Comprehensive network analysis with time decoupled boundary conditions

A continuum approach to modelling flow conditions for various time scales in a water distribution system is discussed. Boundary conditions such as pumps, in-line valves and surge tanks are decoupled from the transient time step by reformulating the transient problem as two steady-state evaluations. Such a reformation has many potential benefits. For example, using this new algorithm we believe that locations far away from the pump power failure which are not significantly affected by the unsteady flow, could well be modelled under a steady analysis while at the same time areas affected by the pump power failure could be modelled under a full transient solution.