E Hydraulic testing Flashcards
1
Q
drawdown s
A
h0-h
2
Q
pumping does what to aquifer pressure
A
decreases pressure
the closer to the pumping the bigger the decrease
3
Q
why does rate at which the head goes down decreases with more pumping
A
because the area that water is being drawn from has expanded
4
Q
assumptions in pumping test
A
confined aquifer
constant pumping rate
flow is radial around well
horizontally infinite
compressible
water released instantaneously
no recharge to aquifer
homogeneous and isotropic
5
Q
drawdown s
A
Q/4piT ( ln(4Tt/r^2S) - 0.577 )
6
Q
-lnx is the same as
A
lnx^-1
7
Q
wells annual hydrograph
A
slow recession
quick recharge as rainfall events in the winter
8
Q
measuring wells is easier when
A
the well is in recession because that is slower and more constant
