White Paper

White Paper: New One-Dimensional Implicit Numerical Dynamic Sewer And Storm Model

Source: Bentley Systems, Inc.

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A one-dimensional hydrodynamic numerical model has been developed and implemented into Haestad Methods' hydraulics software for modeling of unsteady flows in sewer and storm water urban drainage system. The new numerical model uses an implicit four-point, finite difference solution technique to solve the one-dimensional Saint-Venant equations. Advanced numerical techniques, such as Local Partial Inertial modification (LPI) for subcritical, supercritical, and transitional flows, and relaxation for pipe/channel networks, are used to achieve computational performance and robustness as required for practical use in a water resources engineering commercial software package