Ondarvr -
Sorry to hear about the erosion on your property.

According to USGS records the peak flow at Goldbar in this recent event was 62,000 cfs. Over the last decade there have been at least 4 events at least that large; peak on 1/11 reached 63,900, the one in 1/2009 reached 74,000, the one in 11/2006 reached 129,000 and the one in 1/2005 reached 74,600.

You are correct that the duration of the event can be key to the amount of damage a flood can do. According to the flow records at Goldbar flood stage is about 30,000 cfs and this weeks event was at that level or above for about 24 hours. During the 2009 event it was at or above the 30,000 level for about 35 hours.

I suspect that it speaks volumes about the sad shape the Skykomish basin is in when we can see floods the size (discharge twice the "flood threshold") or lager than this weeks event multiple times a decade.

Curt