DRASTIC Results 2019

Enterprise Geodatabase Feature Class

Tags
DRASTIC; Groundwater; Ground Water; Water Quality; North Dakota

Description

The DRASTIC model was developed by the US EPA as a way of quantifying an aquifer’s susceptibility to surface contamination events. In 1997, the NDDoH Environmental Health Section, now the Department of Environmental Quality, applied this system to North Dakota’s shallow aquifers as part of the North Dakota Geographic Targeting System for Groundwater Monitoring (GTS). In 2015, it was decided to update the GTS to reflect changes in aquifer boundaries, water use and land use. The complete report was finalized in October 2019 and is available online here . (URL https://deq.nd.gov/publications/wq/1_GW/GeoTargetSys/2018_GTS/2019_GTS_Report_October2019.pdf). The DRASTIC model was reapplied to all known shallow groundwater resources within North Dakota in order to obtain the Vulnerability rating shown in the Attachment on page 32 of the report.

The DRASTIC model consists of seven weighted factors:

1. Depth to Water (feet below ground surface)

2. Net Recharge (inches per year)

3. Aquifer Media (sand and gravel, clay, silt, etc.)

4. Soil Media (Loam, Silty Loam, Sand, etc.)

5. Topography (Percent Slope)

6. Impact of the Vadose Zone (Silt/Clay, Confining Layer, etc.)

7. Hydraulic Conductivity (cubic feet per year)

Each factor has two associated fields. These fields represent the actual unit value of the factor, and the second field represents the score* assigned to the factor. A score is a rating based on a scale of values, used along with a weighting factor to generate a final DRASTIC score.

The final two fields, DRASTIC and P_DRASTIC represent two methods of rating aquifers. The DRASTIC value is a general assessment of contamination susceptibility, while the P_DRASTIC represents a score adjusted to better represent susceptibility to pesticide use contamination.

*This is generally referred to as a “Rating” in the DRASTIC methodology but has been changed here to remain consistent with the GTS methods of differentiating between values, scores, and ratings. See North Dakota Geographic Targeting System for Groundwater Monitoring report for additional information.

*In December of 2018, an additional assessment was conducted on the water levels of confined aquifers to account for hydrostatic pressure, primarily addressing the Spiritwood Aquifer System. These changes are reflected in the October 2019 updated GTS report.


Summary

This layer shows the results of the 2019 DRASTIC analysis of North Dakota aquifers, which represents the 'Vulnerability' component of the GTS.  This map can also be found in Attachment 3 of the "North Dakota Geographic Targeting System For Groundwater Monitoring" report, dated October, 2019

Credits

Aller, Linda, Truman Bennett, Jay H. Lehr, and Rebecca J. Petty. DRASTIC: A Standardized System for Evaluating Ground Water Pollution Potential Using Hydrogeologic Settings. Chicago: U.S. Environmental Protection Agency, 1985. Print.

North Dakota State Water Commission.

Radig, Scott. North Dakota Geographic Targeting System for Groundwater Monitoring.Bismarck: U.S. North Dakota Department of Health, 1997. Print.

Authors: Derek Kannenberg, Casey Gleich, Andrew Peterson, North Dakota Department of Health - Division of Water Quality, Groundwater Protection Program.  (Now ND Department of Environmental Quality)

Use limitations

This data is provided by the North Dakota Department of Environmental Quality for your convenience. This data is intended to be used at scales at which it was produced. This service is provided "AS IS" and without warranty of any kind, either expressed or implied. No warranty, either expressed or implied, is made regarding the accuracy or utility of the data or information presented at this site. The North Dakota Department of Environmental Quality is not responsible for any errors or damages that may occur resulting from the use or misuse of the data that is provided at this site.

Metadata 

Topics and Keywords 

Themes or categories of the resource  environment, inlandWaters


*Content type  Downloadable Data

Citation 

Title DRASTIC Results 2019
Publication date 2019-10-23 00:00:00


Edition 2.0


Presentation formats* digital map


Citation Contacts 

Responsible party
Individual's name Ann Fritz
Organization's name North Dakota Department of Environmental Quality
Contact's role  owner


Contact information
Address
Type both
Delivery point 918 E. Divide Ave
City Bismarck
Administrative area ND
Postal code 58501
Country US
e-mail addressafritz@nd.gov



Resource Details 

Dataset languages* English (UNITED STATES)


Spatial representation type* vector


*Processing environment Microsoft Windows 10 Version 10.0 (Build 17134) ; Esri ArcGIS 12.5.0.22081


Credits
Aller, Linda, Truman Bennett, Jay H. Lehr, and Rebecca J. Petty. DRASTIC: A Standardized System for Evaluating Ground Water Pollution Potential Using Hydrogeologic Settings. Chicago: U.S. Environmental Protection Agency, 1985. Print.

North Dakota State Water Commission.

Radig, Scott. North Dakota Geographic Targeting System for Groundwater Monitoring.Bismarck: U.S. North Dakota Department of Health, 1997. Print.

Authors: Derek Kannenberg, Casey Gleich, Andrew Peterson, North Dakota Department of Health - Division of Water Quality, Groundwater Protection Program.  (Now ND Department of Environmental Quality)


Extents 

Extent
Geographic extent
Bounding rectangle
Extent type  Extent used for searching
*West longitude -104.048894
*East longitude -96.571223
*North latitude 48.999691
*South latitude 45.934982
*Extent contains the resource Yes

Extent in the item's coordinate system
*West longitude -104.048894
*East longitude -96.571223
*South latitude 45.934982
*North latitude 48.999691
*Extent contains the resource Yes

Resource Constraints 

Constraints
Limitations of use

This data is provided by the North Dakota Department of Environmental Quality for your convenience. This data is intended to be used at scales at which it was produced. This service is provided "AS IS" and without warranty of any kind, either expressed or implied. No warranty, either expressed or implied, is made regarding the accuracy or utility of the data or information presented at this site. The North Dakota Department of Environmental Quality is not responsible for any errors or damages that may occur resulting from the use or misuse of the data that is provided at this site.


Spatial Reference 

ArcGIS coordinate system
*Type Geographic
*Geographic coordinate reference GCS_North_American_1983
*Coordinate reference details
Geographic coordinate system
Well-known identifier 4269
X origin -400
Y origin -400
XY scale 999999999.99999988
Z origin 0
Z scale 1
M origin 0
M scale 1
XY tolerance 8.98315284119521e-09
Z tolerance 0.001
M tolerance 0.001
High precision true
Left longitude -180
Latest well-known identifier 4269
Well-known text 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], AUTHORITY["EPSG", 4269]]

Reference system identifier
*Value 4269
*Codespace EPSG
*Version 9.8(3.0.1)


Spatial Data Properties 

Scale Range

Maximum (zoomed in)  1:5,000
Minimum (zoomed out)  1:150,000,000
Vector
*Level of topology for this dataset  geometry only


Geometric objects
Feature class name hub.DBO.DRASTIC
*Object type  composite
*Object count 0



ArcGIS Feature Class Properties
Feature class name hub.DBO.DRASTIC
*Feature type Simple
*Geometry type Polygon
*Has topology FALSE
*Feature count 0
*Spatial index TRUE
*Linear referencing FALSE



Distribution 

Distribution format
*Name Enterprise Geodatabase Feature Class


Fields 

Details for object hub.DBO.DRASTIC 
*Type Feature Class
*Row count 0


Field OBJECTID
 
*Alias OBJECTID
*Data type OID
*Width 4
*Precision 10
*Scale 0
*Field description
Internal feature number.

*Description source
Esri

*Description of values
Sequential unique whole numbers that are automatically generated.





Field AQUIFER
 
*Alias Aquifer Name
*Data type String
*Width 1073741822
*Precision 0
*Scale 0




Field D_SCORE
 
*Alias DRASTIC Score
*Data type Integer
*Width 4
*Precision 10
*Scale 0




Field D_RATING
 
*Alias DRASTIC Rating
*Data type String
*Width 1073741822
*Precision 0
*Scale 0




Field PD_SCORE
 
*Alias Pesticide DRASTIC Score
*Data type Integer
*Width 4
*Precision 10
*Scale 0




Field PD_RATING
 
*Alias Pesticide DRASTIC Rating
*Data type String
*Width 1073741822
*Precision 0
*Scale 0




Field DTW
 
*Alias Depth To Water
*Data type Double
*Width 8
*Precision 38
*Scale 8




Field DTW_SCORE
 
*Alias Depth to Water Score
*Data type Integer
*Width 4
*Precision 10
*Scale 0




Field DTW_RATING
 
*Alias Depth to Water Rating
*Data type String
*Width 1073741822
*Precision 0
*Scale 0




Field RECHARGE
 
*Alias Recharge
*Data type Integer
*Width 4
*Precision 10
*Scale 0




Field RECHARGE_SCORE
 
*Alias Recharge Score
*Data type Integer
*Width 4
*Precision 10
*Scale 0




Field RECHARGE_RATING
 
*Alias Recharge Rating
*Data type String
*Width 1073741822
*Precision 0
*Scale 0




Field AQ_MATERIAL
 
*Alias Aquifer Medium
*Data type String
*Width 1073741822
*Precision 0
*Scale 0




Field AQ_MAT_SCORE
 
*Alias Aquifer Medium Score
*Data type Integer
*Width 4
*Precision 10
*Scale 0




Field AQ_MAT_RATING
 
*Alias Aquifer Medium Rating
*Data type String
*Width 1073741822
*Precision 0
*Scale 0




Field SOILTEXTURE
 
*Alias Soil Texture
*Data type String
*Width 1073741822
*Precision 0
*Scale 0




Field SOILTEXTURE_SCORE
 
*Alias Soil Texture Score
*Data type Integer
*Width 4
*Precision 10
*Scale 0




Field SOILTEXTURE_RATING
 
*Alias Soil Texture Rating
*Data type String
*Width 1073741822
*Precision 0
*Scale 0




Field TOPO
 
*Alias Topography
*Data type Integer
*Width 4
*Precision 10
*Scale 0




Field TOPO_SCORE
 
*Alias Topography Score
*Data type Integer
*Width 4
*Precision 10
*Scale 0




Field TOPO_RATING
 
*Alias Topography Rating
*Data type String
*Width 1073741822
*Precision 0
*Scale 0




Field VZONE_MATERIAL
 
*Alias Vadose Zone Medium
*Data type String
*Width 1073741822
*Precision 0
*Scale 0




Field VZONE_SCORE
 
*Alias Vadose Zone Medium Score
*Data type Integer
*Width 4
*Precision 10
*Scale 0




Field VZONE_RATING
 
*Alias Vadose Zone Medium Rating
*Data type String
*Width 1073741822
*Precision 0
*Scale 0




Field HC
 
*Alias Hydraulic Conductivity
*Data type Double
*Width 8
*Precision 38
*Scale 8




Field HC_SCORE
 
*Alias HydrCond Score
*Data type Integer
*Width 4
*Precision 10
*Scale 0




Field HC_RATING
 
*Alias HydrCond Rating
*Data type String
*Width 1073741822
*Precision 0
*Scale 0




Field Shape
 
*Alias Shape
*Data type Geometry
*Width 8
*Precision 0
*Scale 0
*Field description
Feature geometry.

*Description source
Esri

*Description of values
Coordinates defining the features.





Field Shape.STArea()
 
*Alias Shape.STArea()
*Data type Double
*Width 0
*Precision 0
*Scale 0




Field Shape.STLength()
 
*Alias Shape.STLength()
*Data type Double
*Width 0
*Precision 0
*Scale 0






Metadata Details 

*Metadata language English (UNITED STATES)
Metadata character set  utf8 - 8 bit UCS Transfer Format


Scope of the data described by the metadata* dataset
Scope name* dataset


*Last update 2020-02-19


ArcGIS metadata properties
Metadata format ArcGIS 1.0
Standard or profile used to edit metadata FGDC


Created in ArcGIS for the item 2019-01-11 13:42:45
Last modified in ArcGIS for the item 2020-02-19 09:50:20


Automatic updates
Have been performed Yes
Last update 2020-02-19 09:50:20


Metadata Contacts 

Metadata contact
Individual's name Ann Fritz
Organization's name North Dakota Department of Environmental Quality
Contact's role  owner


Contact information
Address
Type both
Delivery point 918 E. Divide Ave
City Bismarck
Administrative area ND
Postal code 58501
Country US
e-mail addressafritz@nd.gov



Metadata Maintenance 

Maintenance
Update frequency  as needed