4" pipe, 15 litres in about 2 sec, or maybe 1 sec.
It nearly took the bucket right out of my hands, and the water went in so quick, some of it came straight back out!
Mini-micro power generation?
I found some more lengths of pipe, catching the water a bit higher up the ditch. I filled a 60 litre bin in 5 seconds. Did it twice to check. Will I put the electricity boys out of business?