Drainage Design - Allowable Headwater (AHW) - Report Writing - Engineering Assignment Help

ASSIGNMENT TASK:

Assessment Description:
You are required to provide a short report that involves relevant topics of the Drainage Design section of the course. Through this assessment item, your competency about the learnt components of a typical drainage design project is evaluated.

Tasks description:

Task 1 (~15%):
Design a concrete pipe to drain the major road shown in Figure 1. Assume a design discharge of 280 L/s and longitudinal slope of 0.3 %. How much is the capacity of the pipe? How much should be the selected AEP?

Task 2 (~15%):
Design a concrete channel to carry the same discharge. Discuss the pros and cons of channel and pipe and draw the cross section of both.

Task 3 (~20%):
Design an earthen channel to carry a flow of 28 m 3 /s just before the crossing of the abovementioned channel and major road (Figure 2). Assume a non-maintained trapezoidal section, a side slope of 1V:3H in an easily erodible, 38% vegetated soil with clean bottom and brush on sides. Discuss the pros and cons of the earthen channel compared to the concrete one. How much should be the selected AEP?
Task 4 (~50%):
At the intersection of the above-mentioned road and the channel, a culvert system (longitudinally shown inFigure 3) is required. Design the configuration of the required standard pipe culvert(s) and provide the drawings 2 based on the information given below. As a summary of your calculation steps, fill the relevant parts of the attached design calculation form and insert in after the last calculation in this part. The road width is 12 m, its crown elevation is 125.65 m and its cross fall (crossroad slope) is 2.5%. The Allowable Headwater (AHW) is 18 cm below the shoulder height to avoid any potential damage. The inlet invert height is 122.85 m. Downstream of the culvert, the maximum allowable velocity is 1.8 m/s. The culvert is 28 m long and needs to be made of reinforced concrete with a height limit of 2.5 m. The culvert entrance type is groove end with headwall and there is no chance of blockage. What do you recommend for the downstream protection? Provide the details if protection is required. Furthermore, check your design for an extreme event (AEP=1%) with 10% more discharge. Pros and cons of the design option need to be discussed.

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