I'm new to the stormwater modeling community. I'm currently attempting to build my first model which consists entirely of ditches connected by culverts in places where there is some man-made obstruction to the ditch. I'm having some difficulty with my "courant condition" for some of the open channels (ditches) in my model. I started with a time step of 60 seconds, which produced a courant condition warning for just about every ditch. I've had to reduce the time step to 1 second in order to prevent this warning for all ditches.

Can someone explain what the repercussions of doing this may be or perhaps suggest some other solutions to the problem. Thanks in advance.

Jeff
JThompson@HOBBSUPCHURCH.COM