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Related Concept Videos

Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

Design Example: Analyzing Capacity Contours for Flood Risk Assessment

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...
Applications of GIS: Disaster Management and Emergency Response01:29

Applications of GIS: Disaster Management and Emergency Response

Geographic Information System (GIS) technology is essential for risk identification, action prioritization, and resource optimization in critical situations like flooding and earthquakes. By integrating spatial and demographic data, GIS provides a comprehensive framework for emergency response.GIS integrates data layers, like rainfall intensity, topography, elevation profiles, and river levels, to model high-risk flood zones. These layers assess areas susceptible to flooding based on their...
Design Example: Creating a Hydraulic Model of a Dam Spillway01:21

Design Example: Creating a Hydraulic Model of a Dam Spillway

Scaled hydraulic models of dam spillways provide a practical way to replicate and study the intricate flow dynamics of these structures. Often built to a 1:15 ratio, these models allow for observing critical water behavior, such as velocity distribution, flow patterns, and energy dissipation.
Underflow Gates01:30

Underflow Gates

Underflow gates are vital for controlling water flow in irrigation canals. The three main types of underflow gates — vertical, radial, and drum gates — serve different purposes while ensuring effective flow management. Vertical gates move up and down, generating a free-flowing water jet; radial gates pivot to regulate the flow; and drum gates rotate for precise adjustments. The flow through these gates is influenced by downstream conditions, resulting in free or drowned outflow.Free and Drowned...
Typical Model Studies01:30

Typical Model Studies

Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
Responses to Drought and Flooding02:41

Responses to Drought and Flooding

Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.

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Related Experiment Video

Updated: Jun 23, 2026

Design and Construction of an Urban Runoff Research Facility
13:48

Design and Construction of an Urban Runoff Research Facility

Published on: August 8, 2014

Fault tree analysis for urban flooding.

J A E ten Veldhuis1, F H L R Clemens, P H A J M van Gelder

  • 1Department of Water Management, Delft University of Technology, Delft 2600 GA, The Netherlands. j.a.e.tenVeldhuis@tudelft.nl

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|May 1, 2009
PubMed
Summary

Urban flooding is often caused by blocked gully pots, not just storms. This study shows clearing drains is more effective than upgrading drainage systems for reducing flood risk in cities.

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Design and Construction of an Urban Runoff Research Facility
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Published on: May 15, 2017

Area of Science:

  • Urban Hydrology
  • Risk Assessment
  • Environmental Engineering

Background:

  • Traditional flood risk assessment often overlooks minor causes, focusing primarily on extreme weather events.
  • Fault tree analysis (FTA) offers a comprehensive method to model and quantify all potential flood triggers.
  • Understanding the specific causes of urban flooding is crucial for effective mitigation strategies.

Purpose of the Study:

  • To develop and apply a fault tree model for assessing urban flood risk.
  • To quantify the probability of flooding in a specific urban area (Haarlem).
  • To determine the relative contributions of different causes to urban flood incidents.

Main Methods:

  • Development of a fault tree model tailored for urban flooding scenarios.
  • Integration of diverse data sources: complaint registers, rainfall data, and hydrodynamic model outputs.
  • Quantification of probabilities for basic events within the fault tree to derive overall flood probability.

Main Results:

  • The study established an urban flood probability of 0.78 per week for Haarlem.
  • Gully pot blockages were identified as the primary cause, contributing to 79% of flood incidents.
  • Storm events were found to contribute only 5% to the overall flood incidents.

Conclusions:

  • For Haarlem, enhanced gully pot cleaning presents a more effective strategy for reducing flood probability than increasing drainage capacity.
  • Further research is needed to conduct a cost-benefit analysis comparing different flood mitigation strategies.
  • The fault tree analysis provides a valuable framework for prioritizing urban flood risk management interventions.