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Hammer: Pelton free-surface tailrace surge

Hi

I am currently modelling a number of pelton hydro station layouts. One option may (to be confirmed) include a tailrace tunnel with a free surface. Because the tail race tunnel is so long, surges upon start-up are a concern as could flood the pelton wheels. One scenario is to include a free-surface tailrace tunnel, allowing free-board for surges. Is it possible to model this situation in hammer, where under surge the tunnel may become pressurised? If so, how do I go about this?

Thank you for any assistance.