This dataset represents the ‘nested’ Tier II catchments, or watersheds located within the State of Maryland. Oftentimes multiple designated Tier II streams (with their own individual watersheds) occur within a common, larger watershed. Nested catchments are those watersheds whose surface areas drain to the most downstream Tier II stream segment in a collective watershed area. Based on data collected between 1995-2015, this dataset currently contains information for 139 Tier II catchments. Contact: Angel D. Valdez, Antidegradation Implementation Lead Maryland Department of the Environment, 1800 Washington Blvd, Baltimore, MD 21230 Phone: 410-537-3606 E-Mail: angel.valdez@maryland.gov

The Maryland Department of the Environmental shall not be held liable for improper or incorrect use of the data described and/or contained herein. These data and related graphics, as available for download from the MDE webpage, are not legal documents and are not to be used as such. MDE gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data. The information contained in these data is dynamic and may change over time. It is the responsibility of the data user to use the data appropriately and consistent within the limitations of geospatial data in general and these data in particular. Users should be aware that comparison 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. It is strongly recommended that these data be directly acquired from an MDE source and not indirectly through other sources, which may have altered the data in some way. It is standard for citation and legal purposes for the Maryland Department of the Environment be cited as a data source when products are developed from this dataset.