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Sewsan is a comprehensive computer program for the simulation, analysis and optimal design of sewer reticulation systems. The program uses the theory of contributor hydrographs for analysis and time simulation to determine the spare capacities in sewer systems taking cognisance of infiltration and leakage.

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Introduction

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Sewsan is a computer application to simulate and analyse flow through sanitary sewer systems. The hydraulic simulation is based on the contributor hydrograph method. The contributor hydrograph for each pipe is made up of the following flow components:

  • The local inflow to the pipe defined by the number and type of unit land parcels served by the pipe.
  • Storm water ingress
  • Infiltration
  • Leakage

The hydrographs generated by each pipe are accumulated and routed downstream using time-lag routing. Bottlenecks in the system are identified at structures (manholes) where overflow occurs.

The Sewsan system is an analysis tool coupled to a CAD interface. All the model entities (pipes, manholes etc.) are stored in an internal database, and are displayed in a CAD drawing. The system data and results can also be viewed in tabular format in spreadsheets. Sewsan therefore consists of the following components:

  • The sewer model representing the physical components of the sewer system
  • Data and result tables
  • The CAD interface

The program is extremely user friendly, with a menu driven structure and easy-to-use-and-understand interface between the graphical display/edit model, and the model database and results.

Sewsan is available in 3 modules:

  • A basic Capturing Model, which allows the user to capture the sewer network and check the integrity of the model.
  • An Analysis Module in which the flow through the system can be simulated and the results of the simulation viewed. Bottlenecks in the system can be identified and the resulting overflow calculated.
  • A Planning Module, which can be used to estimate required pipe diameters where bottlenecks in the system occur, pump capacities and rising main capacities.

Sewsan has been used for sewer system analysis and planning by GLS Consulting and other consultants in more than 50 major applications. Some of the more significant projects are:

  • City of Tshwane
  • City of Cape Town
  • City of Johannesburg
 
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