Hey guys, hw's the season treating ya?

I'm considering using a merge between NFT and Raft for my AP set-up where i'd be using NFT Channels but the channels would be filled similarly in the way that the raft is filled with water.
This is simply just to not have to make the big Raft bed
What i wanted to know was how fast does the water flow through the plant beds and the NFT channels? is there a recommended flowrate for optimum plant growth and performance?

Thank you,
Davi