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Cross-sectional plot of transient Theis solution for radial distance vs drawdown over time. The Theis equation was created by Charles Vernon Theis (working for the US Geological Survey) in 1935, [1] from heat transfer literature (with the mathematical help of C.I. Lubin), for two-dimensional radial flow to a point sink in an infinite ...
where s is drawdown (units of length e.g., m), is the pumping rate (units of volume flowrate e.g., m³/day), is the aquifer loss coefficient (which increases with time — as predicted by the Theis solution) and is the well loss coefficient (which is constant for a given flow rate).
Because the flow rate into or out of the well is not constant, as is the case in a typical aquifer test, the standard Theis solution does not work. Mathematically , the Theis equation is the solution of the groundwater flow equation for a step increase in discharge rate at the pumping well; a slug test is instead an instantaneous pulse at the ...
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 .
Nvidia stock dropped as much as 5% in early trading Monday, extending the prior week’s declines as investors reacted to Trump’s new tariffs.US president Donald Trump on Saturday announced an ...
The model, 29, amped up the starriness of the sartorial circuit at the Schiaparelli Spring 2025 Haute Couture show on Jan. 27, taking the runway by storm in a dramatic waist-whittling gown.
The tempered, multi-pane glass windows were also a “huge part of the equation,” Chasen said. The sole damage to the home was to two of the exterior panes – one cracked, while the other below ...
These equations relate a change in total or water volume (or ) per change in applied stress (effective stress — or pore pressure — ) per unit volume. The compressibilities (and therefore also S s ) can be estimated from laboratory consolidation tests (in an apparatus called a consolidometer), using the consolidation theory of soil mechanics ...