The initial piezometric head in a confined aquifer, which has a thickness of 11.6 m, is 85.7 m above sea level. A well with a radius of 0.5 m pumps at a constant rater 3 of 1,240 m3 /day. After the cone of depression has achieved equilibrium (i.e., steady state), the piezometric heads at two observation wells 40 m (well 2) and 95 m (well 1) from the pumping well are measured as 78.9 m and 83.4 m above sea level, respectively. - determine the total well losses in and around the pumping well if the observed head in the pumping well during equilibrium is 46.6 m. - A tracer was injected into well 1. We find it takes 50 days for the injected dye to travel to the well 2. Estimate the aquifer porosity (n).

The initial piezometric head in a confined aquifer, which has a thickness of 11.6 m, is 85.7 m above sea level. A well with a radius of 0.5 m pumps at a constant rater 3 of 1,240 m3 /day. After the cone of depression has achieved equilibrium (i.e., steady state), the piezometric heads at two observation wells 40 m (well 2) and 95 m (well 1) from the pumping well are measured as 78.9 m and 83.4 m above sea level, respectively. - determine the total well losses in and around the pumping well if the observed head in the pumping well during equilibrium is 46.6 m. - A tracer was injected into well 1. We find it takes 50 days for the injected dye to travel to the well 2. Estimate the aquifer porosity (n).

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Related questions

Q: A well is constructed to pump water from a confined aquifer. Two observation wells, MW1 and MW2, are…

Q: An experiment was conducted to determine the hydraulic conductivity of an artesian (i.e., pressured…

A: piezometric head difference=60-56=4mdistance between piezometers=150mtime to travel between…

Q: Suppose a well 0.30m in diameter has been pumped at a rate of 5,000cu.m/day for a long enough time…

Q: A 200 mm diameter well which fully penetrating a confined aquifer of thickness 25 m is pumped at a…

Q: A well is constructed to pump water from a confined aquifer. Two observation wells, MW1 and MW2, are…

Q: a hydraulic jump, the depths on the two sides e 0.4 m and 1.4 m. The head loss in the jump is early?

A: Depth, y1 = 0.4 m and y2 = 1.4 m

Q: A pump test was conducted on a test well drilled into a confined aquifer that is 4.80 m thick. Two…

Q: Explain how drawdowns predicted by the Hantush-Jacob (1955) leaky aquifer solution differ from…

A: Leaky aquifers When a leaky aquifer is pumped-up, the piezometric level of the geological formation…

Q: How would I calulate the time it would take for the plume to reach the next well in it's path? Plume…

A: Given data: Thickness of aquifer=5.5m Bulk density=1.75 g/cm3 Porosity=0.35 Organic carbon=0.55%…

Q: A well of 20 cm diameter fully penetrates a confined aquifer. After a long period of pumping at a…

Q: Question In a hydraulic jump occurring in a horizontal rectangular channel the sequent depths are…

A: A hydraulic jump case- Sequent depths- y1 = 0.25 m y2 = 1.25 m To find - The value of the energy…

Q: 14. A 40-cm-diameter well draws water from a confined aquifer at the rate of 1.33 m³/sec. The…

Concept explainers

Groundwater Flow

The term groundwater refers to the water which is found beneath the earth's surface. Pores present in the soil and rocks with fractures make a passage for rainwater to enter the earth's surface and deposit as groundwater. The flow nature and direction of groundwater under the earth's surface directly impacts the strength and compressibility of the soil, which reflects its ability to support structural loads.

Question

The initial piezometric head in a confined
aquifer, which has a thickness of 11.6 m, is 85.7
m above sea level. A well with a radius of 0.5 m
pumps at a constant rate r 3 of 1,240 m3 /day.
After the cone of depression has achieved
equilibrium (i.e., steady state), the piezometric
heads at two observation wells 40 m (well 2)
and 95 m (well 1) from the pumping well are
measured as 78.9 m and 83.4 m above sea level,
respectively.
- determine the total well losses in and around
the pumping well if the observed head in the
pumping well during equilibrium is 46.6 m.
A tracer was injected into well 1. We find it
takes 50 days for the injected dye to travel to the
well 2. Estimate the aquifer porosity (n).

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step by step

Solved in 2 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.

Similar questions

4
Q10. From the pumping of a semiconfined aquifer of thickness 31 m and permeability 22 m/d, it is estimated that the recharge rate from an overlaying unconfined aquifer through an aquitard of thickness 2.5 m, is 55 mm/year. The average piezometric surface in the semiconfined aquifer is 15 m below the water table in the unconfined aquifer. Determine the hydraulic characteristics of the aquitard (semi-confining layer) and the aquifer. If a well drilled in the aquifer in is pumped at the rate of 4,000 m³/day, how many square kilometers of recharge area are required to sustain the flow at the estimated recharge rate?
.A confined aquifer of 15 m constant thickness is sandwiched between two aquicludes as shown in the figure (not drawn to scale) Piezometer P 55.2m Piezometric Surface Aquiclude Aquifer Aquiclude Piezometer Q L = 2500m 34.1m The heads indicated by two piezometers P and Q are 55.2 m and 34.1 m, respectively. The aquifer has a hydraulic conductivity of 80 m/ day and its effective porosity is 0.If the distance between the piezometers is 2500 m, the time taken by the water to travel through the aquifer from piezometer location P to Q (in days, round off to 1 decimal place) is
A well is constructed to pump water from a confined aquifer. Two observation wells, MW1 and MW2, are constructed at distances of 10 m and 100 m, respectively. Water is pumped from the pumping well at a rate of 0.8 m³/min. At steady state, drawdown is observed as 5 m in MW2 and 19 m in MW1. Note that drawdown is greater for well MW1 located closest to the pumping well. Determine the Transmissivity (cm²/s) if the aquifer is 40 m thick. (Please enter your answers with 2 decimals)
In a hydraulic jump occurring in a horizontal rectangular channel the sequent depths are 0.5 m and 1.5 m The energy loss in this jump is (A) 1 m (C) 2 m (B) 1.5 m (D) 0.33 m
We have a land well where the geothermal gradient is 0.03 C/ m. The surface temperature is 68 Fahrenheit. The well is 4000 meters deep. 1) Calculate the formation temperature at a depth of 4000 meters. The answer must be in Celsius. The pore pressure of 4000 meters is 1.7 sg. We are unlucky and take in a kick / well kick. The volume of the gas bubble is 3 m ^ 3 when we take in the kick. We allow the kick to migrate all the way to the surface without closing the well. 2) What will the gas volume be at the surface?
At a hydraulic jump, the depths at its two sides are 0.3 m and 1.2 m. The head loss in the jump is
2. (a) A well in an aquifer is pumped over a long period at a rate of 0.05 m3 /s under approximate steady-state conditions. The steady-state drawdowns, from the water table level, at two observation wells at 25 m and 50 m from the abstraction well were observed to be 15.3m and 9.5m, respectively. If the saturated thickness of the aquifer prior to pumping is 80 m, determine the hydraulic conductivity of the aquifer material. (b) Will the actual drawdown in the pumping well be more than the theoretical drawdown? If yes, why and what measures can you recommend for reducing the drawdown in the pumping well?
A well in an unconfined aquifer is pumped at the rate of 50 L/s ( 800 gal/min.). The thickness of the aquifer is 30 m. and the elevation of the phreatic surface is 25 m. above the underlying aquiclude at an observation of well 20 m away from the well and 34.6 m above at a well 50 m. away. What is the value of K for this aquifer?
10. A single well pumps water from a horizontally infinite confined aquifer at a rate of 6 m³/day beginning at time t = 0. The aquifer has a transmissivity (T) of 50 m²/day and a storativity S of 0.0001. Use the Theis solution (eqs. 9.4.5-7) and Table 9.1 to calculate the drawdown in a monitoring well located 44 m from the pumping well after 10 days and after 90 days.
Q2. A pumping tests are carried out using testing well (pumping well for testing only) and two observational wells. The observation wells were installed at 10 and 30.5 m, respectively, from the testing well. In both wells, the initial piezometric head was 36.2 m. The pumping proceeded at a rate of 0.19 m³/s. After few days the piezometric head stabilized at 30.7 m and 32.9 m in the first and second observational wells, respectively. Determine: a. Transmissivity of the aquifer. b. The well radius of influence. c. The maximum drawdown if the well radius is 0.47 m.