SEWERGEMS FLOW DIVERSION

Question

Hi 
 I am modeling a sanitary system and got the following situation: 
 in the manhole Mh-13 we are going to have a split flow, I run it as implicit but result seems are wrong, as the short pipe shouldn't get more flow that the long pipe Franklin.zip

Jesse Dringoli · Answer

Hello Hamid, 
 I only see the .STSW file in the zip you attached to your post. The hydraulic model data is stored in the .STSW.SQLITE file, so that will need to be included as well in order to open the model. See article below for sending a model file: 
 Sharing Hydraulic Model Files on the Haestad Forum 
 Based on the screenshot, I'm not quite clear on the problem. The flow in the two upstream pipes (45.6 + 5.8) is roughly equal to the flow in the two downstream pipes (29.4 + 22) Could you elaborate on the problem? Are you expecting more flow to go toward the left vs toward the bottom? Tailwater effects and slopes may have an impact there. Plus, you may need to look at a time a few hours into the simulation, after the pipes have filled. (sometimes results in the first hour or so is impacted by this) 
 If you're seeing unstable results at a split, you may need to try a control structure on one or more of the downstream conduits or use the SWMM solver with a small routing step. More on this subject here: 
 Modeling a flow split (diversion) in SewerGEMS or CivilStorm