Hello, So I have this 27'x37' yard where I'm trying to add a sprinkler system. I've read several article and saw a post where this guy did a DIY sprinkler system for his yard. he used Flex PVC pipes for his system. after seeing that I got motivated to convert my existing system (garden hose and walmart stake type sprinklers) to a slightly better one where I don't need to stand and watch. I bought some Orbit timer and just need to run some pipes in two spots and some heads. so here's what I'm thinking, run some standard PVC (since they're much cheaper than flex pvc) to two spots that I've determined and bury the pipes probably 6" in the ground with shovel or whatever tool I can use. the parts that I haven't figured out yet is, how am I going to connect the water line to the pvc from my outside water tap. how do I prevent backflow and how do I drain the water out before winter. please feel free to comment on my existing plan and help with this diy plan. your comments are greatly appreciated. Thanks.