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This layer includes data for the dams that are located within the ETJ (Extraterritorial Jurisdiction) of the City of Round Rock, located in Williamson County, Texas. This layer is part of an original dataset provided and maintained by the City of Round Rock GIS/IT Department. The data in this layer are represented as points.<\/SPAN><\/P>

<\/P>

A dam is defined as a barrier that is designed and constructed to both hold back water and raise its level, which in turn forms a reservoir that can be used to generate electricity, or as a water supply. <\/SPAN><\/P>

<\/P>

The City of Round Rock contains 24 dams, as represented in this layer. 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<\/P>

A high water mark is defined as the level at which water will reach at its highest point, such as a sea at high tide. The purpose of a high water mark is to show how high the water level in a particular body of water, such as a river, is able to rise given certain conditions. <\/SPAN><\/P>

<\/P>

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This layer contains the data for the Centerline 1 Percent Ultimate Floodplain in the City of Round Rock, located in Williamson County, Texas. This layer is part of an original dataset provided and maintained by the City of Round Rock GIS/IT Department. The data in this layer are represented as lines.<\/SPAN><\/P>

<\/P>

This layer reduces streams in the City of Round Rock to segments which are able to drain a minimum of 50 acres. They are partitioned at confluences, and are re-aligned to 2008 2 foot contours. <\/SPAN><\/P>

<\/P>

There are 406 segments in this layer, with defined lengths and names. 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<\/P>

A drainage basin is defined as being any area of land where water in the form of precipitation collects and drains off into a common outlet. Common outlets for drainage include rivers, streams, bays, or other bodies of water. <\/SPAN><\/P>

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This layer contains data for the major watershed in and around the City of Round Rock, located in Williamson County, Texas. This layer is part of an original dataset provided and maintained by the City of Round Rock GIS/IT Department. The data in this layer are represented as polygons. <\/SPAN><\/P>

<\/P>

A watershed is defined as an area or ridge of land that separates waters flowing to different rivers, basins, or seas. <\/SPAN><\/P>

<\/P>

The City of Round Rock contains 12 distinct major watersheds, each uniquely named for the river or creek with which it is associated. 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