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Spacing of Drainage Wells in a Layered Aquifer
Author(s) -
Khan Muhammad Yunus,
Kirkham Don
Publication year - 1971
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/wr007i001p00166
Subject(s) - aquifer , groundwater recharge , geology , water table , hydraulic conductivity , drainage , aquifer test , drawdown (hydrology) , geotechnical engineering , specific storage , groundwater , radius , boundary value problem , well drainage , hydrology (agriculture) , soil science , mathematics , mathematical analysis , computer security , computer science , soil water , ecology , biology
A theory is presented to determine spacing of identical drainage wells that, by discharging groundwater simultaneously from a layered aquifer, will lower a water table to a preassigned level and maintain it. The theory has been developed by solving a mathematical boundary value problem. The wells are located on a certain regular grid, and the aquifer receives a uniform vertical recharge from rainfall or excess irrigation. The theory shows that the spacing depends on the thickness and hydraulic conductivity of each permeable layer tapped by the wells, the maximum allowable drawdown, the uniform vertical recharge, the radius of the wells, and the well grid geometry. A table of values of a function, useful for determining spacing of wells to be tapped in an aquifer that may consist of any number of permeable layers, is given.