Warning Message 79 - Submerged Primary Device Outlet

[tpd67]

I'm trying to fully understand the cause of Warning Message 79 (HydroCADD Version 6.10). I received the following message:

"[79] Warning: Pond M020 Submerged Pond M019 Primary device #1 OUTLET by 0.37'"

This is a closed drainage system. Ponds M020 and M019 are manholes connected by a 12" RCP. As I understand the message, conditions in Pond M020 result in the peak elevation being 0.37' (4.44") above the RCP invert at Pond M019. This means the pipe is about 1/3 full at the peak flow.

Am I interpreting this correctly? What's the problem with this situation?

 

[psmart]

I think your question was also sent to HydroCAD support and answered.

Please do not cross-post. It just takes more time for everyone.