General Information

Project area general description

The state of Delaware

Are any areas excluded?

none

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?

Yes

DEM and derivatives projection (general description)

Delaware State Plane

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

10 m

DEM source

The National Elevation Dataset (NED): http://ned.usgs.gov/ (circa 2006)

Hydrography source

The National Hydrography Dataset (NHD): http://nhd.usgs.gov/ (circa 2006)

Hydrologic unit "walls" source

WBD and MD/WSC Digitized gage boundaries

Gage basin boundaries source

MD/DE WSC Digitiized

Interactive map snapping tolerance

3 cells

 

Basin Characteristics Methods and Sources

Name

Description

Computation method

Data source

Report

Variable label in report

BSLDEM10M

Mean basin slope measured in percent (10-meter NED)

area-weighted mean

10-meter NED (http://ned.usgs.gov/) circa 2006

Ries and Dillow (2006)

BSLDEM10M

DRNAREA

Drainage area in square miles

polygon area

GlobalWatershed

Ries and Dillow (2006)

DRNAREA

FOREST

Percentage of area covered by forest.

percent of area

Delaware Landcover 2002 (http://stateplanning.delaware.gov/info/lulcdata/2002_lulc.shtml).  Anderson Classification categories 410, 420, 430.  NLCD 2001 outside the State

Ries and Dillow (2006)

FOREST

IMPNLCD01

Percentage of area covered by impervious surfaces, from NLCD 2001

area-weighted mean

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

Ries and Dillow (2006)

IMPNLCD01

SOILA

Hydrologic Soil Type A in percent - determined from STATSGO data, in inches per inch 

percent of area

http://www.soils.usda.gov/survey/geography/statsgo/

Ries and Dillow (2006)

SOILA

STORNHD

Wetlands and Waterbody storage in percent

percent of area

The National Hydrography Dataset http://nhd.usgs.gov/ (circa 2006)

Ries and Dillow (2006)

STORNHD

LC11IMP

Percentage of impervious area determined from NLCD 2011 impervious dataset

area-weighted mean

NLCD 2011 imperviousness grid http://www.mrlc.gov/nlcd01_data.php

 

 

LC11DEV

Percentage of urban land cover determined from NLCD 2011 land cover dataset

percent of area

NLCD 2011, codes 21-24 http://www.mrlc.gov/nlcd01_data.php

 

 

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