General Information

Project area general description

The state of Maryland

Are any areas excluded?

Yes. See notes on “Low-flow frequency estimates” and “Water-use information” on the Maryland introductory page

Types of flow statistics available

Peak flows State-wide, low flows and water use in limited areas

ArcGIS version used for processing

9.2

Was TopoGrid used to process DEMs?

No

DEM and derivatives projection (general description)

Maryland State Plain

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

Variable Name in Reports

 

ADJCOEFF

Coefficient to adjust estimates for percentage of carbonate rock in Western Maryland

 

 Not applicable

Thomas and Moglen, 2010

WRIR 94-4020

BSLDEM10ff

Mean basin slope computed from 10 m DEM, in feet per foot

area-weighted mean

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

LSLOPE

 

DRNAREA

Area that drains to a point on a stream, in square miles

polygon area

GlobalWatershed

DA

A

FOREST

Percent of area covered by forest

percent of area in categories 41-43

Enhanced NLCD 1992, http://water.usgs.gov/lookup/getspatial?nlcde92

 

 

FOREST_MD

Percent area forested from Maryland Landuse 2010

percent area in categories 41-42

Maryland Office of Planning 2010 land use, http://planning.maryland.gov/OurWork/landuse.shtml

FOR

 

IMPERV

Percentage of the basin defined as impervious area

area-weighted mean

Maryland Office of Planning 2010 land use, http://planning.maryland.gov/OurWork/landuse.shtml

IA

 

LIME

Percentage of limestone within the watershed

percent of area

Thomas and Moglen, 2010

LIME

 

PRECIP

Mean annual precipitation, in inches

area-weighted mean

PRISM 1981-2010 normals, 800-meter grid, http://www.prism.oregonstate.edu/products/viewer.phtml?file=/pub/prism/us_30s/grids/ppt/Normals/us_ppt_1981_2010.14.asc.gz&year=1981_2010&vartype=ppt&month=14&status=final

 

 

STATSGOA

Percentage of area of Hydrologic Soil Type A from STATSGO

percent of area

http://www.soils.usda.gov/survey/geography/ssurgo/description_statsgo2.html

 

Sa

SSURGOA

Percentage of area of Hydrologic Soil Type A from SSURGO

percent of area

http://www.soils.usda.gov/survey/geography/ssurgo/description.html

SA

 

SOILCorD

Percentage of area of Hydrologic Soil Type C or D from SSURGO

percent of area

http://www.soils.usda.gov/survey/geography/ssurgo/description.html

Scd

 

STATSGOD

Percent of area of Hydrologic Soil Type D from STATSGO

percent of area

http://www.soils.usda.gov/survey/geography/ssurgo/description_statsgo2.html

 

Sd

LC11IMP

Percentage of impervious area determined from NLCD 2011 impervious dataset

area-weighted mean

http://www.mrlc.gov/nlcd2011.php 

General characteristic nationwide

Not applicable

LC11DEV

Percentage of urban area determined from NLCD 2011 landcover dataset

percent of area

http://www.mrlc.gov/nlcd2011.php 

General characteristic nationwide

Not applicable

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