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Old 03-30-2014, 12:07 PM
 
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Look around you. Is there a hill nearby with a slope steeper than 15%? Has it been recently logged, or does it have a healthy forest covering it? Or is it covered in houses and cement? If it is a relatively bare slope without paving or trees, you might be at risk. The steeper the slope, the more likely.

Remember that most of the hills around here are just piles of glacial till, not solid rock. They erode. Erosion = slides. The steeper the slope, the more gravity wants to make it flatter.
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Old 03-30-2014, 02:01 PM
 
Location: East of Seattle since 1992, 615' Elevation, Zone 8b - originally from SF Bay Area
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Quote:
Originally Posted by sean98125 View Post
Look around you. Is there a hill nearby with a slope steeper than 15%? Has it been recently logged, or does it have a healthy forest covering it? Or is it covered in houses and cement? If it is a relatively bare slope without paving or trees, you might be at risk. The steeper the slope, the more likely.

Remember that most of the hills around here are just piles of glacial till, not solid rock. They erode. Erosion = slides. The steeper the slope, the more gravity wants to make it flatter.
Almost all of these newer houses and townhomes in the hills of the plateau are the result of clear cuts. When we first moved here the Issaquah Highlands and the area above Home Depot were all woods. Look at where the huge development of another 400 multi-family homes is being built in the highlands across from the transit center, and you will see not only cutting into the hill but also filling/compacting of the valley/wet areas. Modern geological engineering is probably better than what didn't exist or was not required for those
homes in Oso, but no one can truly predict mother nature.
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Old 05-05-2014, 10:15 AM
 
Location: Eastside, WA
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I found this handy website this morning (thanks KPLU)

"Seattle’s city council is hosting a briefing on landslide hazards. It turns out the city has extensive maps to help landowners and developers mitigate the risks. All you have to do is go to the city's website and type in your address."

Department of Planning & Development - DPD GIS
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