Drip irrigation set up and working

Thanks to some equipment inherited from my father dating back a couple of decades, plus a recycled submersible pond pump, we now have drip irrigation for our vegetable patch, just in time for the big heatwave.
Here is a snap, with the children's feet into the bargain (they like it but miss playing with the hose pipe!)
After it was all set up and tested, I turned off the pump (situated in one of the rainwater butts) and was surprised to see the water keep flowing: I had not taken into account the siphon action of the system. So strictly the pump is not necessary.