Note:  How to Set a Flap Gate in InfoSWMM

 You can set a flap gate in InfoSWMM either by using the attribute browser and changing the Flap Gate Installed to Yes or No or by using the DB Editor and changing the Flag for Flap Gate Installed to Yes by using the Block Edit tool.   The DB method is better for changing many conduits. 

 via Blogger http://www.swmm5.net/2013/08/how-to-set-flap-gate-in-infoswmm.html