Service Description: This data is intended primarily for geographic display and analysis of regional and national data, and can also be used for illustration purposes at intermediate or small scales (1:250,000 to 1:2,000,000). The original dataset was clipped and re-projected for use in the Mohawk River Watershed Management Plan.
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Description: This file contains Hydrologic Unit boundaries and codes for the United States, Puerto Rico, and the U.S. Virgin Islands. The data is a seamless National representation of Hydrologic Unit Code (HUC) boundaries at HUC2 to HUC12 levels compiled from U.S. Geological Survey (USGS) National Hydrography Dataset (NHD) and U.S. Department of Agricultural (USDA) National Resources Conservation Services (NRCS) Watershed Boundary Dataset (WBD) sources. Mohawk River Watershed Processing: The original dataset was processed for use in the Mohawk River Watershed Management Planning Process. All watershed boundaries within Mohawk River Watershed were extracted. The dataset was re-projected to UTM 18N, NAD 83.For the Mohawk River watershed, an assessment framework was developed based on issues and concerns raised by the Watershed Advisory Committee, with the main components being water quality, land use, and habitat. Within these components, specific indicators were selected for evaluation purposes. In total, there are fifteen indicators for the assessment components, and they include the following: Water Quality - % Impairment per WI/PWL, % Groundwater Recharge, % Wetlands & Forest, % Natural Riparian Cover; Land Use - % Agriculture, Soil Erodibility (K-Factor), Livestock/Acre of Pasture, % Forest, % Urban, % Impervious, and % Change in Building Permits since 1990; Habitat - % Aquatic Life Precluded, Impaired or Stressed, % Intolerant Fish Species, In-Stream Habitat Moderate to Severe Observations, Endangered Species Observations.It was determined that the evaluation of sub-watersheds would be done at the 12-digit HUC level, of which there are 116 across the Mohawk River basin. In order to quantify the evaluation and determine a "score" for each sub-watershed, a 1-5 scale was developed for each of the indicators, with the low end of the scale indicating an unhealthy condition and the high end indicating healthy. For example, for % impairment under water quality, the scale is: 1 - >80%, 2 - 60.1-80%, 3 - 40.1-60%, 4 - 20.1-40%, and 5 - <20%. The indicator scores are added up to get the total score for each sub-watershed, with low scores showing the need for restoration and high scores the need for protection. And, with the power of GIS, all of this can be done automatically, with map layers created showing sub-watersheds scoring high, medium, and low for total score, or for the scores of each of the three components.
Copyright Text: Original data from the USGS Water Resources Division (WRD), NHD, and the USDA NRCS Watershed Boundary Dataset (WBD) . Other updates contributed by U.S. Environmental Protection Agency (EPA), U.S. Forest Service and USGS NHD program data compilers as well as various State, Regional and Local agencies.
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