Basin Characteristics Methods and Sources

Name Description Data source description Report details citation On-line data source
BRMETA Percent area of metamorphic rocks within the Blue Ridge Physiographic Region Summary layer generalized for physiography and geology based on maps presented in SIR 2011-5198 "Percent basin geology, generalized from Virginia Department of Mines, Minerals, and Energy, 2003, Digital representation of the 1993 Geologic Map of Virginia, Publication 174; Generalizations based on USGS publication: Sanford, W.E., Nelms, D.L., Pope, J.P., and Lelnick, D.L., 2012, Quantifying Components of the hydrologic cycle in Virginia using chemical hydrograph separation and multiple regression analysis: U.S. Geological Survey Scientific Investigations Report:2001-5198, 152 p. (available at https://pubs.usgs.gov/sir/2011/5198/pdf/2011-5198.pdf)" https://www.dmme.virginia.gov/commerce/ProductDetails.aspx?ProductID=1286
CB01BARE Percent barren from 2001 Chesapeake Bay land cover dataset "CBWLCD, 31, 32" "Chesapeake Bay Program, land cover data for 2001" cannot find a link current today. I would be OK if we removed these layers because I think they confuse the users.
CB01CRPHAY Percent cultivated crops and hay from 2001 Chesapeake Bay land cover dataset "CBWLCD, 82, 81" "Chesapeake Bay Program, land cover data for 2001"
CB01DEV Percent developed from 2001 Chesapeake Bay land cover dataset "CBWLCD, 21-24" "Chesapeake Bay Program, land cover data for 2001"
CB01FORSHB Percent forests and shrub lands from 2001 Chesapeake Bay land cover dataset "CBWLCD, 41-52" "Chesapeake Bay Program, land cover data for 2001"
CB01HERB Percent herbaceous from 2001 Chesapeake Bay land cover dataset "CBWLCD, 71" "Chesapeake Bay Program, land cover data for 2001"
CB01WATER Percent open water from 2001 Chesapeake Bay land cover dataset "CBWLCD, 11" "Chesapeake Bay Program, land cover data for 2001"
CB01WETLND Percent wetlands 2001 Chesapeake Bay land cover dataset "CBWLCD, 90 and 95" "Chesapeake Bay Program, land cover data for 2001"
CB06BARE Percent barren from 2006 Chesapeake Bay land cover dataset "CBWLCD, 31, 32" "Chesapeake Bay Program, land cover data for 2006" cannot find a link current today. I would be OK if we removed these layers because I think they confuse the users.
CB06CRPHAY Percent cultivated crops and hay from 2006 Chesapeake Bay land cover dataset "CBWLCD, 82, 81" "Chesapeake Bay Program, land cover data for 2006"
CB06DEV Percent developed 2006 Chesapeake Bay land cover dataset "CBWLCD, 21-24" "Chesapeake Bay Program, land cover data for 2006"
CB06FORSHB Percent forests and shrub lands from 2006 Chesapeake Bay land cover dataset "CBWLCD, 41-52" "Chesapeake Bay Program, land cover data for 2006"
CB06HERB Percent herbaceous from 2006 Chesapeake Bay land cover dataset "CBWLCD, 71" "Chesapeake Bay Program, land cover data for 2006"
CB06WATER Percent water from 2006 Chesapeake Bay land cover dataset "CBWLCD, 11" "Chesapeake Bay Program, land cover data for 2006"
CB06WETLND Percent wetlands from 2006 Chesapeake Bay land cover dataset "CBWLCD, 90 and 95" "Chesapeake Bay Program, land cover data for 2006"
CPSED Percent area of sedimentary rocks within the Coastal Plain Physiographic Region Summary layer generalized for physiography and geology based on maps presented in SIR 2011-5198 "Percent basin geology, generalized from Virginia Department of Mines, Minerals, and Energy, 2003, Digital representation of the 1993 Geologic Map of Virginia, Publication 174; Generalizations based on USGS publication: Sanford, W.E., Nelms, D.L., Pope, J.P., and Lelnick, D.L., 2012, Quantifying Components of the hydrologic cycle in Virginia using chemical hydrograph separation and multiple regression analysis: U.S. Geological Survey Scientific Investigations Report:2001-5198, 152 p. (available at https://pubs.usgs.gov/sir/2011/5198/pdf/2011-5198.pdf)" https://www.dmme.virginia.gov/commerce/ProductDetails.aspx?ProductID=1286
DRNAREA Area that drains to a point on a stream manually delineated and checked with digitally-derived from flow direction grid "Hayes, D.C., and Wiegand, Ute, 2006, Drainage areas of selected streams in Virginia: U.S. Geological Survey OpenFile Report 2006–1308, 51 p., available online at http://pubs.water.usgs.gov/ofr2006-1308" http://water.usgs.gov/GIS/metadata/usgswrd/XML/ofr2006-1308_Drainage_Basin.xml
ELEV Mean Basin Elevation "National Elevation Dataset 10m dataset, 2009"
http://nationalmap.gov
ELEVMAX Maximum basin elevation "National Elevation Dataset 10m dataset, 2009"
http://nationalmap.gov
I24H2Y Maximum 24-hour precipitation that occurs on average once in 2 years - Equivalent to precitation intensity index NOAA Precipitation Frequency Estimates "National Oceanic and Atmospheric Administration, 2007, National Weather Service Hydrometeorological Design Studies Center, precipitation frequency data server, accessed November 18, 2016, at http://dipper.nws.noaa.gov/hdsc/pfds/pfds_gis.html" http://dipper.nws.noaa.gov/hdsc/pfds/pfds_gis.html
LC01BARE "Percentage of area barren land, NLCD 2001 category 31" from NLCD 2001 V2 "Homer and others, 2007, Completion of the 2001 National Land Cover Database for the Conterminous United States. Photogrammetric Engineering and Remote Sensing, Vol. 73, No. 4, pp 337-341. " http://www.mrlc.gov/nlcd2001.php
LC01CRPHAY "Percentage of cultivated crops and hay, classes 81 and 82, from NLCD 2001" from NLCD 2001 V2 "Homer and others, 2007, Completion of the 2001 National Land Cover Database for the Conterminous United States. Photogrammetric Engineering and Remote Sensing, Vol. 73, No. 4, pp 337-341. " http://www.mrlc.gov/nlcd2001.php
LC01DEV Percentage of land-use from NLCD 2001 classes 21-24 from NLCD 2001 V2 "USGS National Land Cover Data for 2001: Homer and others, 2007, Completion of the 2001 National Land Cover Database for the Conterminous United States. Photogrammetric Engineering and Remote Sensing, Vol. 73, No. 4, pp 337-341. " http://www.mrlc.gov/nlcd2001.php
LC01FORSHB "Percentage of forests and shrub lands, classes 41 to 52, from NLCD 2001" from NLCD 2001 V2 "Homer and others, 2007, Completion of the 2001 National Land Cover Database for the Conterminous United States. Photogrammetric Engineering and Remote Sensing, Vol. 73, No. 4, pp 337-341. " http://www.mrlc.gov/nlcd2001.php
LC01HERB Percentage of herbaceous upland from NLCD 2001 class 71 from NLCD 2001 V2 "Homer and others, 2007, Completion of the 2001 National Land Cover Database for the Conterminous United States. Photogrammetric Engineering and Remote Sensing, Vol. 73, No. 4, pp 337-341. " http://www.mrlc.gov/nlcd2001.php
LC01IMP Average percentage of impervious land cover from NLCD 2001 Percent Impervious cover Data layer associated with the NLCD 2001 "USGS National Land Cover Data for 2001: Homer and others, 2007, Completion of the 2001 National Land Cover Database for the Conterminous United States. Photogrammetric Engineering and Remote Sensing, Vol. 73, No. 4, pp 337-341. " http://www.mrlc.gov/nlcd2001.php
LC01WATER "Percentage of open water, class 11, from NLCD 2001" from NLCD 2001 V2 "Homer and others, 2007, Completion of the 2001 National Land Cover Database for the Conterminous United States. Photogrammetric Engineering and Remote Sensing, Vol. 73, No. 4, pp 337-341. " http://www.mrlc.gov/nlcd2001.php
LC01WETLND "Percentage of wetlands, classes 90 and 95, from NLCD 2001" from NLCD 2001 V2 "Homer and others, 2007, Completion of the 2001 National Land Cover Database for the Conterminous United States. Photogrammetric Engineering and Remote Sensing, Vol. 73, No. 4, pp 337-341. " http://www.mrlc.gov/nlcd2001.php
LC06BARE Percentage of barren from NLCD 2006 class 31 from NLCD 2006 "Fry and others, 2011, Completion of the 2006 National Land Cover Database for the Conterminous United States PE&RS, Vol. 77 (9): 858-864" http://www.mrlc.gov/nlcd2006.php
LC06CRPHAY "Percentage of cultivated crops and hay, classes 81 and 82, from NLCD 2006" from NLCD 2006 "Fry and others, 2011, Completion of the 2006 National Land Cover Database for the Conterminous United States PE&RS, Vol. 77 (9): 858-864" http://www.mrlc.gov/nlcd2006.php
LC06DEV Percentage of land-use from NLCD 2006 classes 21-24 from NLCD 2006 "Fry and others, 2011, Completion of the 2006 National Land Cover Database for the Conterminous United States PE&RS, Vol. 77 (9): 858-864" http://www.mrlc.gov/nlcd2006.php
LC06FORSHB "Percentage of forests and shrub lands, classes 41 to 52, from NLCD 2006" from NLCD 2006 "Fry and others, 2011, Completion of the 2006 National Land Cover Database for the Conterminous United States PE&RS, Vol. 77 (9): 858-864" http://www.mrlc.gov/nlcd2006.php
LC06GRASS Percentage of grassland from NLCD 2006 class 71 from NLCD 2006 "Fry and others, 2011, Completion of the 2006 National Land Cover Database for the Conterminous United States PE&RS, Vol. 77 (9): 858-864" http://www.mrlc.gov/nlcd2006.php
LC06IMP Average percentage of impervious area determined from NLCD 2006 impervious dataset Percent Impervious cover Data layer associated with the NLCD 2006 "USGS National Land Cover Data for 2006: Fry and others, 2011, Completion of the 2006 National Land Cover Database for the Conterminous United States PE&RS, Vol. 77 (9): 858-864" http://www.mrlc.gov/nlcd2006.php
LC06WATER "Percent of open water, class 11, from NLCD 2006" from NLCD 2006 "Fry and others, 2011, Completion of the 2006 National Land Cover Database for the Conterminous United States PE&RS, Vol. 77 (9): 858-864" http://www.mrlc.gov/nlcd2006.php
LC06WETLND "Percentage of wetlands, classes 90 and 95, from NLCD 2006" from NLCD 2006 "Fry and others, 2011, Completion of the 2006 National Land Cover Database for the Conterminous United States PE&RS, Vol. 77 (9): 858-864" http://www.mrlc.gov/nlcd2006.php
LC11BARE Percentage of barren from NLCD 2011 class 31 from NLCD 2011 "Homer, C.G., Dewitz, J.A., Yang, L., Jin, S., Danielson, P., Xian, G., Coulston, J., Herold, N.D., Wickham, J.D., and Megown, K., 2015, Completion of the 2011 National Land Cover Database for the conterminous United States-Representing a decade of land cover change information. Photogrammetric Engineering and Remote Sensing, v. 81, no. 5, p. 345-354 " http://www.mrlc.gov/nlcd2011.php
LC11CRPHAY "Percentage of cultivated crops and hay, classes 81 and 82, from NLCD 2011" from NLCD 2011 "Homer, C.G., Dewitz, J.A., Yang, L., Jin, S., Danielson, P., Xian, G., Coulston, J., Herold, N.D., Wickham, J.D., and Megown, K., 2015, Completion of the 2011 National Land Cover Database for the conterminous United States-Representing a decade of land cover change information. Photogrammetric Engineering and Remote Sensing, v. 81, no. 5, p. 345-354 " http://www.mrlc.gov/nlcd2011.php
LC11DEV Percentage of developed (urban) land from NLCD 2011 classes 21-24 from NLCD 2011 "Homer, C.G., Dewitz, J.A., Yang, L., Jin, S., Danielson, P., Xian, G., Coulston, J., Herold, N.D., Wickham, J.D., and Megown, K., 2015, Completion of the 2011 National Land Cover Database for the conterminous United States-Representing a decade of land cover change information. Photogrammetric Engineering and Remote Sensing, v. 81, no. 5, p. 345-354 " http://www.mrlc.gov/nlcd2011.php
LC11FORSHB "Percentage of forests and shrub lands, classes 41 to 52, from NLCD 2011" from NLCD 2011 "Homer, C.G., Dewitz, J.A., Yang, L., Jin, S., Danielson, P., Xian, G., Coulston, J., Herold, N.D., Wickham, J.D., and Megown, K., 2015, Completion of the 2011 National Land Cover Database for the conterminous United States-Representing a decade of land cover change information. Photogrammetric Engineering and Remote Sensing, v. 81, no. 5, p. 345-354 " http://www.mrlc.gov/nlcd2011.php
LC11GRASS Percentage of grassland from NLCD 2011 class 71 from NLCD 2011 "Homer, C.G., Dewitz, J.A., Yang, L., Jin, S., Danielson, P., Xian, G., Coulston, J., Herold, N.D., Wickham, J.D., and Megown, K., 2015, Completion of the 2011 National Land Cover Database for the conterminous United States-Representing a decade of land cover change information. Photogrammetric Engineering and Remote Sensing, v. 81, no. 5, p. 345-354 " http://www.mrlc.gov/nlcd2011.php
LC11IMP Average percentage of impervious area determined from NLCD 2011 impervious dataset Percent Impervious cover Data layer associated with the NLCD 2011 "USGS National Land Cover Data 2011, Percent Developed Imperviousness citation: Xian, G., Homer, C., Dewitz, J., Fry, J., Hossain, N., and Wickham, J., 2011. The change of impervious surface area between 2001 and 2006 in the conterminous United States. Photogrammetric Engineering and Remote Sensing, Vol. 77(8): 758-762. " http://www.mrlc.gov/nlcd2011.php
LC11WATER "Percent of open water, class 11, from NLCD 2011" from NLCD 2011 "Homer, C.G., Dewitz, J.A., Yang, L., Jin, S., Danielson, P., Xian, G., Coulston, J., Herold, N.D., Wickham, J.D., and Megown, K., 2015, Completion of the 2011 National Land Cover Database for the conterminous United States-Representing a decade of land cover change information. Photogrammetric Engineering and Remote Sensing, v. 81, no. 5, p. 345-354 " http://www.mrlc.gov/nlcd2011.php
LC11WETLND "Percentage of wetlands, classes 90 and 95, from NLCD 2011" from NLCD 2011 "Homer, C.G., Dewitz, J.A., Yang, L., Jin, S., Danielson, P., Xian, G., Coulston, J., Herold, N.D., Wickham, J.D., and Megown, K., 2015, Completion of the 2011 National Land Cover Database for the conterminous United States-Representing a decade of land cover change information. Photogrammetric Engineering and Remote Sensing, v. 81, no. 5, p. 345-354 " http://www.mrlc.gov/nlcd2011.php
LFREGNO Low-Flow Region Number from grid developed by the USGS Virginia-West Virginia Water Science Center

MESZOIC Percent of area within the Mesozoic Basins Summary layer generalized for physiography and geology based on maps presented in SIR 2011-5198 "Percent basin geology, generalized from Virginia Department of Mines, Minerals, and Energy, 2003, Digital representation of the 1993 Geologic Map of Virginia, Publication 174; Generalizations based on USGS publication: Sanford, W.E., Nelms, D.L., Pope, J.P., and Lelnick, D.L., 2012, Quantifying Components of the hydrologic cycle in Virginia using chemical hydrograph separation and multiple regression analysis: U.S. Geological Survey Scientific Investigations Report:2001-5198, 152 p. (available at https://pubs.usgs.gov/sir/2011/5198/pdf/2011-5198.pdf)" https://www.dmme.virginia.gov/commerce/ProductDetails.aspx?ProductID=1286
MINBELEV Minimum basin elevation "National Elevation Dataset 10m dataset, 2009"
http://nationalmap.gov
PDIGMET Percent area of igneous and metamorphic within the Piedmont Physiographic Region Summary layer generalized for physiography and geology based on maps presented in SIR 2011-5198 "Percent basin geology, generalized from Virginia Department of Mines, Minerals, and Energy, 2003, Digital representation of the 1993 Geologic Map of Virginia, Publication 174; Generalizations based on USGS publication: Sanford, W.E., Nelms, D.L., Pope, J.P., and Lelnick, D.L., 2012, Quantifying Components of the hydrologic cycle in Virginia using chemical hydrograph separation and multiple regression analysis: U.S. Geological Survey Scientific Investigations Report:2001-5198, 152 p. (available at https://pubs.usgs.gov/sir/2011/5198/pdf/2011-5198.pdf)" https://www.dmme.virginia.gov/commerce/ProductDetails.aspx?ProductID=1286
PKREGNO Peak-Flow Region Number from grid developed by the USGS Virginia-West Virginia Water Science Center

PRECIP Mean Annual Precipitation PRISM precipitation Normals average annual conditions1971-2000 "PRISM Climate Group, Oregon State University, 2007, Mean annual precipitation from 1971 to 2000 and average monthly rainfall for January, February, and March, accessed May 5, 2008, at http://prism.oregonstate.edu/products/matrix.phtml." http://prism.nacse.org/normals/
RELIEF Maximum - minimum elevation "National Elevation Dataset 10m dataset, 2009"
http://nationalmap.gov
STATOM19_8 Percentage of soils with greater than 7.3 percent and less than or equal to 19.8 percent organic matter from STATSGO "ussoils, om" "USSOILS is an Arc 7.0 coverage containing hydrology-relevant information for 10,498 map units covering the entire conterminous United St" http://water.usgs.gov/GIS/metadata/usgswrd/XML/ussoils.xml
STATOM55_7 Percentage of soils with greater than 19.8 percent and less than or equal to 55.7 percent organic matter from STATSGO "ussoils, om" "USSOILS is an Arc 7.0 coverage containing hydrology-relevant information for 10,498 map units covering the entire conterminous United St" http://water.usgs.gov/GIS/metadata/usgswrd/XML/ussoils.xml
STATSCLAY10 Percentage of soils with less than 10 percent clay from STATSGO "ussoils, clay" "USSOILS is an Arc 7.0 coverage containing hydrology-relevant information for 10,498 map units covering the entire conterminous United St" http://water.usgs.gov/GIS/metadata/usgswrd/XML/ussoils.xml
STATSCLY20 Percentage of soils with greater than 10 percent and less than or equal to 20 percent clay from STATSGO "ussoils, clay" "USSOILS is an Arc 7.0 coverage containing hydrology-relevant information for 10,498 map units covering the entire conterminous United St" http://water.usgs.gov/GIS/metadata/usgswrd/XML/ussoils.xml
STATSCLY30 Percentage of soils with greater than 20 percent and less than or equal to 30 percent clay from STATSGO "ussoils, clay" "USSOILS is an Arc 7.0 coverage containing hydrology-relevant information for 10,498 map units covering the entire conterminous United St" http://water.usgs.gov/GIS/metadata/usgswrd/XML/ussoils.xml
STATSCLY40 Percentage of soils with greater than 30 percent and less than or equal to 40 percent clay from STATSGO "ussoils, clay" "USSOILS is an Arc 7.0 coverage containing hydrology-relevant information for 10,498 map units covering the entire conterminous United St" http://water.usgs.gov/GIS/metadata/usgswrd/XML/ussoils.xml
STATSCLY50 Percentage of soils with greater than 40 percent and less than or equal to 50 percent clay from STATSGO "ussoils, clay" "USSOILS is an Arc 7.0 coverage containing hydrology-relevant information for 10,498 map units covering the entire conterminous United St" http://water.usgs.gov/GIS/metadata/usgswrd/XML/ussoils.xml
STATSCLY60 Percentage of soils with greater than 50 percent and less than or equal to 60 percent clay from STATSGO "ussoils, clay" "USSOILS is an Arc 7.0 coverage containing hydrology-relevant information for 10,498 map units covering the entire conterminous United St" http://water.usgs.gov/GIS/metadata/usgswrd/XML/ussoils.xml
STATSGODEP Area-weighted average soil depth from NRCS STATSGO database "ussoils, thick" "USSOILS is an Arc 7.0 coverage containing hydrology-relevant information for 10,498 map units covering the entire conterminous United St" http://water.usgs.gov/GIS/metadata/usgswrd/XML/ussoils.xml
STATSOM0_5 Percentage of soils with less than 0.5 percent organic matter from STATSGO "ussoils, om" "USSOILS is an Arc 7.0 coverage containing hydrology-relevant information for 10,498 map units covering the entire conterminous United St" http://water.usgs.gov/GIS/metadata/usgswrd/XML/ussoils.xml
STATSOM2_6 Percentage of soils with greater than 0.50 percent and less than or equal to 2.60 percent organic matter from STATSGO "ussoils, om" "USSOILS is an Arc 7.0 coverage containing hydrology-relevant information for 10,498 map units covering the entire conterminous United St" http://water.usgs.gov/GIS/metadata/usgswrd/XML/ussoils.xml
STATSOM7_3 Percentage of soils with greater than 2.6 percent and less than or equal to 7.3 percent organic matter from STATSGO "ussoils, om" "USSOILS is an Arc 7.0 coverage containing hydrology-relevant information for 10,498 map units covering the entire conterminous United St" http://water.usgs.gov/GIS/metadata/usgswrd/XML/ussoils.xml
STATSPERM Area-weighted average soil permeability from NRCS STATSGO database "Ussoils, perm" "USSOILS is an Arc 7.0 coverage containing hydrology-relevant information for 10,498 map units covering the entire conterminous United St" http://water.usgs.gov/GIS/metadata/usgswrd/XML/ussoils.xml
STATSWATCP Available water capacity of the top 60 inches of soil - determined from STATSGO data "Ussoils, awc" "USSOILS is an Arc 7.0 coverage containing hydrology-relevant information for 10,498 map units covering the entire conterminous United St" http://water.usgs.gov/GIS/metadata/usgswrd/XML/ussoils.xml
VRCARB Percent of area of carbonate rocks within the Valley and Ridge Physiographic Region Summary layer generalized for physiography and geology based on maps presented in SIR 2011-5198 "Percent basin geology, generalized from Virginia Department of Mines, Minerals, and Energy, 2003, Digital representation of the 1993 Geologic Map of Virginia, Publication 174; Generalizations based on USGS publication: Sanford, W.E., Nelms, D.L., Pope, J.P., and Lelnick, D.L., 2012, Quantifying Components of the hydrologic cycle in Virginia using chemical hydrograph separation and multiple regression analysis: U.S. Geological Survey Scientific Investigations Report:2001-5198, 152 p. (available at https://pubs.usgs.gov/sir/2011/5198/pdf/2011-5198.pdf)" https://www.dmme.virginia.gov/commerce/ProductDetails.aspx?ProductID=1286
VRPLSLC Percent of area of siliciclastic rocks witin the Valley and Ridge or Appalachian Plateau Physiographic Regions Summary layer generalized for physiography and geology based on maps presented in SIR 2011-5198 "Percent basin geology, generalized from Virginia Department of Mines, Minerals, and Energy, 2003, Digital representation of the 1993 Geologic Map of Virginia, Publication 174; Generalizations based on USGS publication: Sanford, W.E., Nelms, D.L., Pope, J.P., and Lelnick, D.L., 2012, Quantifying Components of the hydrologic cycle in Virginia using chemical hydrograph separation and multiple regression analysis: U.S. Geological Survey Scientific Investigations Report:2001-5198, 152 p. (available at https://pubs.usgs.gov/sir/2011/5198/pdf/2011-5198.pdf)" https://www.dmme.virginia.gov/commerce/ProductDetails.aspx?ProductID=1286