There have been posts of this a while back. In fact one showed a setup with a video he did in his backyard with a tarp and had a box slide set up and it worked very effectively.
High Density Polyethylene (HDPE) Tarps will do the job so I hear without it ripping. You can find a good length, say 20' by 20' for near 100 bucks. Well worth the investment if you're going to use it each weekend or even daily for that matter.
Government - If you think the problems they created are bad, just wait until you see their solutions.
Screw being normal