For the last few years I have used sections of one inch water pipe to construct hooped frames for crop protection netting. This has worked fairly well (sometimes the pests manage to find a way in). One problem I have is the water pipe is flexible, so whilst I can initially construct what looks like a solid structure, over time, the hooped sections of pipe flop over, and tieing canes across the top doesn't help. Once they flop over and down to near the ground, the netting is resting on the crops and it is possible for cabbage whites to lay eggs through the netting, leading to shredded brassicas later in the year. For those who use water pipe for such structures, how do you shore it up so the hooped pipe remains vertical and the whole structure maintains its shape through the year?