General Information

Project area general description

The state of Maine

Are any areas excluded?

 Yes. Several regulated rivers.  Border areas around the State

Types of flow statistics available

Statewide Peak flows and mean and median flows; regional lowflows and bankfull flows

ArcGIS version used for processing

Originally 10.1, with some updates using 10.2

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

 10 m

DEM source

10-m DEM, USGS National Map
http://nationalmap.gov/index.html

Hydrography source

NHDPlus hi-res ( mostly 1:24,000 NHD snapshot) http://www.horizon-systems.com/NHDPlus/NHDPlusV2_home.php

Hydrologic unit "walls" source

NHDPlus V2 (WBD snapshot) http://www.horizon-systems.com/NHDPlus/NHDPlusV2_home.php

Gage basin boundaries source

USGS Gage Basins polygon shapefile

Interactive map snapping tolerance

3 cells

 

Basin Characteristics Methods and Sources

Name

Description

Computation method

Data source

Report

Variable label in report

 

 

 

 

 

 

COASTDIST

Distance from the coast to basin centroid in miles

length

Euclidean distance raster derived from Gulf of Maine polyline.

Dudley (2004)

DIST           

 

 

 

 

Lombard(2010)

GOMDIST

DRNAREA

Drainage Area

polygon area

10-m DEM, USGS National Map
http://nationalmap.gov/index.html

Dudley (2004)

A

 

 

 

 

Hodgkins(1999)

A

ELEV

Mean Basin Elevation, in feet

area-weighted mean

10-m DEM, USGS National Map
http://nationalmap.gov/index.html

Lombard and others (2003)

E

 

 

 

 

 

 

PRDECFEB90

Mean Winter Precipitation in inches

area-weighted mean

Maine data - NRCS PRISM grids Dec,Jan,Feb 1961-1990 Coverages downloaded from http://www.prism.oregonstate.edu/                          Canadian and New Hampshire data - NHDPlus product, Dec, Jan, Feb precip grids, data range from 1971-2000  downloaded from ftp://ftpint.usgs.gov/private/wr/id/boise/Rea/NAmericaClimateGrids/

Dudley (2004)

pptW

 

 

 

 

 

 

PRECIP

Mean Annual Precipitation in inches

area-weighted mean

Maine data - NRCS PRISM grids, annual data 1961-1990 Coverages downloaded from http://www.prism.oregonstate.edu/                          Canadian and New Hampshire data - NHDPlus product, annual precip grids, data range from 1971-2000  downloaded from ftp://ftpint.usgs.gov/private/wr/id/boise/Rea/NAmericaClimateGrids/

Dudley (2004)

pptA

 

 

 

 

 

 

SANDGRAVAP

Percentage of Sand and Gravel Aquifers

percent of area

Maine data - Polygon shape file downloaded from http://www.maine.gov/megis/catalog/shps/state/aquifer_polygonss.zip                                              New Hampshire data - Polygon shapefile downloaded from http://www.granit.sr.unh.edu/data/downloadfreedata/category/databycategory.html                                          

Lombard (2010)

PCTSNDGRV

 

 

 

 

 

 

SANDGRAVAF

Fraction of Sand and Gravel Aquifers

fractional part of area

Maine data - Polygon shape file downloaded from http://www.maine.gov/megis/catalog/shps/state/aquifer_polygonss.zip                                              New Hampshire data - Polygon shapefile downloaded from http://www.granit.sr.unh.edu/data/downloadfreedata/category/databycategory.html                                          

Dudley (2004)   

SG                   

 

 

 

 

Lombard(2004)

Aq

STORNWI

Percent storage

percent of area

Maine and New Hampshire data - USF&W National Wetland Inventory Maps downloaded from http://www.fws.gov/wetlands/data/Data-Download.html                                                        Canadian data - Canadian Wildlife Service Wetland Inventory Maps downloaded from  http://maps.ducks.ca/cwi/    and   http://www.geobase.ca/geobase/en/data/landcover/csc2000v/description.html

Hodgkins (1999)

W

 

 

 

 

 

 

LC11IMP

Percentage of area covered by impervious surfaces, from NLCD 2011

area-weighted mean

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LC11DEV

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

percent of area

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

 

 

 

 

 

 

 

 

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