Abstract
Below-ground structures provide special challenges to the designer of drainage systems, particularly if odour ingress is to be prevented to generally accepted standards. It is insufficient to rely on entrained airflow to ensure that the network is generally at below atmospheric pressures; fan-assisted venting is often required. Transient propagation as a result of both system appliance discharge and the operation of a fan-assisted vent system needs to be analysed to avoid system failure. This paper presents the necessary solution to the governing St Venant equations to allow system simulation. The basis for a numerical simulation is presented and the boundary conditions particular to this class of installation are identified.
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