Atstartofsimulation
– Poor initial conditions - steady run, unsteady with steady lead-in
period
• Atanytime:
– Time or distance step too coarse
– Incorrect data: typing, ‘raw’ data - use graphics and view data file
– Noisy or erroneous boundary data
– Inappropriate parameters: roughness, coefficients
– Dry channels: min water depth, Pressman slot Notional Weir
– Supercritical flow: check data, use simplifying method
– Indeterminacy: two closed sluices gates