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Culvert Drainage Question You are required to designa culvert for a proposed road crossing across a concrete lined stormwater drain. The stormwater drain has a uniform grade of 0.0012 m/m and is approximately trapezoidal in section with a bed width of 8m and side slopes of 1V:1H. The normal depth in the floodway at the design discharge is 0.85 m. Calculate the design discharge in the floodway. You may assume the flow is steady. Pipe culverts, 10 metres long are to be incorporated in the proposed roadway. The culverts will be laid at the same grade as the base of the stormwater drain. The inlet has a precast concrete headwall with square-cut barrels. The culvert needs to be designed such that no excavation of the base or sides of the stormwater drain is required. One (1) metre of the channel base width should be allocated to the headwall and infill required between the multiple culvert barrels, reducing the maximum total width available for the culverts to 7 metres. If the road pavement is to be 1.9 m above the floodway base at the culvert inlet, design a suitable set of pipe culverts to achieve at least 200 mm of freeboard to the pavement level. Standard pipe culvert sizes to be used as per the table on the following page. Your design needs to meet the required freeboard, however your design does not need to be optimised and you may present any culvert design that meets these criteria. Full working should be provided to support your final design. If a number of culvert configurations were trialled before achieving a satisfactory design, provide a brief summary of what designs were trialled before achieving a final design. As part of your assignment submission, include a paragraph reflecting on the adequacy of your design. In particular, your discussion should address: Your rationale for selecting your culvert configuration for testing, The degree to which the freeboard requirement is met, and The afflux above the normal depth that results from the culvert. The design workings and final design should include; Use of any relevant tools and guidelines including identified reference and key information Use of consistent bas units in all working and answers Use of appropriate diagrams to explain workings/design Rigorous investigation undertaken Use key values to make decisions and final recommendation Nominal dimensions of concrete pipe and box culverts Pipe culvents Box culveits D (mm) BxD (mm) 300 300<100 300k150 300<225 375 375<150 375<225 375x300 375<375 450 450<150 450<225 450<300 450x375 450<450 525 600 600<150 600<225 600<300 600-375 600<450 600<600 675 750 750-300 750<450 750<600 750<750 825 900 900-300 900-450 900<600 900<750 900-900 975 1050 1125 1200 1200x300 1200-375 1200x450 1200x600 1200x750 1200x900 1200<1200 1350 1500 1650 1800 1950 2100

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