Whaow, thanks very much!

I though I'd tried adding and removing some C lines to see which was
mandatory, but I guess I must have just missed that one ( as is usually
the case)! I got a nice error message then from not inputting my I lines
:

"===> A @#$!@#@ error in your input was found,
the simulation will end for the following reason.
0$$$$$$$$$$ SIMULATION STOPPED DUE TO Error(S)IN SNOW MELT INPUT DATA
GIVEN ABOVE."

Well I'll now remember to always put in my I lines, that's for sure! And
thanks for the info about the I lines too! I've now replaced the C2
line, put some parameters in the I lines, and it works fine!

Alex.