leak or evaporation
I live in Canada and have noticed that I am losing about 4" water in a 9L x5W x5D pond over night. I have a pond heater running and the past few days it has been between -10 c to -16c without wind chill. The fish are still active ! there is a cold steam coming off the pond but is it possible this water loss os down to evaporation? would it help to put a tarp over the pond ? I am having to fill this up every night ! I cant see any splits in the liner and I would expect the liner to be deformed with all that water under it if it was leaking and as the ground is frozen I don't think it would soak away. So is it possible to lose that much water everyday through evaporation ?