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Layer: IFR."DB-IFR".scdrs_ogl_glhd_lulc (ID: 2)

Name: IFR."DB-IFR".scdrs_ogl_glhd_lulc

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Geometry Type: esriGeometryPolygon

Description: The Great Lakes Hydrography Dataset Version 1 (GLHDv1.0), 2014, contains a consistent, binational, basin-wide watershed and interfluve layer and several related reference layers. The watershed and interfluve layer was specifically created to be incorporated into the Great Lakes Aquatic Habitat Framework (GLAHF) Great Lakes aquatic habitat classification and nearshore fish habitat assessment to summarize landscape variables consistently across the basin. The dataset was also intended to be used for a wide range of applications in the region, including nutrient modeling, data summaries, and hydrology. The GLHDv1.0 (2014) was created as a part of the GLAHF project, a geospatial database and framework for the aquatic environment of the Great Lakes. This data package contains a consistent, basin-wide watershed and interfluve layer and supporting datasets, including modified vector layers from official hydrology base datasets, and intermediate reference layers created during delineation of the watersheds and interfluves. Several base hydrology sources were utilized, including the National Hydrography Dataset Plus Version 2 (NHD+v2), the Ontario Integrated Hydrology Data Version 1.0 (OIHDv1.0), the 1:24,000 National Hydrography Dataset (NHD), and the 30m x 30m National Elevation Dataset (NED). An ArcHydro process flow was used that began with modified flow direction grids from base datasets and delineated a synthetic drainage network, associated reach-catchments, sub watersheds, and basin-wide, consistent tributary catchments boundaries. Coastal interfluves, the area between the delineated aggregated reach catchments and the shoreline (Gilliam et al. 1997), were also delineated basin-wide in a secondary processing step. Watersheds and interfluves were developed following the stream interfluves delineation methods outlined in Hollenhorst et al. (2007) using ArcHydro processing guidance from Merwade (2010). The final watersheds and interfluves layers and pour point layers, all synthetic reference layers, and modified official hydrology layers were packaged by entire Great Lakes Basin and by each Great Lake basin. Connecting channels are included with the downstream lake. A few pre-processing steps were performed to prepare the base flow direction grids for delienation: 1) the Great Lakes shoreline was enforced into the OIHDv1.0 flow direction grids; 2) EPA identified bays were used to enforce additional embayments into the shoreline to create a more detailed shoreline; 3) connecting channels were enforced at the shoreline for the NHD+v2 grids, and 4) the original hydrology datasets were modified to reflect these changes in the shoreline. Please see the Read Me document included in this data package for more details on methods and background.This layer contains the final, post processed mainland watershed boundaries along with the interfluves that were added in a secondary processing step outside of ArcHydro. A copy was made of the Watershed Original layer, interfluves were added, and some watershed and interfluve polygons were then edited based upon specified criteria. Attributes from the nearest downstream reach from the OIHDv1.0, NHD+v2 or NHD (and names from the National Hydro Network (NHN) and the Geographic Extent Layer (GEL) for Canadian watershds) were attributed to each watershed point, as long as the reach was within 200 meters. This data was then attributed to watershed polygon that corresponded to every point. Since attributes were added from the hydrology source used to delineate data for that watershed, each watershed or watershed point is linked to only the NHD+v2, OIHDv1, or NHD; therefore no watershed polygon or point will have attributes for all fields associated from the original hydrology. Please see the Attribute Description document included with the data package and the Fields section of this metadata record for more details.This dataset was altered to limit its extent to the St. Clair Detroit River System (SCDRS) Initiative Project Area (https://scdrs.org/), which includes the waters of SCDRS as defined by the SCDRS Initiative Project and their contributing watersheds. The SCDRS Initiative defines the waters of SCDRS the area approximately from the southern base of Lake Huron to the western basin of Lake Erie. This dataset was joined to the "Supporting Information" table from the GLHD publication that contained summaries for landcover percent by watershed, population density (#/km2) by watershed, and road density (km/k,m2) by watershed. For more details, see original publication: Forsyth, D, CM Riseng, KE Wehrly, LA Mason, J Gaiot, T Hollenhorst, CM Johnston, C Wyrzykowski, G Annis, C Castiglione, K Todd, M Robertson, DM Infante, L Wang, JE McKenna, G Whelan (2016) The Great Lakes Hydrography Dataset: consistent, binational watershedsfor the Laurentian Great Lakes Basin. Journal of the American Water Resources Association, doi: 10.1111/1752-1688.12435. http://onlinelibrary.wiley.com/doi/10.1111/1752-1688.12435/abstract.

Service Item Id: f1205835b1f64379913526fec3fe700b

Copyright Text: 1) The National Hydrography Dataset Plus Version 2 (1:100,000), 2012; 2) Ontario Integrated Hydrology Data Version 1, 2012; 3) The National Elevation Dataset; 4) The National Hydrography Dataset (1:24,000); 5) Hollenhorst, T.P., Brown, T.N., Johnson, L.B., Ciborowski, J.H. and Host, G.E. 2007. Methods for generating multi-scale watershed delineations for indicator development in Great Lakes coastal ecosystems. Journal of Great Lakes Research 33 (Special Issue 3:13-26, 6) Merwade, Venkatesh. 2010. Watershed and Stream Network Delineation using ArcHydro Tools. ,: and, 7) Gilliam, J.W., Osmond, D.L., and Evans, R.O. 1997. Selected agricultural best management practices to control nitrogen in the Neuse River basin. North Carolina Agricultural Research Service technical bulletin 311, North Carolina State University, Raleigh, North Carolina. 8) Forsyth, D, CM Riseng, KE Wehrly, LA Mason, J Gaiot, T Hollenhorst, CM Johnston, C Wyrzykowski, G Annis, C Castiglione, K Todd, M Robertson, DM Infante, L Wang, JE McKenna, G Whelan (2016) The Great Lakes Hydrography Dataset: consistent, binational watershedsfor the Laurentian Great Lakes Basin. Journal of the American Water Resources Association, doi: 10.1111/1752-1688.12435. http://onlinelibrary.wiley.com/doi/10.1111/1752-1688.12435/abstract. 9)The Great Lakes Aquatic Habitat Framework (GLAHF) project has been funded by the Great Lakes Fishery Trust and lead by the University of Michigan School of Natural Resources and Environment, with partners from Michigan Department of Natural Resources-Institute for Fisheries Research, NOAA Great Lakes Environmental Research Laboratory, International Joint Commission, Michigan State University, The Nature Conservancy, Ontario Ministry of Natural Resources, University of Minnesota-Duluth, U.S. Fish & Wildlife Service, U.S. Geological Survey and many collaborating partners in both the USA and Canada. More information about this project can be found at https://www.glahf.org/. 10)This SCDRS work was done as part of a Great Lakes Restoration Initiative (GLRI) grant awarded to the Office of the Great Lakes (OGL) that provided capacity funding to the Great Lakes Aquatic Habitat Framework (GLAHF) project to provide and support the platform and spatial infrastructure for planning and implementing the SCDRS Initiative softening shoreline and coastal wetland habitat restoration projects.

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