Has anyone seen anything where you can start with a series of half tubes and connector type things that kids can connect together to make different water courses? (A bit like kids versions of the tubes that plumbers use - I had thought about using these but run out of time to try and cut them in half see if it works).

Am not looking for a water table - we don't have room, would like something that can put in a bag and take to the beach, and then construct with.

(I have to admit this present would be half for me, as I get bored on the beach and we spend most of the time making dams and pools and I thought it would be fun to enhance this).