[UW-GIS-L] towards a critical areas coverage: hydrography, hazardous slopes by WA state?

[Steven Rentmeester]

WA DNR maintains a landslide inventory for the state, a slope stability 
layer, and the state 1:24k hydrography layer.

http://www3.wadnr.gov/dnrapp6/dataweb/dmmatrix.html

Steve Rentmeester



Steve Hyde wrote:
> Looking for advise and data. Thanks in advance...
>  
> *What are we doing?:*
> We are conducting an economic impacts forecast for Initiative 933 (the 
> Property Fairness Initiative) that will be on the November ballot. We 
> want to better understand the potential fiscal impacts on State, 
> County and local governments.  We are using GIS to better understand 
> the geography of "critical areas" on private lands in Washington State 
> so that we can estimate how much money I933 will cost State taxpayers.
>  
> *What have we done?:*
> We have conducted a land cover analysis that has produced estimates 
> of acreages of private and non-private ownership for forested and and 
> agricultural lands by county. (both inside and outside urban growth 
> boundaries)
>  
> *What we need to do?*
> We need to overlay "Critical Areas" as specified by each county 
> "critical area ordinance" so that we can better understand the 
> geography of private lands that are regulated under the critical areas 
> ordinance.  It is our understanding that a "critical areas" coverage 
> does not exist for Washington State so we are planning to build one by 
> combining the hydrography data referenced below into a comprehensive 
> coverage of the State - then clip the stream networks and wetlands by 
> county so that we can apply the buffer distances for each county 
> ordinance.  In addition to hydrography we plan to create a hazardous 
> slopes coverage by calculating steep slopes from the WA State DEM. 
> (Critical Areas are primarily composed of hazardous slopes and 
> hydrography buffers)
>  
> *NOTE:*  (we have been in contact with County GIS organizations and 
> some have shared critical areas data and others want $$$)
>  
> *Does anyone have a comprehensive coverage of hydrography for 
> Washington State?*  The best data we have found is from:
> http://hydro.reo.gov/data.html    The problem is the data is not 
> aggregated by State or County.  We are planning to create a 
> comprehensive coverage from these files.  If someone has already done 
> this and willing to share the data, please let us know.
>  
> *Does anyone have a hazardous slopes coverage for Washington State?*
> ** 
> Again, thanks in advance for any suggestions anyone might have.
>  
> Thanks.
>  
> Steve
> -- 
> Stephen Hyde
> Graduate Student, GIS Instructor UWOE
> Department of Geography  |  UW, Seattle
> Box 353550  |  Office Smith Hall 417
> phone: 206.724.7929
> ------------------------------------------------------------------------
>
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