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Stormwater Planning Data Inventory

Local and regional analysis of flooding issues relies upon regularly-updated geospatial information about a variety of indicators – including land cover/use characteristics, topography, and soils. The Stormwater Planning Data Inventory, a list of useful datasets, is shown below. Some of these datasets are used in the Stormwater Management Opportunity Planning: Spatial Analysis Methodology. Each record includes the most recently available vintage and provides a link to download or request the data. 

Source Data Download / Request Vintage Description
EPA National Hydrography Dataset "Plus" 2012 Hydrologic data framework which incorporates the National Hydrography Dataset, the National Elevation Dataset, and the National Watershed Boundary Dataset.  Includes HUC12 boundaries.

Counties

Streams and Water Bodies

Download/Request:  CookDuPageKane,  KendallLake,  McHenryWill

Various Hydrographic lines and polygons created and/or hosted by County GIS departments.
ISGS; Counties Light Detection and Ranging (LiDAR) Digital Elevation Model (DEM) data Various High-resolution LiDAR-derived elevation grids.
Counties; Municipalities

Building Footprints

Download/Request:  ChicagoDuPage,  LakeWill

Various Overhead extent of building footprint as extracted or digitized from aerial photos.  Footprints are known to exist for those areas with download/request links.  For other areas, contact counties or municipalites to determine availability.
CMAP ArcHydro Modeling Outputs 2017 Includes hydrologically-corrected DEM, flow direction, flow accumulation, drainage lines, catchments, and depressions.  See data packages for additional information.
CMAP Land Use Inventory 2013 Comprehensive parcel-based Land Use Inventory, containing 59 different use classes for over 2.5 million parcels.
USGS National Land Cover Database 2011 Medium-resolution land cover grid, including percent imperviousness and percent tree canopy.
FEMA National Flood Hazard Layer (NFHL) Various Database that includes location/extent of FEMA 100 and 500 year floodplains, including Base Flood Elevation lines.
NRCS Gridded Soil Survey Data (SSURGO) 2015 Gridded version of Soil Survey Geographic (SSURGO) Database.  Includes 57 pre-summarized attributes such as potential wetland soil landscapes.
MWRD Combined Sewer Area Boundary Various Regulatory limits of unseparated sewer system, which conveys both wastewater and stormwater in the same pipes.  Contact munipalities for availability outside of MWRD's jurisdiction.
USGS Historic Topographic Maps 1889-1949 Historic maps, including the location of streams and water bodies, created via field surveys or aerophotogrammetry.
FEMA National Flood Insurance Program (NFIP) Locations, Claims, and Losses 1979-present Addresses where claims have been filed, along with date of loss and FEMA payment amount (if applicable).  Address-level flood insurance data is protected under the Privacy Act, and may be difficult to for private sector and NGOs to obtain.
USGS Historic Land Cover 1972-1978 Medium-resolution land use/cover grid, derived from USGS assessments of NASA high-altitude aerial photographs.
 

 

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