For an unconfined aquifer with uniform recharge problem, the initial water table is 10 meters above the confining layer. Given recharge rate from rainfall 50 cm/year, pumping rate 1000 m^3 /day, aquifer hydraulic conductivity 10 m/day, calculate the effective radius and calculate steady-state groundwater head at 100 meters away from the pumping well.
Homework Answers
Add Answer to:
For an unconfined aquifer with uniform recharge problem, the initial water table is 10 meters abo...
2. Parallel drainage canals are installed in a rectangular unconfined aquifer. They fully penetrate the aquifer and are 50 m apart. The elevation difference between the land surface and the bottom of...
2. Parallel drainage canals are installed in a rectangular unconfined aquifer. They fully penetrate the aquifer and are 50 m apart. The elevation difference between the land surface and the bottom of the canals is 5 m and the canal stages are 2.5 m. Assume a soil hydraulic conductivity of 0.8 m/day Recharge Land surface 50ml Drainagelcanal 2.5m Impermeable layer (a) Sketch the approximate shape of the water table between the two canals under a highly urbanized condition in which...
Use the diagram of the unconfined (water-table) aquifer on the next page for the following questions....
Use the diagram of the unconfined (water-table) aquifer on the next page for the following questions. A. This area receives 116 cm/yr of rainfall. It is not vegetated. Evaporation, as measured 2. by pan experiments, totals 90 cm/yr. The hydraulic conductivity of the aquifer unit is homogeneous and isotropic, and has been measured at 0.32 f/day. Where is the groundwater divide in the unconfined aquifer? B. What is the maximum height of the water table? C. What is the water...
An engineer has been asked to investigate illegal pumping of groundwater from an unconfined aquifer. The...
An engineer has been asked to investigate illegal pumping of groundwater from an unconfined aquifer. The maximum withdrawal rate for the well has been set by the State Water Resources Board at 30,000 ft/day. The water table far from the well is 20 f below the surface. The depth to the confining bed is 50 ft. Two observation wells have been installed near the pumping well to assess the groundwater withdrawal rate. The first well is located 100 ft from...
An unconfined aquifer has an initial thickness of 15.80 m. The initial water table is horizontal...
An unconfined aquifer has an initial thickness of 15.80 m. The initial water table is horizontal and located 4.7 m below the ground surface. A 15-cm diameter well is driven to the bottom of the aquifer and pumped at 3000 Lpm until steady state conditions are achieved. At this time the drawdown at the well is 4.35 m and the drawdown in an observation well located 850 m away is 0.12 m. (a) Make a sketch that defines the problem....
Question 5: (25 marks) A fully penetrating pumping well is located in a confined aquifer that can be considered to have an infinite extent in all directions. There is no recharge to the aquifer a...
Question 5: (25 marks) A fully penetrating pumping well is located in a confined aquifer that can be considered to have an infinite extent in all directions. There is no recharge to the aquifer and no other pumping wells in the area. There are two observation wells located at 100 and 500 m, respectively, from the pumping wells. The aquifer and the pumping well have the following properties: Depth to top of aquifer: 50 m Aquifer thickness: 5 m Aquifer...
A contaminated plume is found having capture zone type curve Q/BU = 2000 m. U is...
A contaminated plume is found having capture zone type curve
Q/BU = 2000 m. U is the regional groundwater velocity, Q is pumping
rate and B is the aquifer thickness. The aquifer also has a
hydraulic conductivity of 3 × 10-5 cm/sec, a hydraulic gradient of
0.003 and a storavity of 0.005. The aquifer is 30 m thick. The
diameter of the well is 10 inch and the equation for
non-equilibrium condition is:
Where T is transmissivity, r is the...
A 0.5-m diameter well fully penetrates an unconfined aquifer, which is 40.0 m thick. The drawdown...
A 0.5-m diameter well fully penetrates an unconfined aquifer, which is 40.0 m thick. The drawdown at the pumped well is 10 m and the hydraulic conductivity of the aquifer is 0.2 . 10-3 (m s-'). If the flow is steady and discharge is 0.01 (mºs-'), determine the drawdown at a site 50.0 m from the well. Draw-down (m): 5.0 8.6 18.6 30.0 A wastewater treatment plant treats 1000 (mº
An aquifer test with a constant pumping rate of 200 gpm was conducted in a confined aquifer with ...
An aquifer test with a constant pumping rate of 200 gpm was conducted in a confined aquifer with a saturated thickness of 12 m. Head measurements in an observation well located 76.2 m (250 ft) from the pumping well yields the following plot. Use the Cooper-Jacob (1946) straight-line method to compute transmissivity [m/d], hydraulic conductivity [m/d and m/s], storativity and specific storage m ] of the aquifer 0 0.2 0.4 0.6 0.8 1.2 0.1 10 100 1000 Time (min)
An...
6.124pts) Giselle has installed a water production well in an unconfined aquifer, She is concerne...
please explain the answer for part D.
6.124pts) Giselle has installed a water production well in an unconfined aquifer, She is concerned about the possibility that when the well is in use drawdown will ower the piezometric and that the water will stop flowing. She has asked for your help in the analysis well surface to the bottom of the Currently, the drawdown at observation well A, 120.0 m from the pumped well, s 12.0m. Observation at 80.0 meters is...
The sediments that formed the Nubian aquifer system are much older than those of the High...
The sediments that formed the Nubian aquifer system are
much older than those of the High Plains aquifer system or the
sediments of Bangladesh. The oldest rocks in the aquifer are
Cambrian in age (541 to 485 million years old). After deposition,
these sediments were buried, compacted, and cemented, and lithified
to form sedimentary rocks. Two cross sections are shown. The sands
that form the sandstones were deposited by rivers and wind in
nearshore (beach) areas. The sandstone is distinguished...
2. Parallel drainage canals are installed in a rectangular unconfined aquifer. They fully penetrate the aquifer and are 50 m apart. The elevation difference between the land surface and the bottom of the canals is 5 m and the canal stages are 2.5 m. Assume a soil hydraulic conductivity of 0.8 m/day Recharge Land surface 50ml Drainagelcanal 2.5m Impermeable layer (a) Sketch the approximate shape of the water table between the two canals under a highly urbanized condition in which...
Use the diagram of the unconfined (water-table) aquifer on the next page for the following questions. A. This area receives 116 cm/yr of rainfall. It is not vegetated. Evaporation, as measured 2. by pan experiments, totals 90 cm/yr. The hydraulic conductivity of the aquifer unit is homogeneous and isotropic, and has been measured at 0.32 f/day. Where is the groundwater divide in the unconfined aquifer? B. What is the maximum height of the water table? C. What is the water...
An engineer has been asked to investigate illegal pumping of groundwater from an unconfined aquifer. The maximum withdrawal rate for the well has been set by the State Water Resources Board at 30,000 ft/day. The water table far from the well is 20 f below the surface. The depth to the confining bed is 50 ft. Two observation wells have been installed near the pumping well to assess the groundwater withdrawal rate. The first well is located 100 ft from...
Question 5: (25 marks) A fully penetrating pumping well is located in a confined aquifer that can be considered to have an infinite extent in all directions. There is no recharge to the aquifer and no other pumping wells in the area. There are two observation wells located at 100 and 500 m, respectively, from the pumping wells. The aquifer and the pumping well have the following properties: Depth to top of aquifer: 50 m Aquifer thickness: 5 m Aquifer...
A contaminated plume is found having capture zone type curve
Q/BU = 2000 m. U is the regional groundwater velocity, Q is pumping
rate and B is the aquifer thickness. The aquifer also has a
hydraulic conductivity of 3 × 10-5 cm/sec, a hydraulic gradient of
0.003 and a storavity of 0.005. The aquifer is 30 m thick. The
diameter of the well is 10 inch and the equation for
non-equilibrium condition is:
Where T is transmissivity, r is the...
A 0.5-m diameter well fully penetrates an unconfined aquifer, which is 40.0 m thick. The drawdown at the pumped well is 10 m and the hydraulic conductivity of the aquifer is 0.2 . 10-3 (m s-'). If the flow is steady and discharge is 0.01 (mºs-'), determine the drawdown at a site 50.0 m from the well. Draw-down (m): 5.0 8.6 18.6 30.0 A wastewater treatment plant treats 1000 (mº
An aquifer test with a constant pumping rate of 200 gpm was conducted in a confined aquifer with a saturated thickness of 12 m. Head measurements in an observation well located 76.2 m (250 ft) from the pumping well yields the following plot. Use the Cooper-Jacob (1946) straight-line method to compute transmissivity [m/d], hydraulic conductivity [m/d and m/s], storativity and specific storage m ] of the aquifer 0 0.2 0.4 0.6 0.8 1.2 0.1 10 100 1000 Time (min)
An...
please explain the answer for part D.
6.124pts) Giselle has installed a water production well in an unconfined aquifer, She is concerned about the possibility that when the well is in use drawdown will ower the piezometric and that the water will stop flowing. She has asked for your help in the analysis well surface to the bottom of the Currently, the drawdown at observation well A, 120.0 m from the pumped well, s 12.0m. Observation at 80.0 meters is...
The sediments that formed the Nubian aquifer system are
much older than those of the High Plains aquifer system or the
sediments of Bangladesh. The oldest rocks in the aquifer are
Cambrian in age (541 to 485 million years old). After deposition,
these sediments were buried, compacted, and cemented, and lithified
to form sedimentary rocks. Two cross sections are shown. The sands
that form the sandstones were deposited by rivers and wind in
nearshore (beach) areas. The sandstone is distinguished...
Most questions answered within 3 hours.
-
Please answer true or false. Words
cannot be changed or added in to make it true...
asked 45 minutes ago -
An empty test tube weighs 15.923 grams. Then,
MgCl2•6H2O is added into the test tube. After...
asked 47 minutes ago -
(a) A piston at 6.1 atm contains a gas that occupies a volume of
3.5 L....
asked 46 minutes ago -
Assume memory access is 10 units of time and disk access is
10000 units of time....
asked 1 hour ago -
1. Are all good samples random?
2. Magazines often report surveys giving statistics such as “63%...
asked 1 hour ago -
Under all the various types of market structures, firms
must eventually earn some economic profits for...
asked 1 hour ago -
Consider the following fitness regime for a single locus trait
with two co-dominant alleles: w11 =...
asked 1 hour ago -
A large cable company reports the following.
80% of its customers subscribe to its cable TV...
asked 1 hour ago -
Please answer the question in brief.
Discuss the role of ERP in organizations. Are ERP tools...
asked 1 hour ago -
Discuss the pros and cons of collaborative software such
as SameTime. Does it increase productivity? What...
asked 1 hour ago -
Buying your in-laws a gift because it’s expected is
due to the ____________ motive of gift-giving....
asked 1 hour ago -
Calculate the expected value, the variance, and the standard
deviation of the given random variable X....
asked 2 hours ago