Description: This data set is a complete digital hydrologic unit boundary layer to the Subwatershed (12-digit) 6th level for the State of Iowa. This data set consists of geo-referenced digital data and associated attributes created in accordance with the "FGDC Proposal, Version 1.0 - Federal Standards For Delineation of Hydrologic Unit Boundaries 3/01/02"(http://www.ftw.nrcs.usda.gov/huc_data.html). Polygons are attributed with hydrologic unit codes for 4th level sub-basins, 5th level watersheds, 6th level subwatersheds, name, size, downstream hydrologic unit, type of watershed, non-contributing areas and flow modification. Arcs are attributed with the highest hydrologic unit code for each watershed, linesource and a metadata reference file. Full Metadata: ftp://ftp.igsb.uiowa.edu/gis_library/ia_state/watersheds/watershed_boundary_dataset/WBD_HU_12.html
Description: This data set is a complete digital hydrologic unit boundary layer to the Subwatershed (12-digit) 6th level for the State of Iowa. This data set consists of geo-referenced digital data and associated attributes created in accordance with the "FGDC Proposal, Version 1.0 - Federal Standards For Delineation of Hydrologic Unit Boundaries 3/01/02"(http://www.ftw.nrcs.usda.gov/huc_data.html). Polygons are attributed with hydrologic unit codes for 4th level sub-basins, 5th level watersheds, 6th level subwatersheds, name, size, downstream hydrologic unit, type of watershed, non-contributing areas and flow modification. Arcs are attributed with the highest hydrologic unit code for each watershed, linesource and a metadata reference file. Full Metadata: Mftp://ftp.igsb.uiowa.edu/gis_library/ia_state/watersheds/watershed_boundary_dataset/WBD_HU_10.html
Description: This data set is a complete digital hydrologic unit boundary layer to the Subwatershed (12-digit) 6th level for the State of Iowa. This data set consists of geo-referenced digital data and associated attributes created in accordance with the "FGDC Proposal, Version 1.0 - Federal Standards For Delineation of Hydrologic Unit Boundaries 3/01/02"(http://www.ftw.nrcs.usda.gov/huc_data.html). Polygons are attributed with hydrologic unit codes for 4th level sub-basins, 5th level watersheds, 6th level subwatersheds, name, size, downstream hydrologic unit, type of watershed, non-contributing areas and flow modification. Arcs are attributed with the highest hydrologic unit code for each watershed, linesource and a metadata reference file. Full Metadata: ftp://ftp.igsb.uiowa.edu/gis_library/ia_state/watersheds/watershed_boundary_dataset/WBD_HU_10.html
Description: This data set represents the watershed boundaries of Iowa's rivers and streams. This data set was derived from the Watershed Boundary Dataset, 8, 10 and 12-Digit Hydrologic Units. All relavant units were dissolved into one unit. Full Metadata: ftp://ftp.igsb.uiowa.edu/gis_library/ia_state/watersheds/stream_watersheds/stream_watersheds.html
Description: Public_lakes_watersheds are the delineated drainage areas to Iowa public lakes. The layer was created using the contour lines from geo-referenced topoquad maps and the HUC 12-digit boundaries. Full Metadata: ftp://ftp.igsb.uiowa.edu/gis_library/ia_state/watersheds/public_lakes_watersheds/SPOL_watersheds.html
Description: This layer represents watershed boundaries for all approved Total Maximum Daily Load (TMDL) in Iowa. A TMDL, also called a Watershed Improvement Plan, identifies water quality problems, possible causes of those problems and proposes solutions. Full Metadata: ftp://ftp.igsb.uiowa.edu/gis_library/ia_state/watersheds/TMDL_watersheds/TMDL_watersheds.html