See Here for how it was built!
We had only 5mm of rain during this week, one of the hottest days on record for Sept 30.9C and horrible strong winds gusting at nearly 60km/h.
I've only watered these pumpkins at planting, giving them a thorough soaking. They haven't drooped their leaves at all and are rapidly growing away!
I'm already planning more of these beds in other places where tree roots have invaded the Vegetable Garden.
Seems to be the way to go for conserving water