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Ok, so I can't use anything suggested so far.
I need to measure the depth of the water when it exits the gutter. This is the data I need.
No, the math doesn't give us what we want. No, I can't simply collect the water and measure it. I'm looking for flow patterns, exactly where water flows and where it doesn't.
I'm sorry I can't fully describe the problem or the environment as it's sensitive and contains proprietary information.
The best way I can describe it is to say that a gutter, much like the one on your house is suspended above an area which must be kept dry. The gutter is at an downward angle (say 3 degrees) which allows water to flow out one end. The environment includes lots of air movement and a deluge of water.
You cannot collect the water at the end of the gutters as you cannot isolate what goes into the gutters and what doesn't. What you need to know is what level the water is at the end of the gutter. Is it 1" deep or is it 1.25" deep?
This is why I'm looking for a paint or something which will wash away from constant water flow, but not wash away from spray.
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