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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 .
An aquifer test (or a pumping test) is a hydrogeological technique to evaluate an aquifer by pumping water and observing the drawdown in wells. Learn about the general characteristics, analysis methods and assumptions of aquifer tests, such as the Theis and Thiem solutions.
Drawdown is the measure of the decline from a historical peak in some variable, such as the profit or equity of a financial trading strategy. Learn about the definitions, formulas, examples and optimization of drawdown in finance and other fields.
Calmar ratio is a performance measurement for commodity trading advisors and hedge funds. It is based on the average annual return and the maximum drawdown over the last 36 months.
Specific capacity is a quantity that indicates how much water a well can produce per unit of drawdown. It is obtained from a step drawdown test and depends on the pumping rate and the aquifer characteristics.
Specific storage is a hydrogeological property that measures the volume of water released from an aquifer per unit volume and decline in hydraulic head. Learn how to calculate specific storage, storativity and specific yield, and see values for different aquifer materials.
CAGR stands for compound annual growth rate, a term used in business, economics and investing to measure the annualized growth rate of compounding values. Learn how to calculate CAGR, see examples of its applications and compare it with other related concepts.
If the drawdown is put in as a positive number, then add 10% and the result is the same positive ratio. [ citation needed ] To clarify the reason he (Deane Sterling Jones) used 10% in the denominator was to compare any investment with a return stream to a risk-free investment (T-bills).
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