Is there a calculation to figure water usage on a cooling tower?? I have a CVHF 600 ton chiller thats run at 100% daily. The chiller specs are 85 entering, leaving 99.44. 1200 GPM, 12.19 ft. pd. Customer thinks the tower water usage is too much, 17,942 gallons per day. Sounds like alot to me but I guess depending on the wet bulb that would affect the evaporation rate. Any help would be greatly appreciated.