General Information

Project area general description

State of Illinois

Are any areas excluded?

MS River, OH River, IL River and Wabash River excluded.

Types of flow statistics available

peak flows

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)

NAD 1927 Albers in meters

DEM and derivatives (fdr, fac, etc.) resolution

30m DEM resampled to 10m

DEM source

NED 2004

Hydrography source

Med-resolution NHD 1:100,000 scale

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     Data reference

Report

Variable label in report

BASLENAH

Adjusted basin length

Computed basin length

Computed using 1.0164*BASLENRAW+0.2364


Soong, Ishii, Sharpe & Avery (2004)

BL

BASLENRAW

Unadjusted basin length

Computed basin length

Computed using Bain Length ArcHydro tool

Soong, Ishii, Sharpe & Avery (2004)

BL

CSL10_85

Adjusted Channel 10-85 slope in feet per mile

Computed Stream Slope

Computed using 1.0767*CSL1085RAW^0.9486


Soong, Ishii, Sharpe & Avery (2004)

MCS

CSL1085RAW

Unadjusted Channel 10-85 slope in feet per mile

Computed Stream Slope

Computed using Stream Slope ArcHydro tool


Soong, Ishii, Sharpe & Avery (2004)

MCS

DRNAREA

Drainage area in square miles

Basin area

30m NED resampled to 10m, 1:100,000-scale NHD

Soong, Ishii, Sharpe & Avery (2004)

TDA

Over and others (2017)
DA
FLC11DVLMH Fraction 2011 NLCD classes  22, 23, 24 (low, medium, and high density developed)    
Fraction of basin https://www.mrlc.gov/nlcd11_data.php
Jin and others (2013)
Over and others (2017)
NLCD_22_23_24
FSSURGDC78
SSURGO fraction "very poorly drained" and "unknown
Fraction of basin
https://websoilsurvey.nrcs.usda.gov/

Over and others (2017)


DrainageClass1a
RELRELF
Relative relief in feet per mile
(Maximum basin elevation - minimum basin elevation) / basin perimeter
Computed from 30m NED resampled to 10m, 1:100,000-scale NHD

Over and others (2017)


DEM_1_0_P

SOILPERM

Average soil permeability

Basin average

Computed


Soong, Ishii, Sharpe & Avery (2004)

PERMAVE
URBTHE2010
Fraction of housing with no more than 10 acres per unit plus commercial / industrial / transportation land use
Fraction of basin


https://doi.org/10.3133/sir20165049
Theobald (2005)
Over and others (2017)


Theobald_Urban

WATWET

Percent of area covered by open water using NLCD 2001

Percent of basin

NLCD 2001 water grid http://www.mrlc.gov/nlcd01_data.php


Soong, Ishii, Sharpe & Avery (2004)

%WATER

Jin, S., Yang, L., Danielson, P., Homer, C., Fry, J., and Xian, G., 2013, A comprehensive change detection method for updating the National Land Cover Database to circa 2011: Remote Sensing of Environment, v. 132, p. 159–175.

Over, T.M., Saito, R.J., Veilleux, A.G., Sharpe, J.B., Soong, D.T., and Ishii, A.L., 2017, Estimation of peak discharge quantiles for selected annual exceedance probabilities in northeastern Illinois (ver. 2.0, November 2017): U.S. Geological Survey Scientific Investigations Report 2016–5050, 50 p. with appendix, https://doi.org/10.3133/sir20165050.

Theobald, D., 2005, Landscape patterns of exurban growth in the USA from 1980 to 2020: Ecology and Society, v. 10, no. 1, article 32, 29 p. 


The Illinois StreamStats introductory page here has additional information regarding the application, including links to reports, cooperators, and other explanatory information.