I think it's a general rule of thumb ? the force of the water will not allow you to walk through if it is over your knees.

The moving water creates a lot of force and it will push somebody up into an area where they can't get out. If somebody's in the water and the water's moving usually they don't realize there's a problem until they're actually in trouble.

Some of the water will find its way into our reservoir system. It's not going to be any big deal.

Gutta cavat lapidem, non vi, sed saepe cadendo. - A drop of water hollows a stone, not by force, but by continuously dripping

The force is really strong. Imagine 500 gallons of water coming out at once. The pressure is unimaginable.

The nano-particles in the coating strongly attract the water droplets and force them to form much smaller contact angles with the surface,