Polysurface water flow analysis

Hi everyone,
I have only one surface. I want to get a polysurface using this surface with evenly spaced lines (red curves). Because I’m going to do water analysis using these surfaces.

I lofted these curves one by one on the rhino. I had defined my water flow code one by one on the resulting surfaces. Is there an easy way to do this?

I want to do; Separating a single surface as I want in grasshopper and having water flow analysis done for each surface that comes out.

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