20 - GEOL 0820 Ramsey Natural Disasters Spring, 2011...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Ramsey Natural Disasters Spring, 2011 Date: 7 April 2011 I. Flooding Hazards: What is a flood? o damaging floods result when the volume of river flow exceeds levels of flood preparedness ± because flow is greater or longer than expected ± because of incomplete understanding of local hazards o natural causes: ± heavy rain ± dam failure ± rapid snowmelt ± deforestation ± steep slopes ± storm surges during tropical storms flooding can have different effects on different parts of a stream/river: o upstream: rapid rise and fall of water level o downstream: slower rise and fall, but larger area affected Important hazard to understand: o most chronic and costly natural hazard in the United States o causing an average of 140 fatalities per year o and $5 billion damage per year o United States flood plains: ± ~ 3,800 towns and cities of more than 2,500 inhabitants Top 10 U.S. Flood Disasters (1990-2001) * 2001 T.S. Allison $1.0 billion 1995 Louisiana Flood $584 million 1999 Hurricane Floyd $436 million 1992 Nor’easter $342 million 1995 Hurricane Opal $398 million 1993 Midwest Floods $271 million 1994 Texas Floods $216 million 1996 Hurricane Fran $213 million 1993 March Storm $210 million 1996 Northeast Flood $175 million * losses paid out by FEMA insurance only Flooding Damage Costs (1990-2000) year actual adjusted cost* 1990 $1.636 $2.121 1991 $1.699 $2.155 1992 $0.763 $0.935 1993 $16.370 $19.452 1994 $1.120 $1.292 1995 $5.111
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 5

20 - GEOL 0820 Ramsey Natural Disasters Spring, 2011...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online