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This dataset shows WDFW’s current modeled approximation of riparian management zones (RMZs) that are the width of a site-potential tree height of a 200-year-old tree (SPTH200) within the forested ecoregion. This regional dataset was developed for analytical purposes and can be used to estimate the total area, distribution, or patterns of RMZs at a landscape scale (for example, county or watershed). |
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This dataset shows WDFW’s current modeled approximation of riparian management zones (RMZs) that are the width of a site-potential tree height of a 200-year-old tree (SPTH200) within the forested ecoregion. This regional dataset was developed for analytical purposes and can be used to estimate the total area, distribution, or patterns of RMZs at a landscape scale (for example, county or watershed). |
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Washington Department of Fish and Wildlife |
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5000 |
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[] |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The RMZ is measured from the wider of the centerline (when the stream is represented by a line), stream edge (when the stream is represented by a polygon), or outside edge of an observed migration zone (OMZ). The OMZ was created specifically for this effort to map RMZs by combining existing data sources showing mapped stream locations which included (a) the National Hydrography Dataset (NHD) area polygons, (b) NHD waterbody polygons (e.g., lakes, ponds, sloughs, deltas) which intersect streams, (c) WDFW 2017 Visible Surface Water area polygons, and (d) areas marked as river in the NRCS soils data used to develop SPTH200. The OMZ is not a substitute for the channel migration zone (CMZ); rather, because no statewide dataset for CMZs currently exists, we created OMZs using existing data to enable the mapping of RMZs, knowing that in many instances the OMZ will be narrower than the CMZ. The dataset is subject to change as better base data becomes available. Caution: These data are a modeled representation of RMZs developed using GIS data and remote sensing datasets. As such they are estimates of RMZ locations and not surveys of known RMZ locations. This regional dataset was developed for analytical purposes and can be used to estimate the total area, distribution, or patterns of RMZs at a landscape scale (for example, county or watershed). This dataset is not intended to support site-scale land use decisions – other than for use as a flagging tool to determine where site surveys are necessary. True delineation of RMZ boundaries for any sitescale land use decisions require a field survey to verify a RMZ’s presence, boundary, and quality. </SPAN></P></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Any products derived from these data should reference Washington Department of Fish and Wildlife as the source.</SPAN></P><P><SPAN>Please contact us if you want to distribute the dataset. </SPAN></P><P><SPAN>WDFW makes no guarantee or warranty concerning the accuracy of these data. WDFW further makes no warranties, either expressed or implied as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. </SPAN></P><P><SPAN>We are aware of the following potential sources of error in dataset: </SPAN></P><P><SPAN>• Errors exist in the underlying NHD linework; these will be propagated into the RMZ polygons.</SPAN></P><P><SPAN>• The OMZ is not a reliable inner edge of the RMZ; a field survey is needed to determine the Ordinary High Water Mark or CMZ as the inner edge of the RMZ. </SPAN></P><P><SPAN>• SPTH200 distances are calculated based on statewide soil and tree species data. A site survey may identify different soil and tree species conditions resulting in a different SPTH200 value. Where soil data was unavailable (often on federal and tribal lands) the RMZ width was set to 100 feet. </SPAN></P></DIV></DIV></DIV> |
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| title:
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Riparian Management Zone tessellations - (WDFW) |
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| tags:
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["Washington State","Riparian","Site Potential Tree Height","SPTH","Habitat","Protection","WDFW","Washington Department of Fish and Wildlife","Puget Sound","Pacific Northwest","WRIA","Water Resource Inventory Area","Fish habitat"] |
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en-US |
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150000000 |
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