(a) A person who owns and operates a system of waterworks used for a purpose authorized by this code shall keep a detailed record of daily operations so that the quantity of water taken or diverted each calendar year can be determined.
(b) If the water is used for irrigation, the record must show the number of acres irrigated, the character of the crops grown, and the yield per acre. No survey is required to determine the exact number of acres irrigated.
Official text of the Texas Water Code as published by the Texas Legislative Council.