jremington:
This sounds like an interesting experiment. But I'm curious: the flow rate of air over water surface is a major factor affecting the rate of evaporation and as air flow increases, so does wave action. If you suspect that wave amplitude affects the rate of evaporation, how will you separate the two contributions?
I'm using the wave amplitude as an indirect measurement of the wind speed. Using one sensor to do two measurements seemed like a good idea. At this stage I don't know how linear the wave height/wind speed relationship is going to be at the mm scale. Published data is mostly for large bodies of water where wave height is measured in meters, not mm.