CVEN9611 Urban Hydrology and Environmental Performance

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CVEN9611 Urban Hydrology

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Part 1: Culvert Hydraulics

During your course you inspected the flows through a simple model culvert. Videos of the flow patterns and different flow features are also available on the Moodle course page. These flow observations provide some background on the different flow conditions, but they are not needed for the actual calculations.The culvert is circular with a diameter of D = 57.5 mm. The culvert length is L = 40 cm and you can assume that the culvert material is smooth. The invert of the culvert at the inlet is 35 mm above the bed of the flume and the culvert has a slope of So = 0.025. The culvert inlet is sharp.

In a series of experiments, students measured the water level above the flume bed upstream of the culvert inlet y1 with a pointer gauge for a range of discharges QFlowmeter. The data of these tests are provided in Table 1. You can assume that y1 is equal to the upstream head above the channel bed H1. For all experiments the tailwater level was low.Table 1 Results of culvert experiments
Experimental test number QFlowmeter [l/s] y1 [mm]
1 0.72 84.2
2 1.11 101.9
3 2.12 153.2
4 2.77 202.3
You are required to perform some basic calculations of the discharge through the culvert QCalc and to compare your calculated discharge with the observed values. Your tasks are:
a) Sketch the culvert system to assist your calculations.
b) Calculate the discharge Qcalc for the experiments using the culvert calculation procedures from the lectures.
c) Calculate the error between the calculated discharge Qcalc and the measured discharge from the lab experiments QFlowmeter.
d) Comment briefly on the flow types corresponding to the experimental results.
Hand written assignments are acceptable and preferable if it means that you set out your work more clearly. You can scan your work afterwards and combine with the second part of the assignment into a single PDF document. Include all your calculations and assumptions in the assignment write up.

Part 2: Urban hydraulic structures

1. 10 years ago, in January 2011, the Queensland town of Toowoomba experienced flash flooding leading to the death of several people and large damage. The flood waters surged through the city centre as an “inland tsunami”. Describe the cause and developments of the flash flooding event.
2. Critically review the upgrade of Toowoomba’s urban hydraulic structures in the after mass of the flash flood event in terms of flood mitigation and water sensitive urban design.
3. Pick any small urban catchment; this may be a stream or creek near where you live. Identify urban hydraulic structures and take photos to highlight the interactions of the hydraulic structures with the urban environment. For four of the hydraulic structures discuss briefly the existing features of the structure and any possibilities to improve the environmental performance of the structure.

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