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Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
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Inlet modifications for increased box culvert capacity: a numerical modelling approach.

Thea Maria Dorothea Giliomee1, Ione Loots2, Marco van Dijk2

  • 1Department of Civil Engineering, University of Pretoria, Lynnwood Road, Hatfield, Pretoria, South Africa

Water Science and Technology : a Journal of the International Association on Water Pollution Research
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Summary

Optimizing culvert inlet structures with headwalls and wingwalls significantly boosts stormwater drainage capacity, enhancing flood resilience. Rounded edges also improve flow, offering sustainable solutions for larger flood events.

Keywords:
CFDcomputational fluid dynamicsflood controlhydraulic capacityhydraulic structuresstormwater drainage

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Area of Science:

  • Civil Engineering
  • Hydraulic Engineering
  • Environmental Engineering

Background:

  • Culvert inlet modifications can enhance stormwater drainage capacity, crucial for adapting to increased flood events.
  • Headwalls and wingwalls are established retaining structures, offering potential for optimization.
  • Previous physical modeling research provides a foundation for further investigation into inlet designs.

Purpose of the Study:

  • To evaluate a wider range of headwall and wingwall angle combinations for optimizing culvert inlet capacity.
  • To compare the performance of optimized headwalls and wingwalls against rounded-edge box culvert inlets.
  • To quantify the hydraulic improvements offered by inlet modifications under inlet control conditions.

Main Methods:

  • Utilized numerical modeling to optimize wingwall and headwall configurations and rounded-edge inlets.
  • Quantified the discharge capacity improvements resulting from various inlet modifications.
  • Verified numerical results against established hydraulic references and guidelines.

Main Results:

  • A 15° headwall with a 15° wingwall improved box culvert flow by up to 34% at a headwater depth of 2D (twice the culvert height).
  • Rounded-edge box culvert inlets showed a maximum improvement of 30% at a headwater depth of 2D.
  • The 15° headwall/15° wingwall combination demonstrated the best balance of hydraulic performance and practical implementation.

Conclusions:

  • Inlet modifications, particularly specific headwall and wingwall angles, offer a sustainable and effective method to increase culvert discharge capacity.
  • Optimized inlet designs can significantly mitigate flood risks by improving stormwater drainage system performance.
  • Rounded-edge inlets provide a notable improvement, though optimized wingwalls and headwalls show greater potential for capacity enhancement.