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DRAWDOWN FOR A PUMPED WELL
WellFunc.xls
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Exercises 8-13, 8-14, See Example 8-5.
S.L. Dingman
K value from Slug Tab
You must convert units of your K val.
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Uses the Theis solution for confined aquifers.See 'Theis' worksheet.
Physical Hydrology, 2nd Ed.
ft/secm/sec
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For unconfined aquifers, solution is valid for drawdown < 10% of ho.
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Input Data
Computed Values
0.0044 m3/sec=70 gpm
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Specify Aquifer Parameters and Pumping Rate:
0.0022 m3/sec=35 gpm
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Hydraulic Conductivity, K =
m/s0.00126 m3/sec=20 gpm
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Specific Yield, Sy=0.000315 m3/sec=5 gpm
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Initial Water-Table Height, ho =
m
<-this is the static water level not absolute pressure
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Pumping Rate, Qw =m^3/s
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Specify Distances r (m) and Times t (s):
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t(s) \ r(m) -->1 5 10 50 100
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======
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3600 #DIV/0!#DIV/0!#DIV/0!#DIV/0!#DIV/0!<< Values
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7200 #DIV/0!#DIV/0!#DIV/0!#DIV/0!#DIV/0!<< of
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144000 #DIV/0!#DIV/0!#DIV/0!#DIV/0!#DIV/0!<<aquifer
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2592000 #DIV/0!#DIV/0!#DIV/0!#DIV/0!#DIV/0!<<parameter
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518400000 #DIV/0!#DIV/0!#DIV/0!#DIV/0!#DIV/0!<< u(r,t)
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t(s) \ r(m) -->1 5 10 50 100
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======
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3600 #DIV/0!#DIV/0!#DIV/0!#DIV/0!#DIV/0!<< Values
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7200 #DIV/0!#DIV/0!#DIV/0!#DIV/0!#DIV/0!<< of
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144000 #DIV/0!#DIV/0!#DIV/0!#DIV/0!#DIV/0!<<well
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2592000 #DIV/0!#DIV/0!#DIV/0!#DIV/0!#DIV/0!<<function
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518400000 #DIV/0!#DIV/0!#DIV/0!#DIV/0!#DIV/0!<< W[u(r,t)]
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t(s) \ r(m) -->1 5 10 50 100
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======
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3600 #DIV/0!#DIV/0!#DIV/0!#DIV/0!#DIV/0!<< Values
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7200 #DIV/0!#DIV/0!#DIV/0!#DIV/0!#DIV/0!<< of
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144000 #DIV/0!#DIV/0!#DIV/0!#DIV/0!#DIV/0!<<draw-
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2592000 #DIV/0!#DIV/0!#DIV/0!#DIV/0!#DIV/0!<<down
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518400000 #DIV/0!#DIV/0!#DIV/0!#DIV/0!#DIV/0!<<ho - h(r,t) (m)
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#DIV/0!
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#DIV/0!
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t(s) \ r(m) -->1 5 10 50 100
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======
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3600 #DIV/0!#DIV/0!#DIV/0!#DIV/0!#DIV/0!<< Values
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7200 #DIV/0!#DIV/0!#DIV/0!#DIV/0!#DIV/0!<< of
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144000 #DIV/0!#DIV/0!#DIV/0!#DIV/0!#DIV/0!<<water-table
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2592000 #DIV/0!#DIV/0!#DIV/0!#DIV/0!#DIV/0!<<elevation
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518400000 #DIV/0!#DIV/0!#DIV/0!#DIV/0!#DIV/0!<<h(r,t) (m)
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