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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 surface water hydrology and civil engineering, drawdown refers to the lowering of the surface elevation of a body of water, the water table, the piezometric surface ...
In hydrogeology, an aquifer test (or a pumping test) is conducted to evaluate an aquifer by "stimulating" the aquifer through constant pumping, and observing the aquifer's "response" ( drawdown) in observation wells. Aquifer testing is a common tool that hydrogeologists use to characterize a system of aquifers, aquitards and flow system boundaries.
Drawdown (economics) The drawdown is the measure of the decline from a historical peak in some variable (typically the cumulative profit or total open equity of a financial trading strategy). [1] Somewhat more formally, if is a stochastic process with , the drawdown at time , denoted , is defined as: The average drawdown (AvDD) up to time is ...
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 ...
In confined aquifers ( artesian ), the cone of depression is a reduction in the pressure head surrounding the pumped well. When a well is pumped, the water level in the well is lowered. By lowering this water level, a gradient occurs between the water in the surrounding aquifer and the water in the well. Because water flows from high to low ...
Sterling ratio. The Sterling ratio ( SR) is a measure of the risk-adjusted return of an investment portfolio . While multiple definitions of the Sterling ratio exist, it measures return over average drawdown, versus the more commonly used max drawdown. [citation needed] While the max drawdown looks back over the entire period and takes the ...
The Calmar ratio uses a slightly modified Sterling ratio – average annual rate of return for the last 36 months divided by the maximum drawdown for the last 36 months – and calculates it on a monthly basis, instead of the Sterling ratio's yearly basis. [1] Young believed the Calmar ratio was superior because. The Calmar ratio changes ...
Exposure at default or ( EAD) is a parameter used in the calculation of economic capital or regulatory capital under Basel II for a banking institution. It can be defined as the gross exposure under a facility upon default of an obligor. [1] Outside of Basel II, the concept is sometimes known as Credit Exposure ( CE ).
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