Zero Runoff from Catchment

Question

I tried to build up a run. I don't have area, C, intensity and Tc. However, I got zero flow at every catchment. Why? Help.

Scott Kampa · Answer

Hello Xiaoxiong, 
 
What program are you using? If you are using CivilStorm or SewerGEMS and the Modified Rational Method, try graphing the flow for the catchment and see if there is flow over time. If you are using the Modified Rational Method, the following link has information on using this: communities.bentley.com/.../6809.understanding-the-modified-rational-method 
 
If you are using StormCAD, we may need to see the model files. There are two options for sharing your model on Communities, whichever you choose please be sure to zip your files first. The first option is to attach the zip file containing your model to your reply on the forum using the Advanced Reply Editor (you'll find the link below and to the right of the reply box). If your data is confidential please use the instructions in the link below to send it via Bentley Sharefile. Files uploaded to Sharefile can only be viewed by Bentley employees. Please be sure to reply on this thread with the name of the file after it has been uploaded. 
 
 communities.bentley.com/.../7079.be-communities-secure-file-upload 
 
Regards, 
Scott

MPachlhofer · Answer

Xiaoxiong, 
 
I got the service request that was sent on your behalf and sent you a message through there. When I receive your files and have a look at the problem I'll update this forum thread. 
 
Regards, 
Mark

MPachlhofer · Answer

Xiaoxiong, 
 
It looks like catch basin CB-1 has an invert elevation that is higher than the rim elevation based on the user notifications. If you change that to something lower than the rim elevation such as 467.67 ft. the model will run and you'll get flows from your catch basin. 
 
Regards, 
Mark