You have a growing slip and slide in your backyard that incorporates tarp :)
The first attempt consisted of two slip and slides put together going down our hill. As you can see, the kids were flying right off the bottom and getting grass burn on their bottoms :) 
The solution became a tarp at the bottom, which we found was just an extension of the slip and slide, and they would still get enough speed up to go right off the end.
Splash!!
So, the solution became adding multiple tarps, which worked beautifully!
This way it was even able to support adults :) WEEEEEEE!!!!!
