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Multiple Pond Model with Reverse Overflow

I've never had to do multiple pond modeling. So this is a first for me. I actually have a couple questions. 

1. How do you connect a pond outlet  to an Inlet (All of these will be risers)? (Pond 5 needs to overflow into the system using DA-3) .  (Pond 6 should  flow into DA-24.)

2. Why does the model keep crashing when I try to validate it and see the errors? ( I attached the model through the secure link.)

3. The Culverts connecting the two ponds work both forward and backward?  (Pond 2 acts as an overflow for Pond 1 but Pond 2 collects from a water park constantly so there is a chance that pond 2 may need to flow into Pond 1 as some time.)

4. The image attached.  This section has a primary function of collecting water from the gutter and it going to the pond. The secondary is to act as an overflow measure. Once the Pond hits a certain level they are hoping that the pressure from the pond will make the system work in reverse.  The slope of the gutter will lead to a different system if the water pushes in the opposite way. 

I attached the model through the secure link.