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FALSE
20180808
11574200
20180808
11574200
FALSE
GISVIEW.MEDWP.WellModels
341939.048200
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1
1.186
002
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GCS_North_American_1983
NAD_1983_UTM_Zone_19N
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(MEDHHSDWP) Maine Department of Health and Human Services, Drinking Water Program
Manager Source Water Protection
(207) 287-6196
State House Station 11
Augusta
ME
04333-0010
US
20180808
ArcGIS Metadata
1.0
GIS Coordinator
(MEGIS) Maine Office of Geographic Information Systems
GIS Coordinator
207 624-7700
207 287-3842
State House Station 174
Augusta
ME
04333-0174
US
Monday through Friday 0800 - 1700 EST
Data may be downloaded from Maine GIS Internet Data Catalog at no charge.
Data is available for immediate download from the Maine GIS Internet Data Catalog.
ESRI Shapefile
ARC Version 9.x
ArcView Shapefile Format
Data available from this website is in .zip compressed format. WinZip is a Windows based, PKZip-compatible compression utility. You will need a program like this to extract the data. A link to a trial copy WinZip software is available at http://megis.maine.gov/links/.
MEGIS has made all vector layers, in the Maine GIS Internet Data Catalog, available in ESRI's ArcView shapefile format. A shapefile is a simple non-topological format that stores the geometry and attribute information for a set of geographic features as a set of vector (point, line, polygon) coordinates. Shapefiles draw quickly and directly in ArcView, ArcGIS, ArcExplorer. Shapefiles are a compatible data type for many other types of GIS software. Three files are fundamental to each shapefile: .shp stores the feature geometry (shape and location information); .shx stores the index of the feature geometry; .dbf a dBASE (TM) file stores the attribute information for the features. Other index files may be created to help speed analysis and query: these file formats are .sbn .sbx .ain .aix .fbn and .fbx. In addition you may find projection .prj, and metadata .xml, files associated with shapefiles.
http://megis.maine.gov/catalog/
These data are available to Internet browsers for download from the Maine GIS Internet Data Catalog - http://megis.maine.gov/catalog/ Data available from this website is in .zip compressed format. WinZip is a Windows based, PKZip-compatible compression utility. You will need a program like this to extract the data. A link to a trial copy WinZip software is available at http://megis.maine.gov/links/ If you are not already a GIS user, free software for viewing these files is available from Environmental Systems Research Institute, Inc. (ESRI) - www.esri.com See http://megis.maine.gov/links/ for a link to ArcExplorer 9.x .
Maine Office of Geographic Information Systems
GIS Coordinator
(207) 624-7700
(207) 287-3842
State House Station 174
Augusta
ME
04333-0174
US
Monday through Friday 0800 - 1700 EST
Access is available through Maine's wide area network; WAN users may contact the Maine Office of Information Technology, Maine Office of Geographic Information Systems (MEGIS) for a login.
ArcSDE 9.x
Oracle 9i
http://megis.maine.gov/catalog/
Feature Class
10.1
GISVIEW.MEDWP.WellModels
2004-04-01
Maine Office of Geographic Information Systems (MEGIS)
Augusta ME
Maine Department of Human Services (MEDHS), Drinking Water Program
vector digital data
Source Water Protection Area (SWPA)
Maine Public Water Supply
1:24000 WELLMODS contains bedrock source water protection areas and polygons of sand/gravel 200 and 2500 day travel times. Both models were developed by the Maine Geological Survey (MGS) under an agreement with the Maine Drinking Water Program. MGS defined three levels of probability of contribution by bedrock source water protection areas to a well: low, moderate, and high, depending on the number of simulations where flow occurred. Only high and moderate probability areas are depicted in this dataset. MGS performed most of the S&G travel time modeling, while consultants for public water suppliers performed the remainder.
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>WELLMODS contains bedrock source water protection areas and sand/gravel aquifer areas with 200-2500 day travel time in with a probability of contributing water to community public water supplies in Maine. The dataset is suitable for mapping at 1:24,000 or larger scale. The Maine Drinking Water Program (MEDWP), in cooperation with the Maine Geological Survey (MGS) has conducted probabilistic digital modeling of the contributing areas to selected community public water supplies. The models were run using the U.S. Geological Survey finite-difference ground-water flow model MODFLOW and the particle tracking package MODPATH. Available geologic and pump test data formed the primary inputs to the models. Additional information on MODFLOW and MODPATH and water resource modeling techniques is available at http://water.usgs.gov/nrp/gwsoftware/modflow.html and http://water.usgs.gov/pubs/twri/twri6a1/ .</SPAN></P></DIV></DIV></DIV>
WELLMODS was developed for use by the Maine Drinking Water Program and other entities to locate bedrock source water protection areas and sand/gravel aquifer areas with 200-2500 day travel times for Maine. Its primary purpose is to assist in management of spatial information about PWSs in compliance with the federal Safe Drinking Water Act as Amended 1996 and 22 MRSA Chapter 601. Detailed design decisions may require additional locational data. Field verification of location, ownership, and other attributes is strongly recommended. These data were developed with financial support from U.S. Environmental Protection Agency (USEPA).
Dataset developed by Maine Drinking Water Program, with logistical and financial support from USEPA.
(MEDHHSDWP) Maine Department of Health and Human Services, Drinking Water Program
Manager Source Water Protection
(207) 287-6196
State House Station 11
Augusta
ME
04333-0010
US
Maine GIS Thesaurus-Place
United States
Maine
GCMD Parameter Keyword
hydrosphere
human dimensions
ISO Keyword Thesaurus
geoscientificInformation
inlandWaters
environment
utilitiesCommunication
planningCadastre
health
Maine GIS Thesaurus-Theme
travel time areas
hydrogeology
ground water
public water supply
sand and gravel
source water protection areas
United States
travel time areas
geoscientificInformation
inlandWaters
hydrosphere
environment
Maine
human dimensions
utilitiesCommunication
planningCadastre
health
hydrogeology
ground water
public water supply
sand and gravel
source water protection areas
Users must assume responsibility to determine the usability of this data for their purposes. Although these data have been processed successfully on a computer system at the Maine Office of Geographic Information Systems, no warranty expressed or implied is made by MEGIS regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. Neither the Maine Office of Geographic Information Systems, nor any of its contributors, is liable for misuse of the data, for damage, for transmission of viruses, or for computer contamination through the distribution of these data sets.
Users must assume responsibility to determine the usability of this data for their purposes.
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Detailed design decisions may require additional locational data. Field verification of location, ownership, and other attributes is strongly recommended. Users must assume responsibility in determining the usability of this data for their purposes. Digital maps retain the accuracy of their source materials. The best use of data mapped at scales of 1:500,000 and 1:250,000 is in statewide planning and studies; at 1:100,000 in regional planning and studies; at 1:62,500 and 1:24,000 in detailed studies and local planning; and at 1:12,000 and 1:5,000 or larger scales in parcel level studies and detailed local planning. In the use of Maine GIS data, please check sources, scale, accuracy, currentness and other available information. Please confirm that you are using the correct copy of both data and metadata from the Maine GIS Data Catalog. Updates, corrections, and feedback, incorporated in the Maine GIS database are made in accordance with "Data Standards for Maine Geographic Information Systems", 2002, and coordinated by MEGIS</SPAN></P></DIV></DIV></DIV>
wellsbuf_old
2004-04-01
Maine Office of Geographic Information Systems (MEGIS)
Augusta ME
Maine Department of Human Services (MEDHS), Drinking Water Program (MEDWP)
vector digital data
Source Water Protection Area (SWPA)
Maine Public Water Supply
1:24000 Circular buffers for wells ranging from 300 to 2,500 feet in radius, based on the population served by the system. These circular buffers are used for systems where there is no model developed.
http://megis.maine.gov/catalog/
wells
2004-04-01
Maine Department of Human Services (MEDHS), Drinking Water Program (MEDWP)
Maine Office of Geographic Information Systems (MEGIS)
Augusta ME
vector digital data
Source Water Protection Area (SWPA)
Maine Public Water Supply
1:24000 WELLS contains point locations for Maine's over 2500 wells and springs serving public water supplies.
http://megis.maine.gov/catalog/
Version 6.2 (Build 9200) ; Esri ArcGIS 10.4.1.5713
ground condition
2001-08-01
2003-10-01
-70.94642
-66.90909
43.22902
47.30031
1
-71.090831
-66.908948
47.319393
43.229013
Last metadata review date: 20100120
All polygons have a single unique user-id number. Spatial topology meets "Data Standards for Maine Geographic Information Systems", June 2002.
All polygons have a single unique user-id number. Spatial topology meets "Data Standards for Maine Geographic Information Systems", June 2002.
The data set is complete. Maine Geological Survey defined three levels of probability of contribution by bedrock source water protection areas to a well: low, moderate, and high, depending on the number of simulations where flow occurred. Only high and moderate probability areas are depicted in this dataset.
Attribute data are extracted from the State Drinking Water Information System (SIDWIS). Although this information is updated and checked for quality purposes on a regular basis, there are errors in the data. Additionally, the ownership of some PWSs changes over time, and should be checked for currency. Supplies may also be used seasonally, and may not be active. Supplies may go off-line, or be abandoned and the MEDWP may not be informed of their change in status.
Most attribute data is correct, but there are some data entry errors, and some information is based on owner's recollection, or may not be current.
good
GPS data were differentially corrected using Trimble base station data. Accuracy of the well locations which were collected by GPS can range from 1 cm to over 100 meters depending on the number of satellites in view, the position of satellites in relation to each other, the strengths of the satellite signals and the distance of the base station from the GPS receiver. Geoexplorers typically provide accuracy ranges of 2 to 5 meters. Polygons were developed using ground water models to estimate contributing areas. These models are dependent on estimates of subsurface geologic conditions, and new information about these conditions could require model update.
Well model polygons were developed using ground water models to estimate contributing areas. These models are dependent on estimates of subsurface geologic conditions at public water supply well locations, and new information about geologic conditions could require model update. GPS data were differentially corrected using Trimble base station data. Parameters set for MEDHHS GPS collection Geoexplorers typically provide accuracy ranges of 2 to 5 meters.
5
24000
(MEDWPGPS) Maine Drinking Water Program GPS, 1991-2003
medwpgps
Maine Department of Human Services (MEDHS), Drinking Water Program (MEDWP)
tabular digital data
Locations in 1996-2003 were collected using Trimble Geoexplorer Global Positioning System (GPS) receivers. Locations in 1991 and 1995 were collected using Trimble Pathfinder GPS Receivers. GPS is a satellite-based positioning system operated and maintained by the U.S. Department of Defense. It consists of 24 NAVSTAR satellites that orbit the earth every twelve hours at an altitude of approximately 12,600 miles, as well as ground-based monitor and upload stations, which track and monitor the satellite orbits, and a master control station. GPS receivers use the signals sent by the satellites to determine where the satellites are and then use this information to calculate the user's position on the earth. Accuracy can range from 1 cm to over 100 meters depending on the number of satellites in view, the position of satellites in relation to each other, the strengths of the satellite signals and the distance of the base station from the GPS receiver. Geoexplorers typically provide accuracy ranges of 2 to 5 meters. Locations have been mapped using the North American Datum 27 (NAD27) later converted to NAD83 in Universal Transverse Mercator (UTM) coordinate system.
ground condition
1991-01-01
2003-01-01
500000
bedrock
bedrock
1995-01-01
Maine Office of Geographic Information Systems
Augusta ME
Maine Department of Conservation (MEDOC), Maine Geological Survey (MGS)
vector digital data
Maine GIS
SDE server; Internet Data Catalog
1:500000 Bedrock UNIT codes assigned to this coverage are available in comma delimited text, and .dbf format, on the MEGIS Data Catalog at http://megis.maine.gov/catalog/ .
http://megis.maine.gov/catalog/
source dates
1985-12-31
1994-12-31
Source mapping for WELLMODS.
24000
sgtime
sgtime
2002-10-01
Maine Department of Human Services (MEDHS), Drinking Water Program
Maine Office of Geographic Information Systems (MEGIS)
Augusta ME
vector digital data
Source Water Protection Area (SWPA)
Maine Public Water Supply
1:24000
http://megis.maine.gov/catalog/
ground condition
1994-01-01
2002-10-01
Existing Sand and Gravel Aquifer maps and existing unpublished MGS data, together with well exploration conducted by the water districts, provided a good base of knowledge at most sites for sand and gravel travel time modeling.
50000
(SAGA) Sand and Gravel Aquifer Maps
saga
1981-12-31
Maine Geological Survey (MGS)
Maine Geological Survey
Augusta ME
atlas
Sand and Gravel Aquifer Maps
Sand and Gravel Aquifer Maps
http://www.state.me.us/doc/nrimc/mgs/mgs.htm
publication date
1979-01-01
1981-12-31
24000
aqfrs24
aqfrs24
2002-08-20
second
Maine Geological Survey (MGS)
Maine Office of Geographic Information Systems (MEGIS)
Augusta ME
vector digital data
7.5' Quadrangle Open-File Numbe
Significant Aquifers
1:24000 Quadrangle compilers, quadrangle mappers, and Maine Geological Survey Significant Aquifers in 7.5' Quadrangle Open-File numbers for each mapped quadrangle are available in a related table "aq24meta" published in the MEGIS Data Catalog "Tables" link at http://megis.maine.gov/catalog/ .
http://megis.maine.gov/catalog/
publication dates
1998-01-01
2002-08-20
Source mapping for WELLMODS.
24000
bdrkswpa
bdrkswpa
2003-07-01
Maine Office of Geographic Information Systems (MEGIS)
Augusta ME
Maine Department of Human Services (MEDHS), Drinking Water Program
vector digital data
Source Water Protection Area (SWPA)
Public Water Suppy
Bedrock source water protection areas developed by the Maine Geological Survey under an agreement with the Maine Drinking Water Program. Areas are shown as three levels of probability of contributing water to a well: low, moderate, and high, depending on the number of simulations where flow occurred.
http://megis.maine.gov/catalog/
ground condition
2001-08-01
compilation of groundwater modeled contributing areas for the Maine Geological Survey and various consultants for public water systems.
Bedrock source water protection areas in Maine with a high, moderate, or low probability of contributing water to community public water supplies were developed by the The Maine Drinking Water Program (MEDWP), in cooperation with the Maine Geological Survey (MGS). MGS conducted probabilistic digital modeling of the contributing areas to selected bedrock community public water supplies. The models were run using the U.S. Geological Survey finite-difference ground-water flow model MODFLOW and the particle tracking package MODPATH. Available geologic and pump test data formed the primary inputs to the models. A set of structured sensitivity analyses produced a probability plot of capture zones. Each model set was generalized into "high" "moderate" and "low" probability zones of contribution to the well(s). These data were developed with financial support from U.S. Environmental Protection Agency (USEPA). Additional information on MODFLOW and MODPATH and water resource modeling techniques is available at http://water.usgs.gov/nrp/gwsoftware/modflow.html and http://water.usgs.gov/pubs/twri/twri6a1/ .
2001-08-01
(MEDHHSDWP) Maine Department of Health and Human Services, Drinking Water Program
Manager Source Water Protection
(207) 287-6196
State House Station 11
Augusta
ME
04333-0010
US
Most 200 day and 2500 day travel time areas for selected Community Public Water Supply Wells in sand and gravel aquifers were developed using the U.S. Geological Survey finite-difference ground-water flow model MODFLOW and the particle tracking package MODPATH to calculate times of travel. Some were estimated using analytical methods. The Maine Geological Survey (MGS) performed most of the modeling, while consultants for public water suppliers performed the remainder. Details on hydrogeologic delineation, determination of ambient flow direction and rates, hydraulic properties of aquifers and contributing areas are available from MEDWP. Each site was visited, and any geologic exposures assessed. Site visits also served to verify water levels, locations, elevations, and use of wells, and related information. Additional information on MODFLOW and MODPATH and water resource modeling techniques is available at http://water.usgs.gov/nrp/gwsoftware/modflow.html and http://water.usgs.gov/pubs/twri/twri6a1/ .
2002-10-01
(MEDHHSDWP) Maine Department of Health and Human Services, Drinking Water Program
Manager Source Water Protection
(207) 287-6196
State House Station 11
Augusta
ME
04333-0010
US
medwpgps
Data for bedrock source water protection and sand/gravel 200-2500 travel time areas were originally developed in two separate data layers BDRKSWPA and SGTIME. These were recompiled for use in SDE format and to serve the Maine Drinking Water Programs IMS application.
2003-06-01
(MEDHHSDWP) Maine Department of Health and Human Services, Drinking Water Program
Manager Source Water Protection
(207) 287-6196
State House Station 11
Augusta
ME
04333-0010
US
sgtime
bdrkswpa
A public water supply ID (NUMBER0) and a randomly selected source ID for that public water supply (PWS) have been added to the WELLMODS polygons. This allows for some table joins and analysis that previously was not possible. It isn't a perfect reflection of reality, since most of the polygons enclose, and reflect the use of, more than one well. However, the PWSs are correct, and the source ID is correct but may not be complete.
2003-07-01
(MEDHHSDWP) Maine Department of Health and Human Services, Drinking Water Program
Manager Source Water Protection
(207) 287-6196
State House Station 11
Augusta
ME
04333-0010
US
289
GISVIEW.MEDWP.WellModels
polygon feature class
Environmental Systems Research Institute, Inc. (ESRI)
Feature Class
289
OBJECTID
OBJECTID
OID
4
10
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
TYPE
TYPE
SmallInteger
2
5
0
type of polygon based on modelling protocol
MEDWP
1
200 day travel time in sand and gravel
MEDWP
2
2500 day travel time in sand and gravel
MEDWP
3
high probability bedrock contributing area
MEDWP
4
moderate probability bedrock contributing area
MEDWP
GlobalID
GlobalID
GlobalID
38
0
0
Shape
Shape
Geometry
4
0
0
Feature geometry.
Esri
Coordinates defining the features.
Shape.STArea()
Shape.STArea()
Double
0
0
0
Shape.STLength()
Shape.STLength()
Double
0
0
0
The Maine Drinking Water Program maintains an extensive database of information on each public water supply well in Maine. WELLMODS contains bedrock source water protection areas, and sand/gravel aquifer areas with 200-2500 day travel times, that have a probability of contributing water to community public water supplies in Maine. The dataset is attributed with the item TYPE which describes the probability associated with each polygon.
The ArcView shapefile and ArcGIS geodatabase formats, commonly used for Maine GIS data, carry default identifiers and attributes that are software generated and/or important for internal recordkeeping. These are listed here to avoid repetition for every layer, and may not be repeated in the attribute descriptions and definitions of each layer. Common software generated identifiers and attributes in Maine GIS data include: FID (feature identifier), Shape (feature geometry), OBJECTID and SHAPE_lengt. In addition, most GIS formats will carry fields for PERIMETER, AREA and/or LENGTH according to feature geometry. These fields are typically available by default, with the units based on coordinate system or projection units of GIS data. Most GIS software packages also provide a means to calculate these values. It is important to test any columns containing PERIMETER, AREA or LENGTH values before using them for analysis purposes. These important values can be carried from format to format and become out-dated. Verify that the values are correct. Also, in your GIS software, please view the properties of data layers for the map units used to calculate these fields, and for the units set for display purposes.
dataset
EPSG
6.13(3.0.1)
Simple
FALSE
289
TRUE
FALSE