) Inappropriate development in the
floodplain (e.g., building too low, too
close to the channel, or blocking flood
flows);
b) Development in the watershed that
increases flood flows and creates a
larger floodplain;
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Posted by Joan Mc Donald |
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Sunday September 07, 2008 |
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Week No.37 Fact No.35 |
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What is a Major Hurricane?
A hurricane which reaches Category 3 (sustained winds
greater than 110 mph) on the Saffir/Simpson Hurricane
Scale.
The Saffir/Simpson Hurricane scale was developed in an
effort to estimate the possible damage a hurricane's
sustained winds and storm surge could do to a coastal
area. The scale of numbers are based on actual
conditions at some time during the life of the storm. As
the hurricane intensifies or weakens, the scale number
is reassessed accordingly. The following table shows the
scale broken down by central pressure, winds, and storm
surge.
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Category |
Central Pressure (mb) |
Wind Speed (mph) |
Storm Surge (ft.) |
Damage |
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1 |
980 or > |
74 - 95 |
4 - 5 |
Minimal |
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2 |
965 - 979 |
96 - 110 |
6 - 8 |
Moderate |
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3 |
945 - 964 |
111 - 130 |
9 - 12 |
Extensive |
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4 |
920 - 944 |
131 - 155 |
13 - 18 |
Extreme |
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5 |
< 920 |
> 155 |
> 18 |
Catastrophic |
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Posted by Joan Mc Donald |
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