Freshwater withdrawn and used Freshwater withdrawn and used includes: – imported surface water (water provided by a third party for Rio Tinto use); – on-site impounded water used in process applications; – imported groundwater; – on-site groundwater, except that which is extracted for ground control (dewatering) and discharged without use; and – freshwater withdrawn for use as cooling water, that is chemically, physically or biologically modified at the final point of discharge and/or is returned to the environment with a temperature change of greater than five degrees Celsius.