Perf-Q

From the Perf-Q web site:

Performance-Q ג€“ Perf-Q for short ג€“ is a water quality model applicable to drinking water transmission and distribution systems. It is based on an event-driven advection and mixing model, and includes the capability to simulate the propagation and transformation of physico-chemical and microbiological parameters throughout water networks.

Perf-Q uses Epanet standard script input files to perform a complete hydraulic and water quality extended-period simulation. It models chlorine (free and combined), suspended bacteria, organic matter and travel time, taking account of such ambient variables as pH, temperature and pipe biofilm load. The event-driven Lagrangean advection and mixing model provides a basis for taking account of all such parameters and variables simultaneously and model their transformation taking into consideration both their inter-relationships and the influence of hydraulic variables such as flow velocity.

For a free download and a manual see Perf-Q web site.