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Aquifer test (or a pumping test) is a field experiment in which a well is pumped at a controlled rate and the aquifer's response (drawdown) is measured in one or more observation wells. [ 5 ] Cone of depression is a conically-shaped depression that is produced in a water table as a result of pumping water from a well at a given rate.
Often the well efficiency is determined from this sort of test, this is a percentage indicating the fraction of total observed drawdown in a pumping well which is due to aquifer losses (as opposed to being due to flow through the well screen and inside the borehole). A perfectly efficient well, with perfect well screen and where the water flows ...
where s is the drawdown (change in hydraulic head at a point since the beginning of the test in units of distance), u is a dimensionless parameter, Q is the discharge (pumping) rate of the well (volume per unit time), T and S are the transmissivity and storativity of the aquifer around the well (distance squared per unit time and dimensionless ...
CHK – choke (a restriction in a flowline or a system, usually referring to a production choke during a test or the choke in the well control system) CHKSR – checkshot survey report CHKSS – checkshot survey log
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 ...
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