A cross-section of a compound channel is expected to be designed as shown in the Fig. below. The channel slope is 1 in 500. The specifications of materials in all surfaces are also shown in the Fig. (hint: use the average values for manning’s n).
2025-05-06 14:09:50
BEng (Hons) Civil and Environmental Engineering
Environmental Protection Engineering (TC60033E/ TC6HA33E) Coursework Assignment
Issue date Thursday 20/2/2025 Deadline for submission Thursday 8/05/2025
Weighting 60% of coursework (30% of total mark)
Tasks:
You are expected to answer to the questions provided in the following. This assignment must be written/typed as the answer to the questions. Note that the size of your answers including critical analysis and discussion (excluding figures, tables, and references) is at your discretion but no more than 2000 words. Other materials (e.g., supporting documents, calculations, or other figures/tables) can be placed in the appendices. You can also support your answers by evidence-based analysis and synthesis of issues raised in the assignment task. You can also analyse the data by means of graphs and tables in MS Excel software.
Please bear in mind that similarity will be strictly checked by the module leader/examiner and Turnitin software tool once you submit your assignment.
Assessment criteria/Marking scheme:
They are based on the breakdown provided in the module study guide (MSG). The weighting of the marks is given for each task, separately.
Submission:
This assignment needs to be submitted to Turnitin before the deadline. You will find a link to the Turnitin Assignment from the Assessments area of the Blackboard course menu. You will need to ensure that your assessment is uploaded as a single document, and in the correct format (e.g., a Word document or PDF – the acceptable file formats are displayed on screen when you come to submit via Turnitin). You should refer to Module Study Guide for further information and regulation of submission through Turnitin. Also, please note that similarity will be strictly checked by Turnitin software tool once you submit your report.
A cross-section of a compound channel is expected to be designed as shown in the Fig. below. The channel slope is 1 in 500. The specifications of materials in all surfaces are also shown in the Fig. (hint: use the average values for manning’s n).
(1)The purpose is to design the optimum hydraulic section for maximum discharge (i.e., minimum wetted perimeter). (mark: 65%)
- Use equations 8.19, 8.20 and 8.21 of the reference book to calculate average manning’s n (nAV) to design the cross-section and critical analyse which of the results obtained from the above three equations of average manning’s n should be used for your design and
- Critically analyse and discuss to improve the environmentally acceptable aspects of the channel while keeping the capacity of the waterway.
The following assumptions are considered when designing the cross-section:
- Minimum Capacity of the main channel for base flow is 10 m3/s
- Minimum Capacity of both main channel and flood plain is 50 m3/s
- Minimum width of the access path is 3 m
- Maximum depth of the main channel (h1) is 1.5m for safety
- Maximum width of flood plain is 50m.
Max. 50 m Stones 75-150mm diam.
Poor alignment
(2)The capacity of both main channel and flood plain in part 1 is calculated based on the peak value of the hydrograph of the flood runoff with a return period of 100 years in the upstream river catchment. If the results of the climate change shows that the aforementioned peak value is likely to increase by 20% in the future (i.e. by the next 20 years), critically analyse/discuss any innovative technique based on environmentally friendly solutions for dealing with this situation. You can support your statement with numerical calculations and cost-effective analysis. Your solution can be linked to a wide range of potential options e.g. the change of the suggested cross-section or change in the subcatchment upstream. (mark: 35%)
Assessment criteria:
The following criteria grid is used for the assessment of the assignment.
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Criteria
|
Issues
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Mark (100
marks)
|
|
Application and Understanding
(40%)
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Clear understanding and analysis of the problem given. Application of correct mathematical concepts.
Clearly demonstrate the methodology and clear understanding.
|
20
20
|
|
Result and Outcome: Style and structure (60%)
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Correct result obtained.
Critical analysis/discussion of the problem.
Correct use of standard mathematical conventions (symbols, signs, formulae, labels etc.) Working and methods clearly shown.
The use of appropriate language and expression within the work to
convey ideas and arguments.
|
20
20
10
10
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Marking:
The assignment will be marked according to the standard marking grid. General Marking Scheme is as follows:
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%
|
Descriptor
|
|
86 -
100
|
The standard achieved is exceptional and the work provides clear evidence that the knowledge, understanding and skills are at a level appropriate to the level of study. There is evidence showing that all the learning outcomes appropriate to that level are achieved with many at an exceptional standard.
|
|
76 - 85
|
The standard achieved is outstanding and the work provides clear evidence that the knowledge, understanding and skills are at a level appropriate to the level of study. There is evidence showing that all the learning outcomes appropriate to that level are achieved with many at an outstanding
standard.
|
|
70 - 75
|
The standard achieved is excellent and the work provides clear evidence that the knowledge,
understanding and skills are at a level appropriate to the level of study. There is evidence showing that all the learning outcomes appropriate to that level are achieved with many at an excellent standard.
|
|
65 - 69
|
The standard achieved is very good and the work provides clear evidence that the knowledge, understanding and skills are at a level appropriate to the level of study. There is evidence showing that
all the learning outcomes appropriate to that level are achieved with many at a very good standard
|
|
60 - 64
|
The standard achieved is good and the work provides evidence that the knowledge, understanding and skills are at a level appropriate to the level of study. There is evidence showing that all the
learning outcomes appropriate to that level are achieved with many at a good standard
|
|
55 - 59
|
The standard achieved is satisfactory and the work provides evidence that the knowledge, understanding and skills are at a level appropriate to the level of study. There is evidence showing that
all the learning outcomes appropriate to that level are achieved with many at a satisfactory standard
|
|
50 - 54
|
The standard achieved is acceptable and the work provides evidence that the knowledge,
understanding and skills are at a level appropriate to the level of study. There is evidence showing that all the learning outcomes appropriate to that level are achieved mostly at an acceptable standard
|
|
45 - 49
|
The standard achieved is acceptable and the work provides evidence that the knowledge, understanding and skills are at a level appropriate to the level of study. There is evidence showing that all the learning outcomes appropriate to that level are achieved though quite a few are only achieved
at a basic standard
|
|
40 - 44
|
The standard achieved is basic and the work provides evidence that the knowledge, understanding and skills are at a level appropriate to the level of study. There is evidence showing that all the
learning outcomes appropriate to that level are achieved mostly at a basic standard
|
|
35 - 39
|
The standard achieved is weak and the work provides evidence of insufficient knowledge,
understanding and/or skills appropriate to the level of study, although some of the learning outcomes appropriate to that level are achieved
|
|
30 - 34
|
The standard achieved is very weak and the work provides evidence of insufficient knowledge, understanding and/or skills appropriate to the level of study. The evidence shows that some of the learning outcomes appropriate to that level are achieved OR that none is achieved but there is
evidence that many of the learning outcomes may be almost achieved.
|
|
20 - 29
|
The standard achieved is unacceptable and the work provides little evidence of the knowledge, understanding and/or skills appropriate to the level of study. The evidence shows that few, if any, of the learning outcomes appropriate to that level are achieved.
|
|
10 - 19
|
The standard achieved is unacceptable and the work provides very little evidence of the knowledge,
understanding and/or skills appropriate to the level of study. The evidence shows that very few, if any, of the learning outcomes appropriate to that level are achieved.
|
|
0-9
|
The standard achieved is unacceptable and the work provides negligible or no evidence of the
knowledge, understanding and/or skills appropriate to the level of study. The evidence fails to show that any of the learning outcomes appropriate to that level are achieved.
|
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