Continuity Error

Rohini · #1 (**permalink**) 09-23-2008, 05:22 PM

I have the model with 180 nodes and I am trying to run the model using dynamic wave routing method, but I am getting really high continuity error (flow routing - 19%, quality routing - 9%)

Already I tried reducing the time step, but it didnt effect much.

Also attached is the .inp file, can anyone please look into the model and let me know what needs to be fixed?

Thanks a lot

Debajit Basu Ray · #2 (**permalink**) 09-24-2008, 11:31 AM

Hi,

I reviewed your model and please find attached the model where the continuity errors are as follows:

Surface Runoff = -0.12%
Flow Routing = 0.97%
Quality Routing = 1.25%

I changed the routing time step to 2 seconds which was earlier 10 sec.

Thanks,

Debajit Basu Ray
debajit@bossintl.com

Rohini · #3 (**permalink**) 09-24-2008, 05:07 PM

Thanks a lot for helping with the continuity error.

When I ran my model in epa swmm, I am getting really high head and depth at all the nodes (nearly 800 ft above the actual water head elevation) and when I ran the same model in XP SWMM, I am getting acurate results (stage 790 to 900ft).
Free type outfall condition was used in both the softwares, It would be a great help if anyone could look into the model and suggest the changes needed.

Thanks in advance
Rohini