Name: Archived Tier II Catchments 2012

Display Field: CATCHMENT

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Description: The Clean Water Act requires three components to water quality standards that set goals for and protect each States' waters. The three components are: (1) designated uses that set goals for each water body (e.g., recreational use), (2) criteria that set the minimum conditions to support the use (e.g., bacterial concentrations below certain concentrations) and (3) an antidegradation policy that maintains high quality waters so they are not allowed to degrade to meet only the minimum standards. The designated uses and criteria set the minimum standards for Tier I. Maryland's antidegradation policy has been promulgated in three regulations: COMAR 26.08.02.04 sets out the policy itself, COMAR 26.08.02.04-1, which is discussed here, provides for implementation of Tier II (high quality waters) of the antidegradation policy, and COMAR 26.08.02.04-2 that describes Tier III (Outstanding National Resource Waters or ONRW), the highest quality waters. No Tier III waters have been designated at this time. Tier II antidegradation implementation has the greatest immediate effect on local government planning functions so MDE has prepared this set of Tier II GIS data layers to provide technical assistance to local governments working to complete the Water Resources Element of their comprehensive plans as required by HB 1141. As part of this process, MDE has created a catchment dataset representing the general land area that can directly affect that Tier II stream's segment water quality via run off. The publicly maintained list of all Tier II waters and for further information regarding Maryland's High Quality Waters, Tier II, please visit http://www.mde.state.md.us/ResearchCenter/Data/waterQualityStandards/Antidegradation/index.aspAcknowledgement of the Maryland Department of the Environment as a data source would be appreciated in products developed from these data, and such acknowledgement as is standard for citation and legal practices for data source is expected by users of this data. Sharing new data layers developed dierctly from these data would also be appreciated by the Maryland Department of the Environment staff. Users should be aware that comparision with other data sets for the same area may be inaccurate due to inconsistencies resulting from changes in mapping conventions, data collection, and computer processes over time. The data set is not a survey document and should not be utilized as such. Data used in the creation of this tool was from many sources are not perfect. The distributor shall not be liable for imporper or incorrect use of this data, based on the description of appropriate/inappropriate uses described in this metadata document. These data are not legal documents and are not to be used as such. Final identification of Tier II waters shall be made based on consulting the regulation COMAR 26.08.02.04-1 and the list of promulgated and pending waters maintained at the website: http://www.mde.state.md.us/ResearchCenter/Data/waterQualityStandards/Antidegradation/index.asp

Copyright Text: MD iMAP, MDE, The Maryland Department of the Environment Science Services Administration would like to acknowledge the Maryland Department of Natural Resources' MANTA Division, Maryland Biological Stream Survey Program for providing biological stream sampling station data as well as the associated geospatial information. MDE would also like to acknowledge the USGS for their 24,000:1 scale National Hydrography Dataset which was used during the development of this line file.

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Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: Feature ID )
• CATCHMENT ( type: esriFieldTypeString, alias: Catchment, length: 50 )
• COUNTY ( type: esriFieldTypeString, alias: County, length: 20 )
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