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6.3 Temporary Measurement Method: If an accepted Measuring Device or Alternative Measurement Method is incapable of accurately measuring flows, the Division Engineer may allow another temporary Measurement Method until the Measuring Device or Alternative Measurement Method is repaired, replaced, or restored. 6.4 Measurement Method Verification: 6.4.1 If a Measuring Device is properly installed and maintained and has a standard rating table, an adjusted standard rating table or custom rating table accepted by the Division Engineer, or a stage-capacity table, as applicable, the Division Engineer shall presume that the Measuring Device is accurate, and no Verification will be required. 6.4.2 Notwithstanding Rule 6.4.1, the Division Engineer may rate or Verify any Measuring Device or Alternative Measurement Method at any time. 6.4.3 Alternative Measurement Methods shall be rated or Verified every four years beginning on the date the Alternative Measurement Method is approved by the Division Engineer. 6.4.4 All flow measuring equipment used by a Qualified Tester to Verify Measuring Devices or Alternative Measurement Methods must be calibrated according to the following standards: 6.4.4.1 All flow measuring equipment used by a Qualified Tester to Verify pressurized pipe flow meters must be calibrated every two years to be accurate within plus or minus two percent(2%)by a facility using National Institute of Standards (NIST)traceable standards. 6.4.4.2 Calibration of accuracy and maintenance of open channel flow measuring equipment, such as current meters and acoustic velocity meters, must be accomplished by a Qualified Tester or facility using USGS or appropriate manufacturer standards. 6.4.5 A report of the Verification testing shall be provided to the Division Engineer on a form developed by the State Engineer. Rule 7. Approval of Measurement Method To comply with these Rules, each Measurement Method must be approved by the Water Commissioner or Division Engineer. 9