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Description: For watersheds in the OKI region, the Watersheds Layer serves as a spatial-reference framework for water quality data and other datasets in the Stream Database. Watershed boundaries and Hydrologic Unit Codes (HUCs) were acquired from the Watershed Boundary Dataset (WBD), which delineates surface water drainage areas based on land area and topography. The HUC system provides a tiered approach to classifying and identifying these drainage areas.For its four Ohio counties (Butler, Clermont, Hamilton and Warren) OKI obtained most of the watershed data and water quality assessments from the 2010 Ohio Integrated Water Quality Monitoring and Assessment Report (Ohio Environmental Protection Agency, Division of Surface Water, 2009-10). This includes evaluations of aquatic life uses, recreational uses, public water sources, and human health risks related to fish consumption. For each impaired watershed, the Watersheds Layer notes the status of a Total Maximum Daily Load (TMDL) study, which determines the total maximum daily loads of selected pollutants that can enter an impaired stream without ruining efforts to improve stream health. The layer also notes significant stewardship groups that have been organized to improve water quality in each watershed. OKI’s Stream Database Glossary defines the widely accepted concepts, specialized terms and acronyms associated with watersheds and water quality.
Service Item Id: c35ab2def3874151a1609971ac83bbe3
Copyright Text: OKI staff created this geographic information system layer with data from the Watershed Boundary Dataset, 2010 Ohio Integrated Water Quality Monitoring and Assessment Report, TMDL reports, Watershed Action Plans, and local stewardship organizations.
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Description: A census tract is a small statistical subdivision of a county and is used as part of the Census Bureau, has between 1,2000 and 4,000 people, and covers a contiguous area. These areas are relatively permanent and maintained for a long time for statistical comparisons from census to census. They generally follow visible and identifiable features.
Description: U.S. ZIP Code Areas (Five-Digit) represents five-digit ZIP Code areas used by the U.S. Postal Service to deliver mail more effectively. The first digit of a five-digit ZIP Code divides the United States into 10 large groups of states numbered from 0 in the Northeast to 9 in the far West. Within these areas, each state is divided into an average of 10 smaller geographical areas, identified by the second and third digits. These digits, in conjunction with the first digit, represent a sectional center facility or a mail processing facility area. The fourth and fifth digits identify a post office, station, branch or local delivery area.
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