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789.1 cu ft/s (22.34 m 3 /s), USGS water years 2015-2019 [3] Map of Olentangy River highlighted within the Scioto River watershed The Olentangy River / oʊ l ən ˈ t æ n dʒ i / is a 97-mile-long (156 km) [ 5 ] tributary of the Scioto River in Ohio , United States.
The first routine measurements of river flow in England began on the Thames and Lea in the 1880s, [2] and in Scotland on the River Garry in 1913. [3] The national gauging station network was established in its current form by the early 1970s and consists of approximately 1500 flow measurement stations supplemented by a variable number of temporary monitoring sites. [2]
All rivers with average discharge more than 15,000 cubic feet per second are listed. Estimates are approximate, because data are variable with time period measured and also because many rivers lack a gauging station near their point of outflow.
The USGS stream gauge on Raccoon Creek at Adamsville recorded a mean annual discharge of 651.2 cubic feet per second (18.44 m 3 /s) during water years 1916–2019. [5] The gauge on Little Raccoon Creek at Ewington recorded a mean annual discharge of 120.1 cubic feet per second (3.40 m 3 /s) during water years 1999–2019.
They wade into the stream to make the measurement or do so from a boat, bridge, or cableway over the stream. For each gaging station, a relation between gage height and streamflow is determined by simultaneous measurements of gage height and streamflow over the natural range of flows (from very low flows to floods).
In hydrology, discharge is the volumetric flow rate (volume per time, in units of m 3 /h or ft 3 /h) of a stream. It equals the product of average flow velocity (with dimension of length per time, in m/h or ft/h) and the cross-sectional area (in m 2 or ft 2 ). [ 1 ]
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It is headquartered in Reston, Virginia, with major offices near Lakewood, Colorado; at the Denver Federal Center; and in NASA Ames Research Park in California. [3] In 2009, it employed about 8,670 people. [4] The current motto of the USGS, in use since August 1997, is "science for a changing world".