If a relatively thin impervious formation of a stiff clay layer is encountered at a shallow depth underlain by an extensive thick confined alluvial aquifer, then it is an excellent location for a cavity well. A hole is drilled using the hand boring set, and casing pipe is lowered to rest firmly on the stiff […]
Flow of Water into Cavity Wells | Geography
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How to Determine the Probable Yield of Wells? | Geography
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The following tests may be performed to get an idea of the probable yield of the well: 1. Pumping Test: The water level is depressed to an amount equal to the safe working head for the subsoil. Then the water level is kept constant by making the pumping rate equal to the percolation into the […]
How to Calculate the Specific Capacity of a Well? | Ground Water
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The specific capacity (Q/sw) of a well is the discharge per unit drawdown in the well and is usually expressed in lpm/m. This is a measure of the effectiveness of a well. From Eqs. (4.78), (5.89) and (5.90). Which shows that the specific capacity of a well is not constant but decreases with the increase […]