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This is an interactive map of Valleys and depressions from the continental United States. It shows the locations of features named Valley, Canyon, Hollow, Basin, Gully, Gorge, Pass, Ravine, and Gap. For names and types, hover over the map.
Dec 28, 2021 · A dynamic map showing 3DEP 1-meter DEM availability for the United States and its Territories. This map is created using services from The National Map. Use The National Map Viewer to explore GIS data, see availability of USGS topographic maps, and create your own web map.
The U.S. Geological Survey's Streamer application allows users to explore where their surface water comes from and where it flows to. By clicking on any major stream or river, the user can trace it upstream to its source (s) or downstream to where it joins a larger river or empties into the ocean.
Oct 19, 2024 · Those irrigation ditches, scattered across the state and known as acequias (pronounced ah-SEH-kee-ahs), have endured for hundreds of years. For Maestas and other residents in Albuquerque’s South...
Jul 13, 2021 · According to the data from the Great Dismal Swamp National Wildlife Refuge, there are a total of 266 miles of major canals and ditches today. Of the 266 miles of ditches and canals, 84 miles were built prior to 1940 (blue lines), and after 1940, 146 miles were constructed (red lines).
From as far north as Cape Girardeau to as far south as the Arkansas state line, The Little River Drainage District includes a massive series of levees and ditches to drain a total of 2 million acres. For a detailed view, download the Map of the District.
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By 1884, Ohio had 20,000 miles of public ditches designed to drain 11 million acres of land (Wooten and Jones, 1955). Wetland conversion in the Central Valley of California began in the mid-1800's, when farmers began diking and draining the flood-plain areas of the valley for cultivation (fig. 9).
