Flow convergence error

[ellie]

Hi,

Can anyone explain to me what is meant by the flow convergence warning?

e.g. WARNING 41071: Flow depth convergence failed 603 time steps at reach "R7920"; maximum convergence error of 0.0381 M.

Are errors of this magnitude (>0.04M) significant enough to require attention and if so, what parameters are influcencing this outcome?

Many thanks,
Ellie.