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This map of United States water resource subregion hydrologic units updated boundaries to include the ocean as well as the portions of the basins that cross international borders For the use of hydrologists, ecologists, and water-resource managers in the study of surface water flows in the United States, the United States Geological Survey ...
Watershed delineation is the process of identifying the boundary of a watershed, also referred to as a catchment, drainage basin, or river basin.It is an important step in many areas of environmental science, engineering, and management, for example to study flooding, aquatic habitat, or water pollution.
Oak Leaf is located in northern Ellis County and is bordered to the northwest by Ovilla, to the north by Glenn Heights, and to the east by Red Oak. Waxahachie, the county seat, is 11 miles (18 km) to the south, and downtown Dallas is 20 miles (32 km) to the north.
Watersheds of North America are large drainage basins which drain to separate oceans, seas, gulfs, or endorheic basins. There are six generally recognized hydrological continental divides which divide the continent into seven principal drainage basins spanning three oceans ( Arctic , Atlantic and Pacific ) and one endorheic basin.
Ovilla, on upper Red Oak Creek in northern Ellis County, is the oldest town in the county. It began in 1844 as a fortified settlement known as McNamara's to repel Indian incursions.
Subsequently every watershed along this coast is assigned a number using the Pfafstetter Coding System. This implies that the four largest watersheds are selected and receive numbers 2,4,6, or 8. The watersheds in between the large systems receive numbers 3, 5, and 7. Numbers 1 and 9 are used for the small watersheds on the edges of the strait.
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Development of the community dates back to the late 1960s. N.L. 'Moe' Craddock, a Dallas firefighter, opened a 30-acre (120,000 m 2) mobile home park in the area. He helped push for the incorporation of Glenn Heights to prevent his business from being annexed by the city of DeSoto. [6]
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