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Current Issues on Modeling Extreme Inflows in Stormwater Systems

Jose Vasconcelos, Steven J. Wright and Philip L. Roe (2006)
Environmental Sanitation Co. of the Federal District CAESB; University of Michigan
DOI: https://doi.org/10.14796/JWMM.R225-19
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Abstract

The increasing availability of different numerical models to simulate flow in storm sewers has raised several questions on the applicability of these models in the simulation of extreme inflow conditions. These issues include accurate modeling and prediction of bores, flow regime transition into pressurized flow and the possibility of air pocket entrapment and the subsequent effect on the system.

With regards to bore description, the issue is not limited to the choice of equations for the problem solution, but includes the selection of numerical schemes that will ensure the correct bore propagation speed. It will be shown that the selection of the variables used to solve the mass and momentum equations has an impact in the solution of discontinuous flows. It will also be seen that numerical models without shock-capturing capabilities have limited ability to model flow discontinuities.

Flow regime transition models can be divided into shock-fitting or shock-capturing approaches, each group of approaches with particular strengths and limitations. Due to the popularity of Preissmann slot-based models, including the soon-to-be released SWMM 5, a more detailed discussion on the issues of this approach is provided. Some new model improvements to shock-capturing approaches are presented, including a new conceptual model for simulating sewer surcharging referred to as the Decoupled Pressure Approach.

Finally, some of the current challenges in the incorporation of the air phase in the computation of the rapid filling pipe problem are considered. These challenges include the limitations of the one-dimensional framework, difficulties of dealing with boundary conditions for the air phase and the possibility of incorporating the air phase in either a two-phase flow or a sub-model framework.

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PAPER INFO

Identification

CHI ref #: R225-19 878
Volume: 14
DOI: https://doi.org/10.14796/JWMM.R225-19
Cite as: CHI JWMM 2006;R225-19

Publication History

Received: N/A
Accepted: N/A
Published: February 15, 2006

Status

# reviewers: 2
Version: Final published

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© 2006 CHI. Some rights reserved.

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

The Journal of Water Management Modeling is an open-access (OA) publication. Open access means that articles and papers are available without barriers to all who could benefit from them. Practically speaking, all published works will be available to a worldwide audience, free, immediately on publication. As such, JWMM can be considered a Diamond, Gratis OA journal.

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

JWMM content can be downloaded, printed, copied, distributed, and linked-to, when providing full attribution to both the author/s and JWMM.


AUTHORS

Jose Vasconcelos

Environmental Sanitation Co. of the Federal District CAESB, Brazil
ORCiD:

Steven J. Wright

University of Michigan, Ann Arbor, MI, USA
ORCiD:

Philip L. Roe

University of Michigan, Ann Arbor, MI, USA
ORCiD:


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