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Determination of Overflow Risk for Stormwater Systems

Mathurin Daynou and Musandji Fuamba (2008)
Ecole Polytechnique de Montreal
DOI: https://doi.org/10.14796/JWMM.R228-02
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Abstract

Stormwater systems (SWSs) are designed for “gravity flow” to convey stormwater runoff. The overflow risk appears when the design rainfall intensity is exceeded, i.e. when systems face rainfalls with short duration and/or high return periods. A two-module (hydrological and statistical) method is developed in this chapter to test the hydraulic performance for a SWS by determining its overflow risk.

The hydrological/hydraulic module selects the critical events: critical rainfalls series from a long recorded rainfall time series, runoff maximal flows (discharges), maximal velocities in conduits and flooding maximal volumes. Afterwards a series of frequency analyses is done with these critical values in the statistical module to determine the SWS overflow risk linked to the 5-, 10- 20-, 50-, and 100-y critical events.

The application of the proposed method to a case study of the Nuns’ Island off the southeast shore of Montreal has shown that the overflow risk of the design storm (rainfall) is not negligible. The studied SWS presents a real flooding risk, depending on the selected time period.

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PAPER INFO

Identification

CHI ref #: R228-02 810
Volume: 16
DOI: https://doi.org/10.14796/JWMM.R228-02
Cite as: CHI JWMM 2008;R228-02

Publication History

Received: N/A
Accepted: N/A
Published: February 15, 2008

Status

# reviewers: 2
Version: Final published

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© 2008 CHI. Some rights reserved.

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Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.

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All papers published in the JWMM are licensed under a Creative Commons Attribution 4.0 International License (CC BY).

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AUTHORS

Mathurin Daynou

Ecole Polytechnique de Montreal, Saint-Hubert, QC, Canada
ORCiD:

Musandji Fuamba

Ecole Polytechnique de Montreal, Montreal, QC, Canada
ORCiD:


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