Environmental Protection Engineering Assignment
Tasks:
You are expected to answer to the questions provided in the following. This assignment
must be written/typed as the answer of the questions. Note that the size of your
answers including figures, tables and critical analysis and discussion is at your discretion
but no more than 10 pages. 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 objective is to design the optimum hydraulic section for maximum
discharge (i.e. minimum wetted perimeter). Use equations 8.19, 8.20 and 8.21
of the reference book to calculate average manning’s n (nAV) to design the crosssection. Also, provide a critical analysis about (a) which of the results obtained
from the above three equations of average manning’s n should be used for your
design and also (b) if you want to change the materials used for construction of
the cross-section to improve the capacity of the waterway (i.e. channel and
flood plain). (mark: 65%)
The following assumptions are considered when designing the cross-section:
a. Capacity of the main channel for base flow is 10 m3/s
b. Capacity of both main channel and flood plain is 50 m3/s
c. Minimum width of the access path is 3 m
d. Maximum depth of the main channel (h1) is 1.5m for safety
e. Maximum width of flood plain is 50m
(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
solution/technique 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%)
