1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
kompoz [17]
3 years ago
10

A well pumps at 400 L/s from a confined aquifer whose thickness is 24 m. If the drawdown 50 m from the well is 1 m and the drawd

own 100 m from the well is 0.5 m, then calculate the hydraulic conductivity and transmissivity of the aquifer. Do you expect the drawdowns at 50 m and 100 m from the well to approach a steady state? Explain your answer. If the radius of the pumping well is 0.5 m and the drawdown at the pumping well is measured as 4 m, then calculated the radial distance to where the drawdown is equal to zero. Why is the state-state drawdown equation not valid beyond this distance?
Engineering
1 answer:
GrogVix [38]3 years ago
5 0

Answer:

the calculations and their justification are found in the explanation section.

Explanation:

The average transmissivity is

T=\frac{Q_{w} }{2\pi (s_{1}-s_{2} ) } ln(\frac{r_{2} }{r_{1} } )

Qw = pumping rate = 400 L/s = 400000 m³/s

s₁ = drawdown of the well = 1 m

s₂ = 0.5 m

r₁ = piezometric level = 50 m

r₂ = 100 m

Replacing values

T=\frac{400000}{2\pi (1-0.5)} ln(\frac{100}{50} )=88254.24m^{2} /s

the hydraulic conductivity is

K=\frac{T}{b}

b = thickness = 24 m

Replacing

K=\frac{88254.24}{24} =3677.26m/s

no steady state for this drawdown.

The radial distance is

s=s_{w} -\frac{Q_{w} }{2\pi T} ln(\frac{r}{r_{w} } )

here

sw = 4 m = drawdown at the pumping well

s =drawdown of the radial distance = 0

rw = radius of the pumping well = 0.5

Clearing r

0=4-\frac{400000}{2\pi *88254.24 } ln(\frac{r}{0.5} )\\4=0.721(lnr+ln0.5)\\r=exp(\frac{3.5}{0.721} )=128.3m

It can be said that the steady state reduction is not valid at a distance beyond that calculated because the reduction would become negative.

You might be interested in
3. Which of these instruments is used to measure wind speed? A. anemometer C. wind sock B. thermometer D. wind vane It is an ins
siniylev [52]

Answer:

wind vane if it can be used to show wind speed and the other is a

Explanation:

please mark 5 star if im right and brainly when ya can

5 0
3 years ago
The welding method that requires the operator to observe and only make corrections is
SVEN [57.7K]
Automatic manual semiautomatic
3 0
3 years ago
Read 2 more answers
It is possible to maintain a pressure of 10 kPa in a condenser that is being cooled by river water entering at 20 °C?
vovangra [49]

Answer:

Yes, it is possible to maintain a pressure of 10 kPa in a condenser that is being cooled by river water that is entering at 20 °C because this temperature (20 °C) of the external cooling water is less than the saturation temperature of steam which is which is 45.81 °C, and heated by a boiler; as a result of this condition, coupled with the assumption that the turbine, pump, and interconnecting tube are adiabatic, and the condenser exchanges its heat with the external cooling river water, it possible to maintain a pressure of 10 kPa.

5 0
3 years ago
CODE
zalisa [80]

Answer:

Explanation:

I'm not 100% this is what you want, but here it is:

2

3

13

8

11

A

13

6 0
2 years ago
We can model a certain battery as a voltage source in series with a resistance. The open-circuit voltage of the battery is 10 V
Angelina_Jolie [31]

Answer:

51.4 Ohms

Explanation:

By applying voltage division rule

V_f=v_i\times \frac {R_l}{R_l+R_m} where v is voltage, subscripts i and f represnt initial and final, R is resistance, m is internal and l is external.Substituting 7V for final voltage, 10V for initial voltage and the external resistance as 120 Ohms then

7=10*\frac {120}{120+R_m}\\7R_m+840=1200\\R_m={1200-840}{7}=51.428571\approx 51.4 Ohms

3 0
2 years ago
Other questions:
  • Where the velocity is highest in the radial direction? Why?
    9·1 answer
  • Windmills slow the air and cause it to fill a larger channel as it passes through the blades. Consider a circular windmill with
    10·1 answer
  • What is the main role of matrix in composites! a)-to transfer stress to the other phases b)- to protect phases from environment
    7·1 answer
  • Plz answer all of these questions!
    15·1 answer
  • (a) In a 3-phase, 4-wire system, the currents are in the A, B, and C lines under abnormal conditions of loading were as follows:
    9·1 answer
  • The best way to become a better reader is to study longer and harder in every subject. engage in a variety of extracurricular ac
    5·2 answers
  • What is the maximum value of the bending stress at the critical cross-section?
    14·1 answer
  • Which is equal to a temperature of 50°F?<br><br> 18°C<br> 46°C<br> 10°C<br> 32°C
    13·2 answers
  • A coil having a resistance of 10 ohms and an inductance of 4 H is switched across a 20W dc source. Calculate (a) time required b
    9·1 answer
  • What is acid mine drainage
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!