Tutorial Letter Wen2601
Tutorial Letter Wen2601
Tutorial Letter Wen2601
Year module
BARCODE
Open Rubric
CONTENTS
Page
2
WEN2601/101/0/2020
Dear Student
As part of this tutorial letter, we wish to inform you that Unisa has implemented a transformation
charter based on five pillars and eight dimensions. In response to this charter, we have also
placed curriculum transformation high on the agenda. For your information, curriculum
transformation includes the following pillars: student-centred scholarship, the pedagogical
renewal of teaching and assessment practices, the scholarship of teaching and learning, and
the infusion of African epistemologies and philosophies. These pillars and their principles will be
integrated at both the programme and module levels, as a phased-in approach. You will notice
the implementation thereof in your modules, and we encourage you to fully embrace these
changes during your studies at Unisa.
2.2 Outcomes
Students are expected to be able to interpret a given physical engineering situation, analyse the
situation and apply the laws of nature, expressed by formulas, to obtain an answer to the
problem.
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The student should be able to:
• E-mail: chabadt@unisa.ac.za
Because of the nature of the module, you are advised to send emails.
Under no circumstances should the lecturer be contacted with regard to examination dates,
results, receipt of assignment or assignment marks.
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WEN2601/101/0/2020
3.2 Department
You may contact the Department of Civil and Chemical Engineering by post, email, telephone,
or online through myUnisa.
Department Address:
Department of Civil and Chemical Engineering
Unisa (Florida Campus)
Private Bag x6
Florida
1710
Phone : 011 471 2048/3132
E-mail address : civil&chemical@unisa.ac.za
Always state your STUDENT NUMBER and the Module Code WEN2601 in all correspondence
and enquiries.
Thus, whenever you contact the Department of Civil and Chemical Engineering, ensure that the
first thing you mention after greeting is the Module’s code! It does not help to say you are a
student in Civil Engineering since there are several modules.
3.3 University
If you need to contact the University about matters not related to the content of this module,
please consult the publication my Studies @ Unisa that you received with your study material
contains information on how to contact the University (e.g. to whom you can write for different
queries, important telephone and fax numbers, addresses and details of the times certain
facilities are open).
Always have your student number at hand when you contact the University.
Enquiries will should be channelled to the correct department. The details are as follows:
Email: study-info@unisa.ac.za
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4 RESOURCES
4.1 Prescribed book(s)
WATER ENGINEERING
AUTHOR : C. F. Meyer
PUBLISHER : C. F. Meyer
YEAR : Latest available edition
Prescribed books can be obtained from the University’s official booksellers. If you have difficulty
in locating your book(s) at these booksellers, please contact the Prescribed Book Section at Tel:
012 429-4152 or e-mail vospresc@unisa.ac.za.
Should you encounter any anomalies or mistakes, please contact your Lecturer.
Recommended guides:
For information on the various student support systems and services available at Unisa (e.g.
student counselling, tutorial classes, language support), please consult the publication Your
Service Guide @ Unisa that you received with your study material.
Study groups
It is advisable to have contact with fellow students. One way to do this is to form study groups.
The addresses of students in your area may be obtained from the following department:
Directorate: Student Administration and Registration
PO Box 392
UNISA
0003
Alternatively, contact the Unisa Call Centre 086 167 0411.
myUnisa
You are strongly advised to register and use myUnisa. The myUnisa learning management
system is Unisa's online campus that will help you to communicate with your lecturers, with
other students and with the administrative departments of Unisa – all through the computer and
the internet.
To go to the myUnisa website, start at the main Unisa website, http://www.unisa.ac.za, and then
click on the “Login to myUnisa” link on the right-hand side of the screen. This should take you
to the myUnisa website. You can also go there directly by typing in http://my.unisa.ac.za.
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Please consult the publication my Studies @ Unisa which you received with your study material
for more information on myUnisa.
You must register on myUnisa to be able to submit assignments, to have access to the Library
functions, download study material, “chat” to your lecturer or fellow students and participate in
online discussion forums and get access to all sorts of learning resources.
myUnisa will be used for general communications in this module.
Discussion classes
A discussion class or contact session might be scheduled for this module. If it is the case, the
date and location of the class will be posted on myUnisa. Note that such classes are likely to be
scheduled after the date of submission of the last assignment.
6 STUDY PLAN
N/A
7 PRACTICAL WORK
Water Engineering II practical (WEN2PRA) is the practical component of WEN2601
8 ASSESSMENT
8.1 Assessment criteria
This module is part of a year long system, not a semester system.
Formative assessment
Evidence of competence is provided through 3 individual assignments that address different
learning outcomes of the course. Competence is assessed using a memorandum.
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Summative assessment
Evidence of competence is provided through an exam that addresses the learning outcomes of
the course. Competence is assessed using a memorandum.
Assessment preparation
Students are informed of the assessment content, activities and requirement through Tutorial
Letter 101. An internal moderator provides comments on Tutorial letter 101 before it is finalised.
The examiners and moderator of the exam comment on the exam questions before they are
finalised. All assessment procedures, requirements and instructions are provided in Tutorial
Letter 101. Students with special needs as well as students who need clarification should
contact the lecturer.
Reassessment
Students who reach the subminimum of 40% at the October/November exam session qualify
for reassessment and will rewrite the exam during the January/February exam session.
Assignment 1 753058
Assignment 2 671448
Assignment 3 870808
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posted on myUnisa or elsewhere, refers to administrative dates as managed by the
Assignments Department and does NOT influence or change the above dates.
Assignment 1 11 May 2020
Student must send a filled extension request form (available on myUnisa) before the due date of
the assignment. At his discretion the lecturer may grant an extension of up to two weeks for an
assignment when satisfied there are reasonable grounds and that the approved extension will
not give undue advantage or disadvantage to the student. If a student is unable to submit an
assignment on the due date due to other commitments, then it is recommended the student
submit on a day earlier to the due. Early submissions are strongly encouraged. In fairness to
students who meet the assignment due date and time, late submissions will receive a zero
mark.
For detailed information on assignments, please refer to the my Studies @ Unisa brochure,
which you received with your study package.
To submit an assignment via myUnisa (except assignment 2 and 3)
• Go to myUnisa.
• Log in with your student number and password.
• Select the module.
• Click on assignments in the menu on the left-hand side of the screen.
• Click on the assignment number you wish to submit.
• Follow the instructions.
Model answers for Assignments 2 & 3 will only be emailed to students who submit their
assignments by the due date. Make sure that your myUnisa email address is working.
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WEN2601/101/0/2020
Assignment 2 & 3
Assignment 2 and 3 cover the chapters of your study guide. The assignments will probably
require at least 160 hours of study time. Unlike assignment 1, which is a MCQ, for assignments
2 and 3 we are more interested by the method you select in order to solve a given problem.
Important information
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ASSIGNMENT 1
1. The property of fluid that describes its internal resistance is known as ____________
a) Viscosity
b) Friction
c) Resistance
d) Internal energy
2. The force required to drag a small barge ( 3 m × 3 m ) in a shallow canal where the water depth
is 7.5 cm in order to maintain a velocity of 1.5 m/sec. ( Dynamic viscosity is 0.001 N.sec/m2 ) :
a) 1.8 N
b) 18 N
c) 0.18 N
d) 180 N
4. A rectangular block of 2 m long, 1 m wide and 1 m deep floats in water, the depth of immersion
being 0.5 m. If water weighs 10 kN/m3, then the weight of the block is ______________
a) 5 kN
b) 10 kN
c) 15 kN
d) 20 kN
5. An open tank contains 1 m deep water with 50 cm depth of oil of specific gravity 0.8 above it. The
intensity of pressure at the bottom of tank will be ______________
a) 4 kN/m2
b) 10 kN/m2
c) 12 kN/m2
d) 14 kN/m2
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8. Which of the following instruments is used to measure flow on the application of Bernoulli’s
theorem?
a) Pitot tube
b) Orifice plate
c) Venturi meter
d) All of the above
10. A square plate (each side equal to 2 m) with a central hole of diameter 1m is submerged
vertically in water such that the upper edge of the plate is at a depth of 0.5 m from the free
surface. What will be the total water pressure (in kN) on the plate?
a) 15.77
b) 31.54
c) 47.31
d) 63.08
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ASSIGNMENT 2
TOTAL: 100 marks
Question1
Water flows from point A to point D and E as shown in figure 1.1 below. Some of the flow
parameters are known, as shown in the table. Determine the unknown parameters.
A B
Figure 1.1
AB 400 ? ?
BC 700 ? 1.3
CD ? Q3 = 2Q4 1.5
CE 200 Q4 = 0.5Q3 ?
(20 Marks)
Question 2
(15 Marks)
Question 3
Your company is setting up an experiment that involves measurement of flow rate using flow
measuring apparatus and you are to come up with proper instrumentation. Research the
available techniques and devices for flow rate measurement, discuss the advantages and
disadvantages of each technique, and make a recommendation.
(15 Marks)
Question 4
An earth drainage ditch may be approximated a trapezoidal channel has a base width b = 6 m
and side slopes 1H:1V. The channel bottom slope is So = 0.0002 and the Manning roughness
coefficient is n = 0.014. Compute
a) the depth of uniform flow if Q = 6.01 m3/s
b) the state of flow (25 Marks)
Question 5
a) What are the best dimension y and B for rectangular brick channel designed to carry 5.5
m3/s of water in uniform flow with S = 0.0015, and n = 0.015?
(25 Marks)
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ASSIGNMENT 3
QUESTION 1
An inverted U-tube manometer is used to measure the pressure difference between two
pipes A and B, as shown in the figure. Pipe A is carrying oil (specific gravity = 0.85) and pipe
B is carrying water. The densities of air and water are 1.16 kg/m3 and 1000 kg/m3,
respectively. Determine the pressure difference between pipes A and B.
Acceleration due to gravity g = 9.81 m/s2
[20 marks]
QUESTION 2
As an engineering technician, you are required to advice if the tank shown in Figure 2.1 is filling
or emptying? At what rate is the water level rising or falling? Assume that the density is
constant, and all inflow and outflow velocities are steady and constant over their respective
areas.
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WEN2601/101/0/2020
Figure 2.1
[20 marks]
QUESTION 3
An open channel of trapezoidal section has a base width of 3 m and sides inclined at 60 o to the
horizontal. It is found that the normal depth is 0.5 m when the discharge of 3 m3/s. Therefore, as
engineering technician, you are required to calculate the discharge when the normal depth in
[20 marks]
QUESTION 4
A thin 60 cm x 60 cm flat plate is pulled at 3 m/s horizontally through a 3.6 mm-thick oil layer
sandwiched between two plates, one stationary and the other moving at a constant velocity of
0.3 m/s. The dynamic viscosity of the oil is 0.027 Pa s. Assuming the velocity in each oil layer to
vary linearly,
a) plot the velocity profile and find the location where the oil velocity is zero and
b) determine the force that needs to be applied on the plate to maintain this motion.
[15 marks]
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QUESTION 5
5.4 A capillary tube of 1.2 mm diameter is immersed vertically in water exposed to the
atmosphere. Determine how high water will rise in the tube. Take the contact angle at the inner
wall of the tube to be 6° and the surface tension to be 1.00 N/m. (6)
[15 MARKS]
QUESTION 6
A 3 m high, 6 m-wide rectangular gate is hinged at the top edge at A and is restrained by a fixed
ridge at B (Fig. 6.1). Determine the hydrostatic force exerted on the gate by the 5 m high water
and the location of the pressure center. total water height of 2 m.
Figure 6.1
[Total = 15 marks]
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WEN2601/101/0/2020
Refer to your my Studies @ Unisa brochure for general examination guidelines and examination
preparation guidelines.
10 SOURCES CONSULTED
N/A
11 IN CLOSING
Good luck with your studies
12 ADDENDUM
N/A
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