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This page last updated: 04/09/2007
Metadata created using Minnesota Geographic Metadata Guidelines
| Originator | Minnesota Pollution Control Agency, Division of Environmental Outcomes |
| Abstract | The Metro Model is a regional ground water flow model encompassing the Twin Cities seven-county Metropolitan area. The Metro Model provides the regional flow conditions that serve as the starting point for site-specific models that can be constructed through modification and addition of local detail. The computer model simulates multi-aquifer groundwater flow and is based on a conceptual model that consists of five aquifer layers, four of which represent bedrock units, and one representing a glacial drift aquifer. The Metro Model is actually composed of four separate models. One model simulates flow in Layers 4 and 5 and encompasses the entire Metropolitan area. The remaining three models simulate flow in layers 1, 2, and 3, each for a separate hydrologic province. The three hydrologic provinces in the Metropolitan area are defined by the Minnesota and Mississippi Rivers. The software used is the Multi-Layer Analytic Element Model (MLAEM), based on the analytic element method pioneered by Professor Otto D.L. Strack of the University of Minnesota Civil Engineering Department. Improvements in modeling techniques are incorporated into the effort as they are developed to ensure that the Metro Model provides the best technical tool possible for groundwater management issues. Five aquifer layers are represented in the Metro Model. From the top on down they are: 1.Glacial Drift Aquifer (Layer 1), 2.St. Peter Sandstone (Layer 2), 3.Prairie du Chien-Jordan Aquifer (Layer 3), 4.Franconia-Ironton-Galesville Aquifer (Layer 4), and 5.Mt. Simon-Hinckley Aquifer (Layer 5). The models themselves and the data used to support the models are available, either through the MPCA Metro Model website or on CD. |
| Browse Graphic | none available |
| Time Period of Content Date | 1998 |
| Currentness Reference | Data available as of 1998 was used to create the geology, hydrology, and calibration database layers. |
| Access Constraints | |
| Use Constraints | |
| Distributor Organization | Minnesota Pollution Control Agency |
| Ordering Instructions | All datasets and model documentation are available on the Metro Ground Water Model Data CD, Version 1.0.7 (June, 2001). Because the actual MLAEM model datasets are expected to change periodically, and because they are easily downloaded, they will be available solely from the project website. The most current datasets for the four models can be downloaded from the website. Smaller data sets on this CD can also be downloaded from the website. |
| Online Linkage | Click here to download data. (See Ordering Instructions above for details.) By clicking here, you agree to the notice in "Distribution Liability" in Section 6 of this metadata. |
Go to Section:
1. Identification Information
2. Data Quality Information
3. Spatial Data Organization Information
4. Spatial Reference Information
5. Entity and Attribute Information
6. Distribution Information
7. Metadata Reference Information
| Section 1 | Identification Information | Top of page | ||
| Originator | Minnesota Pollution Control Agency, Division of Environmental Outcomes | |||
| Title | Metropolitan Area Ground Water Model - The Metro Model - and Supporting Data | |||
| Abstract | The Metro Model is a regional ground water flow model encompassing the Twin Cities seven-county Metropolitan area. The Metro Model provides the regional flow conditions that serve as the starting point for site-specific models that can be constructed through modification and addition of local detail. The computer model simulates multi-aquifer groundwater flow and is based on a conceptual model that consists of five aquifer layers, four of which represent bedrock units, and one representing a glacial drift aquifer. The Metro Model is actually composed of four separate models. One model simulates flow in Layers 4 and 5 and encompasses the entire Metropolitan area. The remaining three models simulate flow in layers 1, 2, and 3, each for a separate hydrologic province. The three hydrologic provinces in the Metropolitan area are defined by the Minnesota and Mississippi Rivers. The software used is the Multi-Layer Analytic Element Model (MLAEM), based on the analytic element method pioneered by Professor Otto D.L. Strack of the University of Minnesota Civil Engineering Department. Improvements in modeling techniques are incorporated into the effort as they are developed to ensure that the Metro Model provides the best technical tool possible for groundwater management issues. Five aquifer layers are represented in the Metro Model. From the top on down they are: 1.Glacial Drift Aquifer (Layer 1), 2.St. Peter Sandstone (Layer 2), 3.Prairie du Chien-Jordan Aquifer (Layer 3), 4.Franconia-Ironton-Galesville Aquifer (Layer 4), and 5.Mt. Simon-Hinckley Aquifer (Layer 5). The models themselves and the data used to support the models are available, either through the MPCA Metro Model website or on CD. |
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| Purpose | The original goals were to assemble databases, develop a conceptual model, and build a regional ground water flow model encompassing the Twin Cities seven-county Metropolitan area. A further goal was acceptance and use of the model by the environmental and ground water modeling community. Regional groundwater models covering the glacial drift to the Mt. Simon/Hinckley aquifers are ready for use. The Metro Model provides a platform from which expansion or development of other subregional models may be developed. And by collecting and reviewing the incremental changes made to the Metro Model, improvements can be shared with all participants. Though originally designed with ground water contamination in mind, other uses that the model can be put to include analyzing ground water management issues such as sustainable development of groundwater, and delineating wellhead protection areas. MPCA believes that the project can also provide support to many different types of hydrogeologic investigations, ranging from relatively simple reviews of geology to more complicated drawdown analyses. A large storehouse of shape files, maps and database files, including Twin Cities bedrock coverages, geostatistically filtered calibration datasets, glacial drift sand-content maps, and stream discharge measurements, are available to all interested parties. These databases can also be used to solve hydrogeologic problems that do not require the building of a ground water model. |
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| Time Period of Content Date | 1998 | |||
| Currentness Reference | Data available as of 1998 was used to create the geology, hydrology, and calibration database layers. | |||
| Progress | Complete | |||
| Maintenance and Update Frequency | None planned | |||
| Spatial Extent of Data | 7-County Twin Cities Metropolitan Area, Minnesota | |||
| Bounding Coordinates | -94.012 -92.646 45.734 44.471 |
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| Place Keywords | Twin Cities Metropolitan Area, TCMA, Minnesota, Anoka County, Carver County, Dakota County, Hennepin County, Ramsey County, Scott County, Washington County, Minneapolis, St. Paul | |||
| Theme Keywords | geoscientificInformation, geology, hydrogeology, bedrock geology, bedrock topography, surficial geology, quaternary sand content, hydrogeologic unit characteristics, calibration databases, well data, water level data, ground water contours, glacial drift aquifers, St. Peter Sandstone, Prairie du Chien Group, Jordan Sandstone, Platteville Limestone, Glenwood Shale, St. Lawrence formation, Franconia formation, Ironton Sandstone, Galesville Sandstone, Franconia-Ironton-Galesville aquifer, Eau Claire Formation, Mt. Simon Sandstone, Hinckley Sandstone, Mt. Simon-Hinckley Aquifer, hydrography, rivers, lakes, springs, river valleys, topographic maps, DRG's, digital raster graphics, USGS topographic maps | |||
| Theme Keyword Thesaurus | ISO 19115 Topic Category | |||
| Access Constraints | ||||
| Use Constraints | ||||
| Contact Person Information | Douglas Hansen,
Hydrologist II Minnesota Pollution Control Agency 520 Lafayette Road St. Paul, Minnesota 55155 Phone: (651) 296-9192 FAX: E-mail: douglas.hansen@pca.state.mn.us | |||
| Browse Graphic | none available | |||
| Browse Graphic File Description | ||||
| Associated Data Sets | Data sets developed or compiled for use in the model are available from the MPCA Metro Model website or on CD. |
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| Section 2 | Data Quality Information | Top of full metadata | Top of page | |
| Attribute Accuracy | See individual data set documentation | |||
| Logical Consistency | See individual data set documentation | |||
| Completeness | ||||
| Horizontal Positional Accuracy | See individual data set documentation | |||
| Vertical Positional Accuracy | See individual data set documentation | |||
| Lineage | See individual data set documentation | |||
| Source Scale Denominator | 100000 | |||
| Section 3 | Spatial Data Organization Information | Top of full metadata | Top of page | |
| Native Data Set Environment | Arc/INFO, Microsoft Access, MLAEM Model (.dat) input format | |||
| Geographic Reference for Tabular Data | ||||
| Spatial Object Type | ||||
| Vendor Specific Object Types | ||||
| Tiling Scheme | Twin Cities Metro, applicable USGS 7.5-minute and 100K quads, Hydrologic Provinces (northeast, northwest, south) of TCMA | |||
| Section 4 | Spatial Reference Information | Top of full metadata | Top of page | |
| Horizontal Coordinate Scheme | UTM | |||
| Ellipsoid | GRS80 | |||
| Horizontal Datum | NAD83 | |||
| Horizontal Units | Meters | |||
| Distance Resolution | ||||
| UTM Zone Number | 15 | |||
| Section 5 | Entity and Attribute Information | Top of full metadata | Top of page | |
| Entity and Attribute Overview | The Metro Model is a computer simulation of regional ground water flow in the Twin Cities metropolitan area. It is based on a conceptual model that consists of five aquifer layers, four of which represent bedrock units, and one representing a glacial drift aquifer. The Metro Model is based on a series of supporting databases and maps. These in turn are based on reports of investigations of the area geology, hydrogeology, and surface topography. Many of these data bases, maps, and reports have been developed by and for the Metro Model and are available to interested parties at a special repository available on the Internet. These files are designed to be used with database and geographic information system programs such as ACCESS and ARCVIEW. Over time, more of the datasets, reports, and models will be made available from the Metro Model website. Data sets can also be obtained on CD. Major data layers include the following: DATASETS: 1. GEOLOGY: PALEOZOIC COVERAGES: a. Mossler, J.H. and Tipping, R.G., 1996, Bedrock geologic map of the seven-county metropolitan area: Minnesota Geological Survey, unpublished manuscript maps, scale 1:100,000, one digital file. b. Mossler, J.H. and Tipping, R.G., 1996, Bedrock topographic map of the seven-county metropolitan area, Minnesota Geological Survey, unpublished manuscript map, scale 1:100,000, one digital file. c. Tipping, R.G. and Mossler, J.H., 1996, Digital elevation models for the tops of the St. Peter Sandstone, Prairie du Chien Group, Jordan Sandstone and St. Lawrence Formations within the seven-county metropolitan area: Minnesota Geological Survey, unpublished manuscript maps, scale 1:100,000, four digital files. The bedrock geology data is presented in two ways: 1) combined units, and 2) individual units, from the Jordan Sandstone up to the Decorah Shale. GEOLOGY: QUATERNARY SAND CONTENT. The five files for each province represent different elevation intervals throught the glacial drift horizon. 2. HYDROGEOLOGY: CALIBRATION DATABASES: The calibration datasets were developed from the County Well Index database. The following steps were taken to produce the datasets: 1) CWI sort for UTM wells, 2) ARCVIEW sort to identify hydrologic province, 3) Random selection of up to 1400 wells to develop a variogram based on location and head elevation (except where total number of wells is less than 1400), 4) Random selection of up to 1000 wells to submit to cross-validation to remove outliers (except where total number of wells is less than 1000), 5) Removal of 100 wells with highest absolute value residual of observed head minus estimated head (a product of the cross-validation procedure), This leaves 900 wells for the calibration dataset. Five columns of information are provided: X location (UTM) Y location (UTM) Head (meters) Unique# Aquifer English units for head elevations are also provided in the relevant subdirectory. HYDROGEOLOGY: GROUND WATER CONTOURS FOR THE FIRST LAYER OF THE MODEL: Groundwater contours for the First layer were developed from the variogram and head values of the respective hydrologic province's wells. Contours are provided for: Cont1_ne.shp Northeast province, Layer 1 Cont1_nw.shp Northwest province, Layer 1 Cont1_so.shp Southern province, Layer 1 A grid file was produced in SURFER from which a DXF file was then created. The contour interval is in meters. HYDROGEOLOGY: SPRINGS. This directory contains information and data on springs in the Mississippi River gorge mapped and compiled by Greg Brick as part of his Masters thesis. Under contract with Metro Model project, Greg compiled the data he had collected on each spring into an Excel spreadsheet (springs.xls) that includes a unique code he assigned, the name of the spring, the formation it issues from (and member, if known), the elevation above a formation contact, the elevation above mean sea level, spring discharge, measurement type, and notations. Additionally, he submitted the USGS maps showing the spring locations. Metro Model staff digitized these and placed the data in database and shape file format that is ArcView-ready (springs.dbf, *.sbn, *.sbx, *.shp, & *.shx). 3. MISCELLANEOUS COVERAGES (SHAPEFILES) HYDROGRAPHY: The two shapefiles, streams.shp and water.shp, are surface water expressions digitized from USGS topographic maps by the Minnesota Dept. of Transportation. POLITICAL BOUNDARIES: The political/governmental boundary files include the State of Minnesota (state) , the 7-county metro area with counties (metro), and the outline of the 7-county metro area (outline). RIVER VALLEYS: The river shape files are: minn-r.shp Minnesota river valley miss-up.shp Mississippi above the Minnesota river miss-dn.shp Mississippi below the Minnesota river st_croix.shp St. Croix River Valley The valleys are used because they are the focus of groundwater discharge, not the actual river course within the valley. These coverages were used to construct the layout of the hydrologic provinces used in the model. 4. TOPOGRAPHIC MAPS (DRG): The Topographic maps (DRG) presented here are US Geological Survey products that have been trimmed and edge-matched by the MPCA. Individual 24K map sheets are stored by 100K sheet: Four 100K sheets cover the study area: Anoka, Hastings, St. Paul, and Stillwater 5. HYDROGEOLOGIC UNIT CHARACTERISTICS DATABASE - Currently allows access to information from six references. |
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| Entity and Attribute Detailed Citation | Individual data layer or data set documentation will be posted at the MPCA ftp site as it is completed. | |||
| Section 6 | Distribution Information | Top of full metadata | Top of page | |
| Publisher | Minnesota Pollution Control Agency | |||
| Publication Date | 2001 | |||
| Contact Person Information | Douglas Hansen Hydrologist II Minnesota Pollution Control Agency 520 Lafayette Road St. Paul, Minnesota 55155 Phone: (651) 296-9192 FAX: E-mail: douglas.hansen@pca.state.mn.us |
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| Distributor's Data Set Identifier | gwmodel | |||
| Distribution Liability | ||||
| Transfer Format Name | Arc/Info Export, Arcview shapefile, Access, MLAEM model format (.dat); .pdf map graphics | |||
| Transfer Format Version Number | ||||
| Transfer Size | ||||
| Ordering Instructions | All datasets and model documentation are available on the Metro Ground Water Model Data CD, Version 1.0.7 (June, 2001). Because the actual MLAEM model datasets are expected to change periodically, and because they are easily downloaded, they will be available solely from the project website. The most current datasets for the four models can be downloaded from the website. Smaller data sets on this CD can also be downloaded from the website. | |||
| Online Linkage | Click here to download data. (See Ordering Instructions above for details.) By clicking here, you agree to the notice in "Distribution Liability" above. | |||
| Section 7 | Metadata Reference Information | Top of full metadata | Top of page | |
| Metadata Date | 04/09/2007 | |||
| Contact Person Information | Douglas Hansen,
Hydrologist II Minnesota Pollution Control Agency 520 Lafayette Road St. Paul, Minnesota 55155 Phone: (651) 296-9192 FAX: E-mail: douglas.hansen@pca.state.mn.us |
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| Metadata Standard Name | Minnesota Geographic Metadata Guidelines | |||
| Metadata Standard Version | 1.2 | |||
| Metadata Standard Online Linkage | http://www.lmic.state.mn.us/gc/stds/metadata.htm | |||
This page last updated: 04/09/2007