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Unformatted text preview: GEOL 0820 Ramsey Natural Disasters Spring, 2011 LECTURE #21: Flood Monitoring/Mitigation Date: 12 April 2011 I. Monitoring • stream gages o talked about this last week when we looked at hydrographs in lecture and the recitation o system of devices on most large creeks, streams, rivers o operated by the USGS o example: current conditions at the Red River, ND (below) o relatively simple design ¡ not in the river channel but connected to it through several inlet pipes ¡ pipes empty into a well where the water level is the same as the river level at the time ¡ water level is monitored by a float ¡ data are recorded on a local storage device (hard drive) ¡ data also transmitted real time using either short-wave or cell phone networks • use of satellite imagery • example: 1993 Midwest Floods o greatest in recorded history o displacement of jet stream o 150% of normal rainfall over large area of US ¡ heaviest in headwater regions of Missouri and Mississippi Rivers ¡ coupled with lack of typical mid-winter thaw Page 1/5 o...
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This note was uploaded on 01/05/2012 for the course GEOL 0820 taught by Professor Ramsay during the Spring '08 term at Pittsburgh.
- Spring '08