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2. Drawdown (hydrology) - Wikipedia

   en.wikipedia.org/wiki/Drawdown_(hydrology)

   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 ...

3. Pressure tank - Wikipedia

   en.wikipedia.org/wiki/Pressure_tank

   The diaphragm or bladder may itself exert a pressure on the water, but it is usually small and will be neglected in the following discussion. Case 1 is an empty tank at the charging pressure P c (gauge). The total volume of the tank is V t. Case 2 is a tank in use, with the air pressure at pressure P (gauge) and a water volume of V

4. Well test - Wikipedia

   en.wikipedia.org/wiki/Well_test

   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 ...

5. Aquifer test - Wikipedia

   en.wikipedia.org/wiki/Aquifer_test

   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 ...

6. Bladder tank - Wikipedia

   en.wikipedia.org/wiki/Bladder_Tank

   Bladder tank for fire protection Labaronne's patent A bladder tank is a large, flexible container used to store many types of liquids . [ 1 ] When maximum capacity is reached, the bladder tank takes the form of a large pillow , hence it is also called a pillow tank .

7. Cone of depression - Wikipedia

   en.wikipedia.org/wiki/Cone_of_depression

   In confined aquifers , 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 water levels or ...

8. Hydraulic accumulator - Wikipedia

   en.wikipedia.org/wiki/Hydraulic_accumulator

   If the accumulator is not of the piston type care must be taken that the bladder or membrane will not be damaged in any expected over-pressure situation, many bladder-type accumulators cannot tolerate the bladder being crushed under pressure. A compressed gas accumulator was invented by Jean Mercier [5] for use in variable-pitch propellers.

9. Well drainage - Wikipedia

   en.wikipedia.org/wiki/Well_drainage

   The well filter must be placed in a permeable soil layer. The spacing can be calculated with a well spacing equation using discharge, aquifer properties, well depth and optimal depth of the water table. The determination of the optimum depth of the water table is the realm of drainage research.