Scientist Says Storm that Caused Flooding near Calgary in June, 2013 Almost Identical to Colorado Flood Storm

The problem with traditional methods of calculating the 100 year or 500 year flood is that it only looks at past historical occurrences of rainfall at a single location. The reality is that the meteorological conditions which produce floods like last September's in Boulder happen every 5 to 15 years somewhere along the Front Range. This study shows that the same conditions develop on the east side of the Rockies all the way up to northern Canada - News link . The exact location of these extreme rainfall events in Colorado depends on unique, localized conditions developing which are impossible to forecast at a specific location.  100-year flood zones along the Front Range should be based on an event of 14" of rain in 6 hours. This will never be accepted by developers and zoning officials because when you throw in the landslide potential along creeks in the mountains from these extreme rainfall events, the cost for a lot of real estate and infrastructure development will be prohibitive.