Hey I have a 500-600 gallon pond. Has a two channel waterfall. Long story short when the waterfall is off the water level does not move. When waterfall is on water level slowly lowers everyday. I did a thick coat of hydraulic cement on both channels coating the sides as well. Studied how the water flowed to see if any was splashing out etc. Water flow seemed to be contained in the waterfall channels. I did notice, however, the front face of the concrete foundation slab that waterfall sits on the right side appear to be wet while the left is dry. So studied the right side and I just can't figure out where the water could be escaping. Doesn't seem that the right channels water is splashing up hitting the front of the foundation slab causing it to appear wet. I cannot take the waterfall apart without completely destroying it. I don't know if there's an easy fix or what. I don't mind filling the pond back up to level every week but I don't want to keep disturbing the ponds chemical balance etc. Any thoughts or solutions would be greatly appreciated!