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MT3D aborts with betacf error

Rich Carbonaro

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Has anyone on this forum seen this error from MT3D?

 "error: a or b too big, or MAXIT too small in betacf"

It happened to me 6 hours into an 8 hour model run.  I have tracked this down to a function call to the pearsn subroutine which it turn calls betacf in the Transport Observation Package. The purpose of the function is to calculates statistics on the goodness of fit between model and observed concentrations.  It appears to have nothing to with actual solute transport calculations.   What triggered the error was a slight change to my specified concentration cells.  

Maybe MAXIT in the source code needs to be increased?   Default value is 100 but I'm not sure if this would do the trick.




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