Water and wastewater recovery facilities offer a unique set of modeling challenges. Moving water through a treatment plant includes a mix of flow diversions, flow splitting, free surface and pressurized pipe flow conditions, with head loss and detailed velocity fields all important modeling outcomes. Other process modeling challenges include aeration, hindered settling, chemistry, and impeller motion. FLOW-3D HYDRO‘s advanced auxiliary models allow modelers to go beyond the hydraulics of the flow. Grit removal, chlorine contact tanks, sludge settling and aeration all have their own dedicated models and give the user full flexibility into choosing the level of sophistication of their modeling effort. With its TruVOF capabilities, FLOW-3D HYDRO can seamlessly handle a range of free surface pressurized flow conditions.