watershed

Definitions

  • WordNet 3.6
    • n watershed an event marking a unique or important historical change of course or one on which important developments depend "the agreement was a watershed in the history of both nations"
    • n watershed the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet "flood control in the Missouri basin"
    • n watershed a ridge of land that separates two adjacent river systems
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Webster's Revised Unabridged Dictionary
    • Watershed a point in time marking an important transition between two situations, or phases of an activity; a turning point.
    • Watershed The line of division between two adjacent rivers or lakes with respect to the flow of water by natural channels into them; the natural boundary of a basin; -- called also divide and water parting.
    • Watershed The whole region or extent of country which contributes to the supply of a river or lake.
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Century Dictionary and Cyclopedia
    • n watershed The area drained by a river and all its tributaries.
    • n watershed The edge of a river-basin (see river); the line separating the waters flowing into two different rivers or river-basins. Thus, the crest of the Sierra Nevada of California forms the watershed between the rivers flowing into the Pacific and those which lose themselves in the Great Basin. Sometimes called the water-parting, and in the United States more frequently and popularly the divide. Thus, the “Continental Divide” is the line which marks the separation of the waters flowing into the Pacific from those finding their way to the Gulf of Mexico.
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Chambers's Twentieth Century Dictionary
    • Watershed the line which separates two river-basins: a district from which several rivers rise
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Idioms

After the watershed - The watershed is the time limit after which more controversial subjects, bad language, etc, can be shown on TV in some countries, so if it's after the watershed, then discussions can be freer, franker and more controversial.
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Etymology

Webster's Revised Unabridged Dictionary
Cf. G. wasserscheide,; wasser, water + scheide, a place where two things separate, fr. scheiden, to separate
Chambers's Twentieth Century Dictionary
A.S. wæter; Dut. water, Ger. wasser; Gr. hydōr, L. udus, wet, unda, a wave, Sans. udan, water.

Usage

In literature:

Later in the day they passed the long, gradual climb over the height of land separating the great watersheds of the Miwasa and the Spirit.
"Two on the Trail" by Hulbert Footner
Wilkes, in fact, seemed to be a watershed in early politics.
"Robert Toombs" by Pleasant A. Stovall
For indeed her convictions like most of our convictions kept along a tortuous watershed between these two.
"The Wife of Sir Isaac Harman" by H. G. (Herbert George) Wells
Some nonsense about watersheds.
"Expediter" by Dallas McCord Reynolds
And here is the touchstone and the watershed of principles.
"The History of Freedom" by John Emerich Edward Dalberg-Acton
We have now arrived at what we might call the watershed of the Acts of the Apostles.
"Bible Studies in the Life of Paul" by Henry T. Sell
It is the watershed of this whole mountain region.
"Our Southern Highlanders" by Horace Kephart
Hillsides are renewed; winds are kept off; our watersheds are protected, and rivers and streams kept full, and the land fertile.
"Woman's Club Work and Programs" by Caroline French Benton
Fitzpatrick spoke of it, though, when the chief and his companion were mounting for the watershed ride.
"The King of Arcadia" by Francis Lynde
France, forming the southern and eastern fringe of the central plateau and part of the watershed between the Atlantic and Mediterranean basins.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7" by Various
Therefore a deep basin was left, which is kept filled by the watershed furnished by the surrounding hills.
"Nature's Miracles, Volume 1" by Elisha Gray
Don't you see that we have crossed the watershed?
"Real Gold" by George Manville Fenn
On the watershed between the valley of the St. Lawrence and Hudson's Bay, marten are prime on the first of October.
"Canadian Wilds" by Martin Hunter
The point he had emphasized most strongly was that Jeremy Walrond stood at the watershed of history.
"Caribbee" by Thomas Hoover
It stands as a watershed between the modification of Chinese styles and the maturity of Japanese Zen art.
"Zen Culture" by Thomas Hoover
The master Hui-neng stands at the watershed of Zen history.
"The Zen Experience" by Thomas Hoover
Whitney's eyes were watering and his hands numb as they crossed the high watershed.
"Johnstone of the Border" by Harold Bindloss
The effect of land-use on streams is closely related to its effect on the flora of the watershed.
"Fishes of Chautauqua, Cowley and Elk Counties, Kansas" by Artie L. Metcalf
Mr. Bull had asked Nixon to define a watershed.
"The Lighter Side of School Life" by Ian Hay
It is in Morocco that the central range of the Atlas Mountains forms a watershed.
"The World and Its People: Book VII" by Anna B. Badlam
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In poetry:

Who are the people of this unscaled heaven?
What beckons?
Whose blood hallows this grim land?
What slithers along the watershed of my human sleep?
"The Naked Land" by Kenneth Patchen

In news:

Efforts to reduce soil loss in west central Iowa's Raccoon River watershed appear to be working.
In support of Squaw Creek watershed.
Thanks to TED35 for alerting me to a watershed moment in human history.
The Thornapple River Watershed Council, based in Caledonia, has scheduled the 17th annual River Clean-Up Day for Saturday, Sept 15.
Tour included 13 stops at various locations throughout the watershed.
Water quality in the Illinois River watershed got worse throughout the 1990s, a state official testified Tuesday in Tulsa federal court.
The annual meeting of the Skaneateles Lake Watershed Agricultural Program is today (Dec 11) at the Skaneateles Presbyterian Church.
Westport Watershed Alliance study seeks source of West Branch pollution.
Environmental and watershed leaders joined Illinois Lt Gov.
Lord McAlpine's lawyers are targeting those who used the social media site Twitter to spread false allegations about him, in a move that could be a watershed moment for those who tweet.
Coast Guard investigations help watershed projects flourish.
Mark your calendars now and plan to attend the Nashua River Watershed Association's guided walks this November.
Did you also know that the Swan Creek Watershed is in need of restoration.
Philip Klein argues that the Todd Akin affair could mark a "watershed moment" for the conservative movement.
Wimberley Valley Watershed Association Jacob's Well.
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In science:

In 1998 the Super-Kamiokande experiment published a paper which represents a watershed in the history of neutrino physics.
Neutrino Mass
There has been an abundance of experimental results on charm meson mixing recently, following the watershed announcements by the BABAR and Belle collaborations that they had independently seen evidence for it at the level of three standard deviations (σ) [1, 2].
Recent charm mixing results from BABAR, Belle, and CDF
In 1998, the Super-Kamiokande experiment published a paper which represents a watershed in the history of neutrino physics.
Neutrino Mass and Mixing with Discrete Symmetry
Barros et al. (2012) assessed the existence of preferential fire perimeter orientation at watershed level to support the spatial layout of fuelbreak networks.
A test for assessing independence between wildfire orientation and size
This analysis identified clusters of watersheds where fire perimeters are preferentially aligned along the NE/SW and the SE/NW axes.
A test for assessing independence between wildfire orientation and size
Each fire perimeter is associated with the watershed that contains its centroid.
A test for assessing independence between wildfire orientation and size
The center map represents the mean slope of the fires of each watershed, where the slope is measured in degrees (0◦ aims for plain slope and 90◦ for a vertical one).
A test for assessing independence between wildfire orientation and size
Finally, the right map shows watersheds where fires display preferential alignment according to Barros et al. (2012).
A test for assessing independence between wildfire orientation and size
Minimum watershed size was interactively increased so that each watershed contained a minimum of 25 fire observations (see the cited work for more details).
A test for assessing independence between wildfire orientation and size
Specifically, principal component analysis is applied to points that constitute the boundary of the ob ject (fire or watershed), resulting an orientation given by the first principal component (PC1).
A test for assessing independence between wildfire orientation and size
After concluding the presence of dependence between wildfire orientation and size, it is possible to carry out a spatial watershed analysis by applying the test to each of the watersheds, in order to detect if the presence of dependence is homogeneous or if it is only related with some particular areas.
A test for assessing independence between wildfire orientation and size
Figure 4 represents the maps of the p–values of the test applied to the observations of each watershed, using PC1 in R2 and in R3 (left plot and right plot of Figure 4, respectively).
A test for assessing independence between wildfire orientation and size
The maps reveal the presence of 14 and 18 watersheds where the null hypothesis of independence is rejected with significance level α = 0.05, for the circular–linear and the spherical–linear cases, respectively.
A test for assessing independence between wildfire orientation and size
This shows that the presence of dependence between fire orientation and size is not homogeneous and it is localized at very particular watersheds.
A test for assessing independence between wildfire orientation and size
It is also interesting to note that the inclusion of the altitude coordinate in the calculus of the PC1 leads to a richer detection of dependence between the wildfire orientation and size at the watershed level.
A test for assessing independence between wildfire orientation and size
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