Q1: A field sample of an aquifer is packed in a test cylinder. The cylinder has a length of 120 cm and a diameter of 12 cm. The field sample with a porosity of 0.24 is tested under a constant head difference of 160 cm with water at 10°C. If the estimated hydraulic conductivity of the sample is 50 m/day, calculate (a) the expected total discharge, (b) the specific discharge (velocity), (c) the average flow velocity, and (d) the hydraulic gradient along the cylinder.

Q1: A field sample of an aquifer is packed in a test cylinder. The cylinder has a length of 120 cm and a diameter of 12 cm. The field sample with a porosity of 0.24 is tested under a constant head difference of 160 cm with water at 10°C. If the estimated hydraulic conductivity of the sample is 50 m/day, calculate (a) the expected total discharge, (b) the specific discharge (velocity), (c) the average flow velocity, and (d) the hydraulic gradient along the cylinder.

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: Seepage is occurring through a porous media shown in fig. The hydraulic conductivity values (k1,k2,…

Q: Please explain part 1 (ii) of the question given. 1) i) A 6 inch diameter well that fully…

A: The given data is: Diameter of well (dw) = 6 inch = 0.5 ft Thickness of aquifer (b) = 40 ft…

Q: 1. A sand sample of 35 cm² cross sectional area and 20 cm long was tested in a constant head…

A: Given :

Q: schematic of a constant head permeability test is shown below. The measured essures at points A and…

Q: for the constant hea permeability test set-u shown in the following figure, the followin…

A: L =30 mArea if specimen = 175 sq. cm.Constant head difference = 50 cmVolume of water collected in 5…

Q: A confined aquifer has a hydraulic conductivity of 100 m/day. The porosity of the aquifer is 0.3.…

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: An unconfined aquifer is 100 feet thick was evaluated using a field pumping test. The depth to…

A: In this problem I have drawn a diagram and wrote distance corresponding to their drawdown Since from…

Q: A falling-head permeameter contains a sample of length 10 centimeters and diameter 4 centimeters.…

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

Q1: A field sample of an aquifer is packed in a test cylinder. The cylinder has a length of 120 cm
and a diameter of 12 cm. The field sample with a porosity of 0.24 is tested under a constant
head difference of 160 cm with water at 10°C. If the estimated hydraulic conductivity of the
sample is 30 m/day, calculate (a) the expected total discharge, (b) the specific discharge
(velocity), (c) the average flow velocity, and (d) the hydraulic gradient along the cylinder.

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: Given data

Step 2: Calculation

Step 3: Calculation

Solution

Step by step

Solved in 4 steps with 3 images

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

A 400 mm diameter test well penetrates 27 m below the static water table. After 24 hours of pumping at 75 liters/sec, the water level in an observation well at a distance of 100 m from the test well is lowered 0.35 m. The other observation well at a distance of 40 m from the test well has a drawdown of 0.97 m. Compute the transmissibility of the aquifer in m?/day.
An unconfined aquifer is 10 m thick and is being pumped so that one observation well placed at a distance 76 m shows a drawdown of 0.5 m. On the opposite side of the extraction well is another observation well 100 m from the extraction well, shows a drawdown of 0.3 m. Assume the coefficient of permeability of 50 m/day. a.) What is the discharge f the extraction well? b.) Suppose the well at 100 m from the extraction well is now pumped. Show with a sketch what this will do to the drawdown. c.) Suppose the aquifer sits on an aquaclude that has a slope of 1/100. Show with a sketch what this will do to the drawdown.
In a field testing, the hydraulic gradient between two peizometers is 1.11, the area of flow is 4.08 m2 and the hydraulic conductivity of the aquifer material is 0.94 m/day, calculate the discharge in m3/day. Note that discharge cannot be negative
7.7 In a constant-head permeability test, the length of the specimen is 200 mm and the cross sectional area is 78.5 cm². If k = 2.1 x 10-2 cm/sec, and a rate of flow of 130 cm³/min has to be maintained during the test, what should be the head difference across the specimen?
A field pumping test was conducted from an aquifer of sandy soil of 4 m thickness confined between two impervious strata. When equilibrium was established, 105 liters of water was pumped out per hour. The water elevation in an observation well 3.50 m away from the test well was 2.1 m and another 6.0 m away was 2.7 m from the roof level of the impervious stratum of the aquifer. Find the value of k of the soil in m/sec.
A soil sample is placed in a 1m long and 10cm diameter tube. A constant supply of water is allowed to flow from inlet to outlet. The total water head at the inlet is 2m and the total water head at the outlet is 1m. The hydraulic conductivity is 0.001 cm/s. Which of the following answer is correct? O a. The flow velocity is 0.001 cm/s Ob. The flow velocity is 25 cm/s c. The hydraulic gradient in the tube is 2 Od. The hydraulic gradient in the tube is 0.001
Problem (4) The following results have been reported for field pumping test from a well, where the top permeable layer is unconfined and underlain by an impermeable layer, for a steady state condition: m3 q = 0.68 min h, = 5.6m at r, = 60m h, = 5m at r, = 30m Calculate the hydraulic conductivity (cm/s) of the permeable layer.
Q. Solve this seepage problem.
A falling-head permeameter contains a sample of length 10 centimeters and diameter 4 centimeters. The falling-head tube has an inside diameter of 1 centimeter. The head falls from 5 to 2 centimeters over a period of 70 minutes. a. What is the hydraulic conductivity in cm/sec? b. The water temperature was 21° C. At this temperature the density of water is 0.997 g/cm³ and the viscosity is 0.00988 g/sec-cm. What is the intrinsic permea- bility of the sample?
please answer all parts