Modelling of Urban Storm Sewer Systems
The paper describes a software system for computer aided analysis and design of urban sewer systems. The software system consists primarily of two database systems, a computational module and an expert module. The system is designed and developed especially for microcomputers.
The system includes a database for catchment description, a database for historical design rain events, computational modules for runoff and pipe flow modelling and routines for graphical presentation of input and output data. The system is operated through a user-friendly menu interface.
The generalized pipe flow model encompasses a fully dynamic module for accurate simulation of surcharge conditions and backwater effects. This module uses very advanced numerical methods in the solution techniques.
In general, simulation with advanced numerical models requires a high level of specific knowledge about the algorithms used, for example for determination of the model discretization. Without such specialist knowledge the user will often encounter problems relating to the numerical stability of his simulations.
By applying an expert module, which is included in the software system, the discretization is automated and in case of numerical ‘blow-up’ the user is guided by the expert module to solve the problems. These facilities ensure that the system can be used by persons with a minimum of computer experience.
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