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In hydrology, there are two similar but distinct definitions in use for the word drawdown: In subsurface hydrogeology , drawdown is the reduction in hydraulic head observed at a well in an aquifer , typically due to pumping a well as part of an aquifer test or well test .
In hydrology, a well test is conducted to evaluate the amount of water that can be pumped from a particular water well.More specifically, a well test will allow prediction of the maximum rate at which water can be pumped from a well, and the distance that the water level in the well will fall for a given pumping rate and duration of pumping.
This template inserts a character resembling a Vietnamese tilde diacritic, called an apex in the Dictionarium Annamiticum Lusitanum et Latinum by Alexandre de Rhodes. This diacritic has not been included in the Unicode standard, so a lookalike, U+1DC3 ᷃ COMBINING SUSPENSION MARK , is used instead as a workaround.
Drawdown (economics), decline in the value of an investment, below its all-time high; Drawdown (hydrology), a lowering of a reservoir or a change in hydraulic head in an aquifer, typically due to pumping a well; Drawdown card, used for testing paints and coatings through wet film preparation; Drawdown chart, paper used to test various coating ...
A loss of just over 24 percent on May 5, 1893, from 39.90 to 30.02 signaled the apex of the stock effects of the Panic of 1893; the 2007–2008 crash was a 61.8 percent retracement thereof that began on October 11, 2007, and lasted until the closing low on March 9, 2009.
The drawdown duration is the length of any peak to peak period, or the time between new equity highs. The max drawdown duration is the worst (the maximum/longest) amount of time an investment has seen between peaks (equity highs).
Project Drawdown is a climate change mitigation project initiated by Paul Hawken and climate activist Amanda Joy Ravenhill. The Project Drawdown website includes video lessons [ 3 ] that explain the analysis and insights behind the efforts and research that make up the science behind the project.