That said the flood test shows us that the shower under "Worst Case" Scenerio holds tight. This is whyy we flood them for three days to be sure.
An Evaporation control is another dish or pan with water in it. Measured the same way. A small coffee cup will evaporate at the same rate as coffee can full of water. A bread loaf pan the same rate as the shower. I have a little fishing tool box I use now as the control.