Highlights
Objectives
The primary objectives of Task 2 are to undertake detailed assessments of flood scenarios for major and minor storm events and to design a culvert structure for the creek crossing proposed in the concept plan. You are required to use hydrologic and hydraulic modelling software (Mike 11) for detailed assessment of flood scenarios. Estimations from modelling software can be then used in designing the culvert structure for creek crossing so that the safety of the upstream and downstream properties is ensured.
Outline of the Task
1. In Australian industrial practice, undertaking a detailed hydrologic and hydraulic assessment of proposed developments using computer modelling approaches is common. Flood estimations using Rational Method are considered not reliable and only used as a complementary assessment tool. Outcomes of computer modelling provide reliable estimations of flood peaks, water depths and velocities, which are essential parameters to determine safety and sustainability of proposed developments.
2. Designing culverts and bridges for creek crossings are essential tasks in hydrologic and hydraulic assessments for urban developments. In a creek or a tributary, the presence of any form of obstacle (such as a culvert) leads to changes in water levels and flow characteristics. Design of culvert therefore have to take these changes to flow characteristics, their impacts to the development and impacts to the surrounding environment into account. It is required to estimate such changes accurately to facilitate the detailed design of culvert features.
In this project, you are required to setup a Mike 11 model for the catchment and simulate it for design flood scenarios to obtain necessary flow characteristics for design. Design flood scenarios are AEP equivalent to 1 in 10 years (minor event) and 1 in 100 years (major event).
Based on the flow characteristics obtained for AEP equivalent to 1 in 10 years, design a culvert structure to provide a safe passage across the tributary. You should accommodate 500mm freeboard. Developer is in agreement to raise the culvert crown (level of the road centreline) and/or widen the creek cross section to accommodate larger number of culvert elements if necessary. However, you should ensure that the structure is cost effective and environmentally friendly. You are not required to do a detailed calculation on cost, but a simple assessment based on cut and fill is sufficient.
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