I have a small pond and loose a couple inches every couple of days; hot hot days I’ll loose that much in an afternoon. I notice that as the water level drops I will start to loose less and I am guessing that I am loosing a fair amount to wicking as well, the folds in the liner are always wet an inch or 2 above the water level. I bought a cheap water timer and have a plan to have it come on for an hour or 2 every day once we get into the steady 90’s. I use a small sprinkler to fill my pond now, get tired of standing around holding the hose. I have to aerator the water because it is toxically high in free iron. Aerating turns it into cheated iron instantly which is safe and my plants get watered at the same time.