How do you render a water wall using watercolor? ?

i have this interior design plate and my plan has got a water wall included in it...i just don't know how to render it on paper....How do you render a water wall using watercolor? ?
It is going to have to have a lot of white (the paper) showing through. The white becomes the reflected light. Painting something like a waterwall is tricky, because you have to show the wall behind the water, while leaving enough white to maintain your reflection.


Because I am not a professional, The way I would handle it, is to paint the outline of the waterwall, then lay in the color where the water is going to be, but VERY dilute, reserving white wavy lines for the water reflection. Then glaze in slightly darker for the wall, making it look like it's moving. Making the lines wavy and non uniform accomplishes this.