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Colm Moore · 13-02-2008, 23:04

Pardon me, but flooding comes and goes.

I saw some graphs of flood patterns in the Tolka valley (affects Clonsilla-Dunboyne) and the flooding return periods worked almost like clockwork, random clockwork, but if a place flooded 5 times in the last 20 years if will flood 5 times in the next 20 years also. Of course, more serious flooding is estimated at 50 and 100 year periods.

I don't know about the particular location, but some some of the problems include surface run-off from road and urban areas and encroachment on and obstruction of traditional flood plains. The most infamous example of this is the Mississippi where the river is now 100 miles shorter than it used to be and levees box in the floods. All that water has to go somewhere. And when it goes over the levee, its heartbreak or worse.

13-02-2008, 23:04	#7
Colm Moore Local Liaison Officer Join Date: Dec 2006 Posts: 5,442	Pardon me, but flooding comes and goes. I saw some graphs of flood patterns in the Tolka valley (affects Clonsilla-Dunboyne) and the flooding return periods worked almost like clockwork, random clockwork, but if a place flooded 5 times in the last 20 years if will flood 5 times in the next 20 years also. Of course, more serious flooding is estimated at 50 and 100 year periods. I don't know about the particular location, but some some of the problems include surface run-off from road and urban areas and encroachment on and obstruction of traditional flood plains. The most infamous example of this is the Mississippi where the river is now 100 miles shorter than it used to be and levees box in the floods. All that water has to go somewhere. And when it goes over the levee, its heartbreak or worse.