We are not sure who needs to hear this, but we'll just go ahead and say it anyway: they're called waterslides, not water stairs. In other words, people need to be able to slide down water slides. If you have a bunch of steps inside the waterslide, people aren't going to be able to slide down the waterslide. It really isn't that difficult. It is not rocket science. It's just a waterslide.
You'd think that a person who's building a full-blown waterpark would understand the basic concept of a waterslide, but apparently not. Maybe that's just too much to ask of a waterpark designer.