4. Calculating hydrometeorological warnings
4.1 General
Warning systems are essentially based on the estimation and forecasting tools described in the previous sections. These warnings can be issued either on the basis of flows, or directly on the basis of precipitation. Both approaches have their advantages and disadvantages. Alerts based on precipitation information alone can be calculated quickly and easily, but they do not directly represent the flow responsible for flooding. Alerts based on flow estimates represent the variable of interest, but the hydrological model on which these simulations are based represents a non-negligible source of error (§ 4.4.2
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Calculating hydrometeorological warnings
Examples of operational warning systems
Bibliography
Software tools
GRASS, a free Geographic Information System with numerous hydrological tools http://grass.fbk.eu/
Websites
VIGICRUES National flood watch information http://www.vigicrues.gouv.fr/
FFG Flash Flood Guidance maps issued by the US National Weather Service http://www.srh.noaa.gov/rfcshare/ffg.php
OHMCV Observatoire hydrométéorologique...
Events
Plinius, annual conference dedicated to Mediterranean thunderstorms http://www.egu.eu/meetings/conference-series/plinius-topical-conferences.html
Floodrisk, a conference dedicated to flood risk management http://www.floodrisk2012.net/
...Regulations
Directive 2007/60/EC of October 23, 2007 on the assessment and management of flood risks
Law no. 2003-699 of July 30, 2003 on the prevention of technological and natural risks and the repair of damage (consolidated version at April 30, 2010).
Environment Code Legislative Part
– L 562-1 to 9: PPR plans
– L 563-3: flood markers...
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