20260410
20584600
1.0
FALSE
GEO_DTW_WET_new
002
-8437212.396035
-8354292.396035
4642980.057551
4843020.057551
1
file://\\Dtifs01\apd\GIS\current\DepthToWater.gdb
Local Area Network
Projected
GCS_WGS_1984
Linear Unit: Meter (1.000000)
WGS_1984_Web_Mercator_Auxiliary_Sphere
<ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/3.3.0'><WKT>PROJCS["WGS_1984_Web_Mercator_Auxiliary_Sphere",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Mercator_Auxiliary_Sphere"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",0.0],PARAMETER["Standard_Parallel_1",0.0],PARAMETER["Auxiliary_Sphere_Type",0.0],UNIT["Meter",1.0],AUTHORITY["EPSG",3857]]</WKT><XOrigin>-20037700</XOrigin><YOrigin>-30241100</YOrigin><XYScale>148923141.92838538</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>0.001</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><WKID>102100</WKID><LatestWKID>3857</LatestWKID></ProjectedCoordinateSystem>
ProjectRaster dtw_wet \\Dtifs01\apd\GIS\current\DepthToWater.gdb\GEO_DTW_WET_new PROJCS["WGS_1984_Web_Mercator_Auxiliary_Sphere",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Mercator_Auxiliary_Sphere"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",0.0],PARAMETER["Standard_Parallel_1",0.0],PARAMETER["Auxiliary_Sphere_Type",0.0],UNIT["Meter",1.0]] "Nearest neighbor" "30 30" WGS_1984_(ITRF00)_To_NAD_1983 # PROJCS["NAD_1983_UTM_Zone_18N",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-75.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0]] NO_VERTICAL
Rename \\Dtifs01\apd\GIS\current\DepthToWater.gdb\GEO_DTW_WET_new \\Dtifs01\apd\GIS\current\DepthToWater.gdb\GEO_DTW_WET RasterDataset
20260413
10260700
20260413
10260700
Delaware Geological Survey
(302)-831-2833
302-831-3579
University of Delaware,
Delaware Geological Survey Bldg
Newark
DE
19716
US
delgeosurvey@udel.edu
20250729
ArcGIS Metadata
1.0
Delaware Geological Survey
(302)-831-2833
302-831-3579
257 Academy St
University of Delaware.
Delaware Geological Survey Bldg
Newark
DE
19716
US
delgeosurvey@udel.edu
Digital Data
https://enterprise.firstmap.delaware.gov/arcgis/rest/services/Geology/DGS_DepthToWater/MapServer
https://www.dgs.udel.edu/
File Geodatabase Raster Dataset
DGS_DepthToWater_Wet
2005
Matthew J. Martin and A. Scott Andres
Delaware Geological Survey
Newark, DE
raster digital data
<div style='text-align:Left;'><div><div><p><span>This digital product contains gridded estimates of depth to water (dtw) under wet conditions for Delaware. This work is the final component of a larger effort to provide estimates of water-table elevations and depths to water for the Coastal Plain portion of Delaware. Mapping was supported by the Delaware Department of Natural Resources and Environmental Control and the Delaware Geological Survey. These grids were produced with the same multiple linear regression (MLR) method as Andres and Martin (2005). Briefly, this method consists of: identifying dry, normal, and wet periods from long-term observation well data (Nc45-01, Ng11-01, Qe44-01); estimating a minimum water table (Sepulveda, 2002) by fitting a localized polynomial surface to elevations of surface water features (e.g., streams, swamps, and marshes); and computing a second variable in the regression from water levels observed in wells. A separate MLR equation was determined for dry, normal, and wet periods, and these equations were used in ArcMap v.9 (ESRI, 2004) to estimate grids of water-table elevations and depths to water. The grids have 30-m horizontal and 1-ft vertical resolutions. Grid world files and ground-water level observation data are in UTM-18N, 1983 projection in meters and elevations are in feet, NAVD 1988. Files are in ESRI, Inc., grid format. These data were combined from DGS Digital Data Products DP05-01, DP05-03, and DP05-04 Digital Water-Table Data for Sussex, Kent, and New Castle counties, Delaware, respectively. REFERENCES CITED Andres, A. S., and Martin, M. J., 2005, Estimation of the water-table surface for the Inland Bays watershed, Delaware: Delaware Geological Survey Report of Investigations No. 68, 20p. ESRI, 2004, ArcMap v. 9, Redlands, California. Sepulveda, N., 2003, A statistical estimator of the spatial distribution of the water-table altitude: Ground Water, vol. 41, p. 66-71.</span></p></div></div></div>
This work is part of a larger effort to provide estimates of water-table elevations and depths to water for the Coastal Plain portion of Delaware. These maps will be used in risk assessments and for environmental management decision-making.
Matthew J. Martin and A. Scott Andres
Delaware Geological Survey
(302)-831-2833
302-831-3579
257 Academy St
University of Delaware,
Delaware Geological Survey Bldg
Newark
DE
19716
US
delgeosurvey@udel.edu
Delaware
Kent County
Sussex County
New Castle County
GNIS
inlandWaters
water table
groundwater
Coastal Plain
inlandWaters
ISO 19115 Topic Categories
New Castle
Milton
South Bethany
Blades
Felton
groundwater
Arden
Kent County
Kenton
Wyoming
Ardencroft
Bethel
Bethany Beach
Greenwood
Dagsboro
Seaford
Little Creek
Frankford
Millsboro
Ellendale
Millville
Hartly
Water Table
inlandWaters
Elsmere
Camden
Lewes
Farmington
Townsend
Woodside
Henlopen Acres
Wilmington
Harrington
Viola
Leipsic
Selbyville
Smyrna
Delaware Hydrology
Houston
Bridgeville
Rehoboth Beach
Ocean View
Newark
Middletown
Fenwick Island
Milford
Georgetown
New Castle County
Delmar
Frederica
Magnolia
Laurel
Claymont
Newport
Bellefonte
Odessa
Delaware
Clayton
Sussex County
Dover
Slaughter Beach
<div style='text-align:Left;'><div><div><p><span>The Delaware Geological Survey (DGS) is constantly gathering data from multiple sources, interpreting data, and reflecting its interpretations in a variety of data formats. DGS's interpretations are conceptualized in these grids of Depth to Water for Delaware. The water table is a continuous surface; however, observations of the surface exist at irregularly spaced locations. In this instance, regularly spaced grids of water-table elevations were estimated from site-specific observational data and are the model used to represent the water-table surface. Reasonable efforts have been made by the DGS to verify that the digital data provided herein accurately interpret the source data used in its preparation. These are estimated surfaces and they may be inappropriate for some applications. Detailed site-specific investigation may be required for evaluating individual sites. Persons wishing to apply the data in these grids to more detailed scales are encouraged to contact the DGS office for advisement. Nothing contained herein shall be deemed an expressed or implied waiver of the sovereign immunity of the University of Delaware and the State of Delaware or their duly authorized representatives, agents, or employees. Additional Information In order to provide complete data coverage for the entire Coastal Plain, Sussex County, Kent County, and New Castle County grids (Digital Products DP05-01, DP05-03, and Dp05-04) were merged together. Further manipulation of these data grids by the user is done solely at the descretion of the user.</span></p></div></div></div>
The Delaware Geological Survey (DGS) is constantly gathering data from multiple sources, interpreting data, and reflecting its interpretations in a variety of data formats. DGS's interpretations are conceptualized in these grids of Depth to Water for Kent County, DE. The water table is a continuous surface; however, observations of the surface exist at irregularly spaced locations. In this instance, regularly spaced grids of water-table elevations were estimated from site-specific observational data and are the model used to represent the water-table surface. Reasonable efforts have been made by the DGS to verify that the digital data provided hereon accurately interpret the source data used in its preparation. These are estimated surfaces and they may be inappropriate for some applications. Detailed site-specific investigation may be required for evaluating individual sites. Persons wishing to apply the data in these grids to more detailed scales are encouraged to contact the DGS office for advisement. Nothing contained herein shall be deemed an expressed or implied waiver of the sovereign immunity of the State of Delaware or its duly authorized representatives, agents, or employees.
None.
Esri ArcGIS 13.2.2.49743
true
-75.801084
-75.040087
39.844843
38.445943
ground condition
2005
Andres, A.S., and Martin, M.J., 2005, Estimation of the water-table surface for the Inland Bays watershed, Delaware: Delaware Geological Survey Report of Investigations No. 68, 20 p.
Sepulveda, N., 2003, A statistical estimator of the spatial distribution of the water-table altitude: Ground Water, vol. 41, p. 66-71.
1
-75.792769
-75.047885
39.842079
38.448507
tabular digital data
3
1891
1950
1
VAT_ri73_aq_unconf_dtw_dry
Table
132
ObjectID
Internal feature number.
ESRI
Sequential unique whole numbers that are automatically generated.
OBJECTID
OID
4
0
0
Value
Depth to water in feet below land surface.
VALUE
Integer
4
0
0
Count
This refers to the total number of grid cells within the raster grid that have a particular "value" (see above).
COUNT
Integer
4
0
0
dataset
EPSG
6.18.3(9.3.1.2)
Pixel
6668
2764
30.000000
30.000000
8
1
Upper Left
FALSE
LZ77
1
pixel codes
FGDBR
TRUE
row and column
30.000000
30.000000