Assessment Task 2

This assessment task contributes 30 percent towards the final mark in this subject.

The due date for this Assignment is 5:00 PM 23rd May 2016. The assignment should be submitted in hardcopy and using the assignment coversheet.

An irrigation engineer is designing a profile for a channel to pass through a farm that is in a shape of a square of side length 25 KM as shown in Fig 1. The proposed profile follows the following equation:

𝑦𝑦 = 𝐴𝐴𝐴𝐴𝐴𝐴𝐴𝐴(π‘₯π‘₯) + 𝐡𝐡𝐡𝐡𝐡𝐡𝐴𝐴(π‘₯π‘₯) + 𝐢𝐢𝐢𝐢𝐴𝐴(π‘₯π‘₯) + 𝐷𝐷π‘₯π‘₯ + 𝐸𝐸

  1. By selecting ideal reference points from the graph determine the values of

arbitrary constants A, B, C, D & E.

  • The turning points for the profile represents the locations where the pumps needs to be installed to distribute the water to the other parts of the farm. Determine the location of the pumping stations to the nearest 0.1 m.
  • Determine the length of the channel.

The channel has x-section in a form of a parabola. The maximum width of the channel at the existing ground level as shown in Figure 2 is 2 meters.

  • Determine the depth of the channel below the existing ground level if the minimum cross section area of the channel is 8 m2 and hence determine the channel profile equation.
  • The excavated earth is used for the embankments alongside the channel. The cross section of the embankments as shown in Figure 2 is in a form of a symmetrical trapezium. The sides of the trapezium is tangential to the excavated channel at the ground level. Determine the height of the trapezium.
  • The maximum safe flow capacity of the channel is when the channel is full up to 0.8 of the full height of the channel. Determine the maximum safe area for the safe flow.
  • To reduce the scouring of the channel and the water seepage, it is suggested to use a lining material to the full height of the channel. If the lining material costs around $50.00 per sq. meter, determine the cost of lining per meter length of the channel.
  • If the cost of excavation is $10 per cubic meter, the cost of constructing the embankment is $15.00 per cubic meter and the cost of lining is $50.00, suggest an alternative profile for the channel x-section with less cost. The only constrains are the overall width of the channel should not be more than 9 meters and the minimum cross section for the water flow is 8 SQM.

Assessment Criteria

CriteriaNot ShownLowMax. MarksMediumMax. MarksHighMax. Marks
Accuracy of CalculationsAccuracy and consistency is not shown in more than 10 operations.Low level of accuracy is achieved. Calculations and results lack accuracy in 5 – 10 operations.5Medium level of accuracy is achieved in some calculations. Inconsistency and accuracy is not shown in 2 – 5 operations.10Very high level of accuracy is demonstrated in ALL calculations. Significant figures and decimal points are used consistently15
Problem SolvingNo evidence is shown for using proper problem solving techniques.Developing evidence on using problem solving techniques. More than two  important assumptions are not stated to achieve the optimum solution of the Engineering10Medium level performance is demonstrated in using problem solving techniques. 1- 2 necessary assumptions are not stated to achieve optimum solution for the Engineering problem20Very high performance in using problem solving techniques and all necessary assumptions are stated clearly to achieve optimum solution for the Engineering Problem30
Use                         of TechnologyNo evidence for using Technology to achieve a proper engineering solutionSome evidence on using technology effectively to achieve an optimised engineering solution is shown.4High performance is demonstrated in using Technology to achieve an optimised engineering solution7An outstanding performance is achieved in using technology to achieve an optimised engineering solution for the problem10
Quality                    of Analysis                            and ConclusionsNo evidence is shownDeveloping performance is demonstrated on analysing and achieving a proper conclusion for the10High performance is achieved on analysing and achieving a proper conclusions using logical and engineering approach20Outstanding performance is achieved on analysing the results and achieving proper conclusions based on solid critical thinking.30
  engineering solution     
Presentation  of the ReportNo evidence is shown for appropriate presentaionDeveloping performance in presenting and communicating the engineering solution5High quality in presenting the report. Most calculations are detailed clearly. Sub headings, graphs and figures are generally presented well and labelled appropriately in most cases. Harvard style method is properly used to reference the bibliography.10Outstanding quality in presenting the report. All calculations are detailed clearly. Sub headings, graphs and figures are well presented, consistently labelled and Harvard style method is perfectly used to reference the bibliography.15

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