System representations created and employed in AQUARIUS that can include reservoirs, rivers, abstractions, aqueducts, sewers, water demands; hydro-electric, thermal, wind and solar power power stations; transmission lines and nodes, and electricity demands. Used to play back and display the results of system simulations in terms of reservoir contents and releases, river, aqueduct and transmission line flows and losses; electricity generation plant outputs; throughputs, losses and utilisations. Mimic diagrams provide spatial context to simulation results and provide visual information regarding network constraints and potential data errors.