Question

NEED PART B ONLY

A)Determine the conductivity K in gallons/day/ft^2 of a fully penetrating well in a confined aquafer. The aquifer is 100ft think with a steady state pumping rate of 1200 gpm. The drawdown is an observation well 75 ft away is 14ft and the drawdown in the second observation well 500 ft away Is 1.2ft

B) if the above data of pumping rate, drawdowns in different wells are for an unconfined aquifer, what will the conductivity be? What will intrinsic permeability for this unconfined aquafer be

NEED PART B ONLY

Answer #1

a) A well is pumped at an equilibrium flow of 454 gpm to
determine a confined aquifer permeability. The
thickness of the aquifer is 100 ft and the drawdown in observation
wells is noted as 3 ft and 9 ft at 100 ft and 10 ft respectively,
from the pumped well, What is the permeability¿
b) Using the same data as a) exceptmconsider an
unconfined aquifer that was totally saturated
before pumping, what is an estimate of permeability¿

1. Drawdown at a 0.20 m diameter, fully-penetrating well, which
has been pumping at a steady rate of 2500 m3/day for a
long time, is determined to be 1.2 m. Drawdown at an observation
well 10 m away is 0.90 m.
a. The aquifer is unconfined with a hydraulic head far from the
well of 10.0 m. Determine the hydraulic conductivity of the
aquifer.
b. How would your answer change if your aquifer was confined and
3 m in thickness?...

A 20 inch diameter well fully penetrates a 100 ft deep
unconfined aquifer. Drawdowns at two observation wells located at
90 feet and 240 feet from the pumping well are 23 feet and 21.5
feet respectivly. K = 1400 gpd/ft squared
Determine discharge Q from pumping the well in gpm

An unconfined aquifer is 25 m thick. Groundwater is being pumped
out from a 0.10 m diameter fully penetrating well. The pumping rate
is Qp=0.15 m3 /min. The aquifer is relatively sandy with a
hydraulic conductivity of 8.2 m/d. Steady-state drawdown of 1.5 m
is observed in a monitoring well 3 m away from the pumping well.
Estimate (a) the drawdown 10 m away from the pumping well, (b) the
drawdown in the pumping well.

A 25 cm well fully penetrates a confined aquifer of 35 m
thickness and has a permeability of 13.5 m/day When a steady state
discharge of 2400 L/min was being pumped for a long time,
observation well at radial distances of 140 m indicated drawdown of
2.2 m, Find: 1) The transmissivity of the aquifer, 2) The drawdown
at the pumping well, 3) The radius of influence, 4) The drawdown at
30 m from the well

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