General Information

Project area general description

State of Ohio

Are any areas excluded?

Ohio River

Types of flow statistics available

Statewide low flows, monthly and annual mean flows, highflows, and selected flow quantiles

ArcGIS version used for processing

Originally 9.1, with some updates using 9.2 and 9.3

Was TopoGrid used to process DEMs?

Yes

DEM and derivatives projection (general description)

UTM zone 17, NAD83

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

10 m

DEM source

Developed from 1:24,000 DLG hypsography and resampled 30-m NED for southern Michigan

Hydrography source

medium resolution (1:100K scale) NHD

Hydrologic unit "walls" source

legacy 14-digit HUCs (http://www.nrcs.usda.gov/wps/portal/nrcs/detail/oh/technical/?cid=nrcs144p2_029638)

Gage basin boundaries source

based on 14-digit HUC boundaries

Interactive map snapping tolerance

6 cells

 

Basin Characteristics Methods and Sources

Name

Description

Computation method

Data source

Report

Variable label in report

CSL1085LFP

10-85 slope of main channel, in feet per mile

ArcHydro Tools LFPathOp

custom DEM developed from 1:24,000 DLG hypsography and resampled 30-m NED fo rsouthern Michigan

Koltun and others (2006)

SL10-85

D80PA

Streamflow per unit of drainage area exceeded 80 percent of the time (D80PA)

grid value at location

grid developed by IDW interpolation of published low-flow frequencies divided by drainage area (from WRIR 01-41040)

Koltun and Kula (2013)

D80m

DRNAREA

Area in square miles

polygon area

GlobalWatershed

Koltun and Whitehead (2002), Koltun and others (2006)

A or DA

FOREST

Area Covered by forest, in percent

percent of area

Estimated using ArcInfo Grid with 30-meter resolution data layers from the USGS National Land Cover Dataset (1992); forest categories included: deciduous, evergreen, and mixed. Source: http://edcwww.cr.usgs.gov/pub/data/land-cover/states/ohio_NLCD_flat_031600_final.bin.gz

Koltun and Whitehead (2002)

F

LAT_CENT

Y coordinate (latitude) of the centroid, in decimal degrees

Centroidlabels

GlobalWatershed

Koltun and Whitehead (2002)

Latc

LONG_CENT

X coordinate (longitude) of the centroid, in decimal degrees

Centroidlabels

GlobalWatershed

Koltun and Whitehead (2002)

Longc

M1D10YPA

1-Day mean low-flow per unit of drainage area that occurs on average once in 10 years, cfs/mi2

grid value at location

grid developed by IDW interpolation of published low-flow frequencies divided by drainage area (from WRIR 01-41040)

Koltun and Kula (2013)

Q1,10m

M30D10YPA

30-Day mean low-flow per unit of drainage area tha occurs on average once in 10 years, cfs/mi2

grid value at location

grid developed by IDW interpolation of published low-flow frequencies divided by drainage area (from WRIR 01-41040)

Koltun and Kula (2013)

Q30,10m

M7D10YPA

7-Day mean low-flow per unit of drainage area tha occurs on average once in 10 years, cfs/mi2

grid value at location

grid developed by IDW interpolation of published low-flow frequencies divided by drainage area (from WRIR 01-41040)

Koltun and Kula (2013)

Q7,10m

M90D10YPA

90-Day mean low-flow per unit of drainage area that occurs on average once in 10 years, in cfs/mi2

grid value at location

grid developed by IDW interpolation of published low-flow frequencies divided by drainage area (from WRIR 01-41040)

Koltun and Kula (2013)

Q90,10m

OHREGA

Region A indicator for Ohio Peak Flows

grid value at location

http://water.usgs.gov/lookup/getspatial?floodregions

Koltun (2003)

RC

OHREGC

Region C indicator for Ohio Peak Flows

grid value at location

http://water.usgs.gov/lookup/getspatial?floodregions

Koltun (2003)

RC

PRECIP

Mean annual precipitation at basin centroid, in inches

grid value at centroid

http://water.usgs.gov/lookup/getspatial?raintin

Koltun and Whitehead (2002)

Pc

LC92STOR

Area Covered by water and wetlands, in percent

percent of area

Estimated using ArcInfo Grid with 30-meter resolution data layers from the USGS National Land Cover Dataset (1992); categories included: open water and wood and emergent herbaceous wetlands. Source: http://edcwww.cr.usgs.gov/pub/data/land-cover/states/ohio_NLCD_flat_031600_final.bin.gz

Koltun and Whitehead (2002)

W

STREAM_VARG

Streamflow variability index at the outlet

grid value at location

Custom grid developed from IDW interpolation of streamflow variability indicies determined from gage data

Koltun and Kula (2013)

SVI

LC11IMP

Precentage of area covered by impervious surfaces, from NLCD 2011

area-weighted mean

NLCD 2011 imperviousness grid http://www.mrlc.gov/nlcd11_data.pphp

 

 

LC11DEV

Precentage of area covered by Urban land use, from NLCD 2011

percent of area

NLCD 2011, codes 21-24 http://www.mrlc.gov/nlcd11_data.shp

 

 

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