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Modelling runoff on ceramic tile roofs using the kinematic wave equations.

A Silveira1, J R C B Abrantes2, J L M P de Lima2

  • 1Institute of Science and Technology, Federal University of Alfenas, BR 267 - Rodovia José Aurélio Vilela, 11.999, Campus Avançado de Poços de Caldas, CEP 37701339 Poços de Caldas, MG, Brazil and MARE-Marine and Environmental Sciences Centre, Coimbra, Portugal

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Summary
This summary is machine-generated.

This study validates a numerical model for simulating roof runoff, crucial for designing rainwater harvesting systems. The model accurately predicts runoff volume and peak discharge on ceramic tile roofs.

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Area of Science:

  • Hydrology and Water Resources Engineering
  • Environmental Engineering
  • Sustainable Building Design

Background:

  • Roofs are prime locations for rainwater harvesting (RWH).
  • Accurate assessment of roof runoff quantity and quality is vital for effective RWH system design.
  • Numerical modeling offers a potential tool for simulating roof runoff dynamics.

Purpose of the Study:

  • To evaluate the performance of a kinematic wave-based numerical model.
  • To simulate runoff on sloping roofs, specifically using ceramic tile materials.
  • To compare model predictions against laboratory rainfall simulation data.

Main Methods:

  • Development and application of a kinematic wave numerical model.
  • Laboratory-scale rainfall simulations conducted on a real-scale Lusa ceramic tile roof.
  • Comparison of simulated discharge hydrographs with observed data across various roof slopes.

Main Results:

  • Excellent agreement between simulated and observed discharge hydrographs for all tested slopes.
  • High Coefficient of Determination and Nash-Sutcliffe efficiency values, approaching 1.0.
  • Accurate simulation of key runoff parameters: peak discharges, times to peak, peak durations, and total runoff volumes.

Conclusions:

  • The kinematic wave numerical model demonstrates high fidelity in simulating roof runoff.
  • The model is a reliable tool for predicting runoff characteristics essential for RWH system design.
  • Validated model performance supports its application in optimizing rainwater harvesting strategies.