Drawdown bar6/19/2023 ![]() 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.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.Aquifer is an underground layer of permeable rock or sand, that hold or transmit groundwater below the water table that yield a significant supply of water to a well.regional seasonal decline due to discharge in excess of recharge.in response to local, intensive groundwater pumping.interference from a neighbouring pumping bore.The main contributor to groundwater drawdown since the 1960s is over-exploitation of groundwater resources. A record of hydraulic head, or rate of flow ( discharge), versus time is more generally called a hydrograph (in both groundwater and surface water). Drawdown is often represented in cross-sectional diagrams of aquifers. In either case, drawdown is the change in hydraulic head or water level relative to the initial spatial and temporal conditions of the system. 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, or the water surface of a well, as a result of the withdrawal of water.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, there are two similar but distinct definitions in use for the word drawdown: JSTOR ( December 2009) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed.įind sources: "Drawdown" hydrology – news Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification. ![]()
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