(a) The watermaster shall maintain an accurate inventory of water in Falcon and Amistad Reservoirs and shall maintain records and institute necessary procedures with the International Boundary and Water Commission as may be appropriate to perform this function.
(b) The watermaster shall timely submit a monthly report to each allottee, or his designated agent, showing the current status of each allottee's account. The period of time covered by each report shall be from the last Saturday of a month at midnight to the last Saturday of the following month at midnight. The report shall designate the date for the end of the watermaster's next reporting period. Each allottee shall apply in writing to the watermaster for correction of any alleged errors in the report within 20 consecutive days following distribution of the monthly report.
(c) A diverter shall request written certification in advance to allow travel time for the released water to reach the river diversion point as scheduled. Each reach of the river shall constitute one day of travel time from Amistad Dam downstream. Whenever there is a flow of water in the Rio Grande in excess of downstream requirements, the watermaster may waive travel time requirements to allow immediate diversions, provided that the diverter shall post the certification at or near his diversion facility.
(d) Nondiverters who have water diverted and transported for them from the Rio Grande by an authorized diverter or carrier shall have the diverter place the order with the watermaster for the amount of water desired. Each diverter or carrier furnishing water to a nondiverter is required to furnish a report within five days of the last Saturday of the month to the watermaster, showing the amount of water in acre-feet delivered to the nondiverter, including transportation losses. If a nondiverter uses in excess of the amount to which he is entitled, the excess amount shall be charged against the account of the diverter.
(e) Diversions shall be charged against the appropriate accounts as follows.
  (1) A diverter shall be charged with the actual amount diverted, without being penalized, if the total diversion is within plus or minus 10% of the amount requested pursuant to certification.
  (2) A diverter shall be charged with 90% of the certification amount if the total diversion is less than 90% of the amount requested pursuant to certification.
  (3) If the quantity of water diverted is more than 110% of the amount requested pursuant to certification, then the diverter will be charged with the actual amount of water diverted and the provisions of §303.31 of this title (relating to General) will apply.
  (4) The watermaster shall have the discretion to waive the penalties contained herein for excessive or inadequate diversions due to circumstances beyond the control of the diverter.
  (5) In accordance with Texas General Law, §2, Chapter 35, 1981, at page 75, water diverted by Maverick County Water Control and Improvement District 1 through its gravity irrigation diversion system that is returned to the stream from which it was taken at specific metered points or places operated by the International Boundary and Water Commission is surplus water as defined in said law and is not appropriated water. For water accounting and reporting purposes, surplus water shall not be counted as a part of the total amount of water authorized to be diverted for beneficial use under the district's water rights. Surplus water does not include water flowing into the Rio Grande from tributaries which flow into the Maverick system.
(f) The burden shall be upon the diverter on the Middle and Lower Rio Grande to satisfy the watermaster that the diverter could not receive his total requested amount of water during the certification period because of the acts of other diverters or because of other clearly shown extenuating circumstances, and if such is shown, appropriate adjustments may be made by the watermaster.
(g) If an allottee on the Middle or Lower Rio Grande has to terminate pumping before the end of the certification period, the allottee shall notify the watermaster as soon as possible. The effect of the termination in pumping is a termination in the certification. A new certification must be issued before the diverter may renew pumping.
(h) Use of no charge water shall not be charged against the allottee's annual surface water use limit or against the allottee's account. The total amount of no charge water diverted must be stated separately in the annual surface water use report sent to the commission.

Source Note: The provisions of this §303.12 adopted to be effective July 2, 1986, 11 TexReg 288