General Information

Project area general description
The state of Wisconsin
Are any areas excluded?
The Mississippi and Wisconsin River mainstems are excluded.
Types of flow statistics available
Peak flows statewide
ArcGIS version used for processing
Originally 9.1, with some updates using 9.2 and 9.3
Was TopoGrid used to process DEMs?
No.
DEM and derivatives projection (general description)
Albers Equal Area for conterminous US; same as NHDPlus Version 1. See http://www.horizon-systems.com/NHDPlus/NHDPlusV1_documentation.php for details.
DEM and derivatives (fdr, fac, etc.) resolution
 30 m
DEM source
NHDPlus V1 (NED 2004) http://www.horizon-systems.com/NHDPlus/NHDPlusV1_data.php
Hydrography source
NHDPlus V1 (1:100,000 NHD snapshot) http://www.horizon-systems.com/NHDPlus/NHDPlusV1_data.php
Hydrologic unit "walls" source
not used
Gage basin boundaries source
not used
Interactive map snapping tolerance
3 cells


Basin Characteristics Methods and Sources

Name
Description
Computation method
Data source

Report

Variable label in report
CLIFAC100Y
Regional climate factor based on rainfall and pan evaporation, 100-year recurrence interval.
Area-weighted mean
Climate factor contour images (Lichty and Karlinger, 1990), digitized and georeferenced climate factor images.  Converted and interpolated contour lines into raster dataset with the 3D Spatial Analyst Toolbox.  Computed basin mean with Zonal statisics in ArcMap 9.3
Walker and others (2016)

not used

CLIFAC25Y
Regional climate factor based on rainfall and pan evaporation, 25-year recurrence interval.
Area-weighted mean
Climate factor contour images (Lichty and Karlinger, 1990), digitized and georeferenced climate factor images.  Converted and interpolated contour lines into raster dataset with the 3D Spatial Analyst Toolbox.  Computed basin mean with Zonal statisics in ArcMap 9.3
Walker and others (2016)

not used

CLIMFAC2YR
Regional climate factor based on rainfall and pan evaporation, 2-year recurrence interval.
Area-weighted mean
Climate factor contour images (Lichty and Karlinger, 1990, digitized and georeferenced climate factor images.  Converted and interpolated contour lines into raster dataset with the 3D Spatial Analyst Toolbox.  Computed basin mean with Zonal statisics in ArcMap 9.3)
Walker and others (2016)

not used

CSL10_85
10-85 slope of the basin.
Feet per mile
GlobalWatershed
Walker and others (2016)

S

DEVNLCD01
Percent developed from NLCD2001
Percent of basin area
NLCD 2001,  grid cells (30m x 30m) contained within the basin classified as low, medium, or high intensity urban development (land-cover classes 22, 23, 24), and dividing by the area of the basin and multiplying by 100. http://www.epa.gov/mrlc/nlcd-2001.html, accessed September 2010.
Walker and others (2016)

Dev

DRNAREA
Drainage area of basin.
Area in square miles
GlobalWatershed
Walker and others (2016)

A

FOREST
Percent area covered by forest land.
Percent of basin area
NLCD 2001,  grid cells (30m x 30m) contained within the basin classified as deciduous, evergreen, or mixed forest (land-cover classes 41, 42, 43), and dividing by the area of the basin and multiplying by 100. http://www.epa.gov/mrlc/nlcd-2001.html, accessed September 2010.
Walker and others (2016)

F

I24H100Y
1971–2000 mean annual precipitation in the basin with 24-hour precipitation indices of 100 year.
Area-weighted mean
Determined by georeferencing the precipitation contour images (Huff and Angel, 1992) for each recurrence interval to a coverage with known spatial reference and digitizing the contour lines,  using the Topo to Raster tool from the ESRI ArcMap 9.3 3D Spatial Analyst Toolbox to interpolate to a raster, and calculating the mean of each basin using zonal statistics. For small basins that were unable to be automatically calculated, values were estimated manually.
Walker and others (2016)

not used

I24H10Y
1971–2000 mean annual precipitation in the basin with 24-hour precipitation indices of 10 year.
Area-weighted mean
Determined by georeferencing the precipitation contour images (Huff and Angel, 1992) for each recurrence interval to a coverage with known spatial reference and digitizing the contour lines,  using the Topo to Raster tool from the ESRI ArcMap 9.3 3D Spatial Analyst Toolbox to interpolate to a raster, and calculating the mean of each basin using zonal statistics. For small basins that were unable to be automatically calculated, values were estimated manually.
Walker and others (2016)

not used

I24H25Y
1971–2000 mean annual precipitation in the basin with 24-hour precipitation indices of 25 year.
Area-weighted mean
Determined by georeferencing the precipitation contour images (Huff and Angel, 1992) for each recurrence interval to a coverage with known spatial reference and digitizing the contour lines,  using the Topo to Raster tool from the ESRI ArcMap 9.3 3D Spatial Analyst Toolbox to interpolate to a raster, and calculating the mean of each basin using zonal statistics. For small basins that were unable to be automatically calculated, values were estimated manually.
Walker and others (2016)

not used

I24H2Y
1971–2000 mean annual precipitation in the basin with 24-hour precipitation indices of 2 year.
Area-weighted mean
Determined by georeferencing the precipitation contour images (Huff and Angel, 1992) for each recurrence interval to a coverage with known spatial reference and digitizing the contour lines,  using the Topo to Raster tool from the ESRI ArcMap 9.3 3D Spatial Analyst Toolbox to interpolate to a raster, and calculating the mean of each basin using zonal statistics. For small basins that were unable to be automatically calculated, values were estimated manually.
Walker and others (2016)

not used

I24H50Y
1971–2000 mean annual precipitation in the basin with 24-hour precipitation indices of 50 year.
Area-weighted mean
Determined by georeferencing the precipitation contour images (Huff and Angel, 1992) for each recurrence interval to a coverage with known spatial reference and digitizing the contour lines,  using the Topo to Raster tool from the ESRI ArcMap 9.3 3D Spatial Analyst Toolbox to interpolate to a raster, and calculating the mean of each basin using zonal statistics. For small basins that were unable to be automatically calculated, values were estimated manually.
Walker and others (2016)

not used

I24H5Y
1971–2000 mean annual precipitation in the basin with 24-hour precipitation indices of 5 year.
Area-weighted mean
Determined by georeferencing the precipitation contour images (Huff and Angel, 1992) for each recurrence interval to a coverage with known spatial reference and digitizing the contour lines,  using the Topo to Raster tool from the ESRI ArcMap 9.3 3D Spatial Analyst Toolbox to interpolate to a raster, and calculating the mean of each basin using zonal statistics. For small basins that were unable to be automatically calculated, values were estimated manually.
Walker and others (2016)

not used

LC01CRPHAY
Percent area covered by Pasture or cultivated Crops from NLCD2001
Percent of basin area
NLCD 2001,  grid cells (30m x 30m) contained within the basin classified as herbaceous vegetation that has been planted or is intensively managed for the production of food, feed, or fiber; or is maintained in developed settings for specific purposes (land-cover classes 81, 82), and dividing by the area of the basin and multiplying by 100. http://www.epa.gov/mrlc/nlcd-2001.html, accessed September 2010.
Walker and others (2016)

not used

LC01HERB
Percent area covered by grassland from NLCD2001
Percent of basin area
NLCD 2001,  grid cells (30m x 30m) contained within the basin dominated by grammanoid or herbaceous vegetation (land-cover class 71) and dividing by the area of the basin and multiplying by 100. http://www.epa.gov/mrlc/nlcd-2001.html, accessed September 2010.
Walker and others (2016)

not used

LC01WATER
Percent area covered by open water.  Does not include wetlands
Percent of basin area
NLCD 2001,  grid cells (30m x 30m)  contained within the basin classified as open water (land-cover classes 11) and dividing by the area of the basin and multiplying by 100. http://www.epa.gov/mrlc/nlcd-2001.html, accessed September 2010.
Walker and others (2016)

W

LC01EMWET
Percent area covered by emergent wetlands.
Percent of basin area
NLCD 2001, grid cells (30m x 30m) contained within the basin classified as areas where perennial herbaceous vegetation accounts for greater than 80 percent of vegetative cover and the soil or substrate is periodically saturated with or covered with water (land-cover classes 95), and dividing by the area of the basin and multiplying by 100. http://www.epa.gov/mrlc/nlcd-2001.html, accessed September 2010.
Walker and others (2016)

not used

LC01WDWET
Percent area  covered by woody wetlands.
Percent of basin area
NLCD 2001, grid cells (30m x 30m) contained within the basin classified as areas where forest or shrub land vegetation accounts for greater than 20 percent of vegetative cover and the soil or substrate is periodically saturated with or covered with water (land-cover classes 90), and dividing by the area of the basin and multiplying by 100. http://www.epa.gov/mrlc/nlcd-2001.html, accessed September 2010.
Walker and others (2016)

not used

PRECIP
1971–2000 mean annual precipitation in the basin, in inches.
Area-weighted mean
Interpolating point precipitation data to a raster format  with 30m x 30m grids and using ordinary kriging with linear semivariogram (tool contained within ArcGIS 10.1). Calculating the mean of each basin using zonal statistics.
Walker and others (2016)

not used

SNOFALL
1971–2000 mean annual snowfall in the basin, in inches.
Area-weighted mean
Interpolating point snowfall data to a raster format  with 30m x 30m grids and using ordinary kriging with linear semivariogram (tool contained within ArcGIS 10.1). Calculating the mean of each basin using zonal statistics.
Walker and others (2016)

not used

SOILPERM
Mean Saturated hydraulic conductivity (Ksat) in the basin.  Ksat is the ease in which water can move through a medium (in/hr).
Area-weighted mean
Extracted Ksat data from SSURGO datasets for each county using U.S. Department of Agriculture Soil Data Viewer software (http://soils.usda.gov/sdv/) with the following rating options: Aggregation method = weighted average, Tie Break Rule = fastest, Layer Options = surface layer, merging the data into a statewide map,  creating a raster from the statewide data using a cell size of 30 m, and calculating the mean of each basin using the Zonal Statistics geoprocessing tool located within Spatial Analyst in ArcGIS 10.1. The computed value, in micrometers per second, was then converted to inches per hour.
Walker and others (2016)

Ksat

WETLAND
Percent area covered by wetlands.
Percent of basin area
NLCD 2001, grid cells (30m x 30m) contained within the basin classified as areas where forest or shrub land vegetation accounts for greater than 20 percent of vegetative cover, where perennial herbaceous vegetation accounts for greater than 80 percent of vegetative cover, and the soil or substrate is periodically saturated with or covered with water (land-cover classes 90,95), and dividing by the area of the basin and multiplying by 100. http://www.epa.gov/mrlc/nlcd-2001.html, accessed September 2010.
Walker and others (2016)

not used