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GCS_North_American_1983
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NAD_1983_UTM_Zone_15N
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ItemDescription
James Lundy
Minnesota Department of Health
Hydrologist Supervisior
625 Robert Street North
Saint Paul
Minnesota
55164-0975
james.lundy@state.mn.us
US
651-201-4649
James Lundy
ESRI raster
http://www.health.state.mn.us/divs/eh/water/swp/maps/index.htm
Raster Dataset
Hydrogeologic Sensitivity of the Water Table Aquifer
Minnesota Department of Health, Environmental Health, Drinking Water Protection
625 Robert Street North
Saint Paul
Minnesota
55164-0975
james.lundy@state.mn.us
US
651-201-4649
James Lundy
James Lundy
James Lundy
Minnesota Department of Health
Hydrologist Supervisior
625 Robert Street North
Saint Paul
Minnesota
55164-0975
james.lundy@state.mn.us
US
651-201-4649
James Lundy
James Lundy
2016-02-22T00:00:00
Hydrogeologic sensitivity is defined as the likelihood that an aquifer will remain isolated from contaminants due to intrinsic
physical attributes of the geologic setting or geomorphology.
<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>Minnesota Department of Health (MDH) Source Water Protection initially developed county-scale nitrate risk maps in 2007 for nine southeastern Minnesota counties to assist with state and local water quality planning efforts and support a nitrate occurrence study (Southeast Minnesota Water Resources Board, 2009). Hydrogeologic sensitivity mapping was done as part of the nitrate risk mapping effort.</SPAN></SPAN></P><P><SPAN>Hydrogeologic sensitivity of the water table aquifer was generated using guidelines provided in Minnesota DNR (1991). Areas were ranked as low, moderate, high, or very high hydrogeologic sensitivity based on permeability of near-surface bedrock or unconsolidated geologic materials, estimated depth to water, and land slope. </SPAN></P><P><SPAN>LOW (1 point) was assigned to areas 1) covered by geologic materials primarily composed of clay or shale close to the surface, or 2) where land slopes were greater than 12% (regardless of underlying geologic materials).</SPAN></P><P><SPAN>MODERATE (2 points) was assigned to areas not already assigned LOW, and underlain by modified clay till (clay plus a significant sand or gravel fraction). MODERATE was also assigned where land slopes were at least 6% and at most 12% (regardless of the rank of underlying geologic materials, except that material already ranked LOW remained LOW).</SPAN></P><P><SPAN>HIGH (3 points) was assigned to areas not already assigned LOW or MODERATE, and underlain by unconsolidated sands and gravels. HIGH was also assigned to areas where limestone, dolomite, or sandstone were close to the surface and covered by loess.</SPAN></P><P><SPAN>VERY HIGH (4 points) was assigned to areas not already assigned LOW, MODERATE or HIGH, where loess was absent, and shallow bedrock was limestone, dolomite, or sandstone.</SPAN></P></DIV></DIV></DIV>
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The maps are designed to be used at a scale of approximately 1:100,000 (county-scale). Map accuracy at larger scales (more detail or smaller area) cannot be verified due to the scale limitations on the base data used to generate the maps.</SPAN></P><P /></DIV></DIV></DIV>
Base data from National Agricultural Statistics Service, various county soil atlases, Minnesota Geological Survey's County Well Index, and MDH Environmental Health Division, Drinking Water Protection Section, Source Water Protection Unit. Final datasets prepared by MDH Source Water Protection Unit.
Hydrogeologic
Geology
Hydrology
Sensitivity
Version 6.2 (Build 9200) ; Esri ArcGIS 10.4.0.5524
1
-96.502244
-90.435480
47.263404
43.452479
<DIV STYLE="text-align:Left;"><P><SPAN><SPAN>The maps are designed to be used at a scale of approximately </SPAN></SPAN><SPAN STYLE="font-weight:bold;"><SPAN>1:100,000 </SPAN></SPAN><SPAN>(county-scale). Map accuracy at larger scales (more detail or smaller area) cannot be verified due to the scale limitations on the base data used to generate the maps.</SPAN></P></DIV>
8202
56.000000
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2
1
0
234796.732277 4816283.942936
234796.732277 5234435.942936
694108.732277 5234435.942936
694108.732277 4816283.942936
464452.732277 5025359.942936
hg_sensNew
9.000000
1.000000
8
hg_sens.vat
Table
5
Rowid
Rowid
OID
4
0
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
VALUE
VALUE
Integer
4
0
0
The VALUE field numerically classifies the hydrogelogic sensitivity as 1 (low), 2 (moderate), 3 (high), 4 (very high), or 9 (not evaluated)
1
Low hydrogeologic sensitivity
Minnesota Department of Health
2
Moderate hydrogeologic sensitivity
Minnesota Department of Health
3
High hydrogeologic sensitivity
Minnesota Department of Health
4
Very High hydrogeologic sensitivity
Minnesota Department of Health
9
Not Evaluated
Minnesota Department of Health
COUNT
COUNT
Integer
4
0
0
SENSITIVITY
SENSITIVITY
String
25
0
0
Classifies the hydrogeologic sensitivity based on permeability of near-surface geologic materials, whether the water table occurred in bedrock or unconsolidated materials, and land slope.
Minnesota Department of Health
Low
Low hydrogeologic sensitivity
Minnesota Department of Health
Moderate
Moderate hydrogeologic sensitivity
Minnesota Department of Health
High
High hydrogeologic sensitivity
Minnesota Department of Health
Very High
Very High hydrogeologic sensitivity
Minnesota Department of Health
Not Evaluated
Insufficient information to evaluate the hydrogeologic sensitivity
Minnesota Department of Health
dataset
EPSG
6.13(3.0.1)
Pixel
7467
8202
56.000000
56.000000
8
1
Upper Left
TRUE
LZ77
1
pixel codes
SDR
TRUE
row and column
56.000000
56.000000
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