Find the height of a water tank that provides a water flow of 80 feet per second whe the relationship between the velocity and height is given by V=8 with the square root of h?

You are given
  v = 80
  v = 8*sqrt(h)
You want to find h. You can do that by solving for h
  80 = 8*sqrt(h)
  10 = sqrt(h)    (divide by 8)
  100 = h    (square both sides of the equation)

The height needs to be 100.
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We are not told the units. We suspect the height is given in feet.