Skip Maine state header navigation
SDE Feature Class
Tags
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
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).
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/ .
Dataset developed by Maine Drinking Water Program, with logistical and financial support from USEPA.
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
Extent
| West | -71.090831 | East | -66.908948 |
| North | 47.319393 | South | 43.229013 |
| Maximum (zoomed in) | 1:24,000 |
| Minimum (zoomed out) | 1:500,000 |
Dataset developed by Maine Drinking Water Program, with logistical and financial support from USEPA.
ground condition
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.
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
ground condition
source dates
ground condition
publication date
publication dates
ground condition
polygon feature class
Environmental Systems Research Institute, Inc. (ESRI)
Internal feature number.
Esri
Feature geometry.
Esri
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.