This is a Non-Federal dataset covered by different Terms of Use than Data.gov.

Environmental Monitoring, Water Quality - TMDL Lakes

Metadata Updated: August 19, 2017

The Clean Water Act Section 303(d) establishes the Total Maximum Daily Load (TMDL) program. The purpose of the TMDL program is to identify sources of pollution and allocate pollutant loads in places where water quality goals are not being achieved. This layer shows the list of waters for which technology-based or other required pollution controls are not stringent enough to meet water quality standards. The TMDLs themselves specify a pollutant budget that must be achieved to meet state water quality standards and allocates pollutant loads among pollution sources in a watershed, e.g., point and nonpoint sources. This layer represents lakes with TMDL associated with them. Lakes have characteristics that differentiate TMDLs from other waters. Lakes are not free-flowing like streams, but are contained waters that trap pollutants for long periods. Most lake impairments are from high nutrient or sediment loads. Wherever possible, lake TMDLs are developed with the information in the lake study reports that were sponsored by local watershed groups or other local interests. Target acceptable pollutant loads are set at the level of a watershed largely unaffected by human induced impacts. Load allocations are given to the pollutant sources using the same methods as nonpoint source TMDLs. Other indicators of water quality are also considered in the evaluation of a lake. One indicator is the Trophic Status Index (TSI), which refers to the degree of nutrient enrichment in the lake. Nutrient enrichment causes growths of algae that consume oxygen and interfere with the health of the aquatic organisms in the lake. The TSI is affected by factors such as lake volume, water residence time and nutrient loads to the lake. After target loads are set, the TSI is evaluated under reduced nutrient load conditions to assure that the pollutant reductions will bring the TSI into an acceptable range. Implementation of lake TMDLs is best accomplished though local participation. This layer is based on the High Resolution National Hydrography Dataset (NHD).

Access & Use Information

Non-Federal: This dataset is covered by different Terms of Use than Data.gov. License: No license information was provided.

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Dates

Metadata Date February 24, 2017
Metadata Created Date August 19, 2017
Metadata Updated Date August 19, 2017
Reference Date(s) January 1, 2017 (publication)
Frequency Of Update continual

Metadata Source

Harvested from NSGIC GIS Education HS

Additional Metadata

Resource Type Dataset
Metadata Date February 24, 2017
Metadata Created Date August 19, 2017
Metadata Updated Date August 19, 2017
Reference Date(s) January 1, 2017 (publication)
Responsible Party Pennsylvania State University (PSU) (Point of Contact)
Contact Email
Access Constraints Use Constraints: Commonwealth of Pennsylvania Department of Environmental Protection Disclaimer for Data The user shall save the Commonwealth harmless from any suits, claims, or actions arising out of the use of the data files or accompanying documentation, or arising out of any defects in the datafiles or accompanying documentation. The Commonwealth excludes any and all implied warranties and makes no warranty or representation with respect to the data files or accompanying documentation, including quality, performance, merchantability, or fits for a particular purpose. These data files and documentation are provided "as is" and the user assumes the entire risk as to their quality and performance., Access Constraints: None
Bbox East Long -74.69003296
Bbox North Lat 42.26787567
Bbox South Lat 39.71942902
Bbox West Long -80.51956177
Coupled Resource
Frequency Of Update continual
Guid
Harvest Object Id 1b53a94e-4175-4c34-945e-f1c41c7fe8fc
Harvest Source Id 73925a6e-dd21-4a7d-bfd9-921c79ed7f4b
Harvest Source Title NSGIC GIS Education HS
Licence Although these data have been processed successfully on a computer system by the data steward, no warranty either expressed or implied is made regarding the utility of the data on any system, nor shall this notice generated by the NSGIC GIS Inventory System or the act of distribution constitute any such warranty. The data steward may have additional liability information associated with delivery or distribution of this product.
Metadata Language
Metadata Type geospatial
Progress completed
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True

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