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Developed for almost 40 years, our 1D solver has become one of the fastest and most robust solutions available, making it an ideal choice for flood modelling applications.

1D Unsteady State Solver

The unsteady simulation solver employs the Preissmann implicit scheme to solve the equations for free surface flow, based on the Saint-Venant equations for flow in open channels. These are used in conjunction with the governing hydraulic equations for each hydraulic structure.

Flood Modeller Pro provides various features which have been specifically designed to improve model performance and management capabilities, during an unsteady simulation.

These equations are inevitably a combination of empirical and theoretical equations, many of them non-linear. The non-linear equations are first linearised and the solution to the linear form of the problem is then found.

In order to carry out unsteady simulations an estimate of the initial conditions (flow and stage) are required at every model node. This is most often obtained by carrying out a steady state run at the proposed start time.

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