polytunnel external drainage. Where does all the water go?

This could be a design and construction question. I have already asked for advice on land drains, ditchs etc in that forum. Received great ideas on drains, pipes etc.

Specific to poly tunnels. When it rains and the water bounces down the sheeting  does it cause excessive flooding bogginess to the ground either side of the tunnel? If this is the case what mechanisms do tunnel owners use to ensure the water flows away/ is captured to prevent flooding problems occurring.

I am making my own only small tunnel. Hoops are up with extra supports, raised beds nearly in, trenchs dug either side to bury sheeting for stretching over etc. But the ground in Autumn winter is always boggy in the plot and getting rid of water in the ground in that spot will be a priority.

Tips please.

I echo GrannieAnnie's reply completely and would add that if drainage is a problem, you could perhaps install a soakaway in the form of some pea shingle around the perimeter of the polytunnel on top of the buried sheeting. Or you might be able to rig up a harvesting system for rainwater either by purchasing something like this GUTTERING or by making your own.

Oh well, if you'd already had all the ideas yourself, at least if we pushed you in the right direction.....