Standards, Specifications and Guidelines

STANDARDS, SPECIFICATIONS AND GUIDELINES: Each meter shall be of a type acceptable to the State Engineer and shall be installed, maintained and repaired to be operational in a manner that is acceptable to the State Engineer.  A list of acceptable meters is available on the OSE website.  Each meter shall meet the following minimum standards:

A. The meter shall be a totalizing flow meter with a rated accuracy of plus or minus two (2) percent of actual flow. The installed accuracy of the meter and any secondary equipment such as data recorders shall be within plus or minus ten (10) percent of actual flow. The meter shall be factory calibrated or calibrated according to industry standards upon installation, and shall be tested for accuracy or re-calibrated at least once every three years thereafter.

B. The meter shall be installed, inspected, maintained and repaired according to the manufacturer's specifications.

C. The meter shall contain sufficient recording digits to assure that "roll over" to zero does not occur within a one-year period.

D. The meter register or display shall record total volume and instantaneous flow rate or be capable of flow rate calculation, be non-resettable, and have a waterproof and tamperproof seal.

E. There shall be no diversions between the wellhead and the meter.

F. The meter shall be installed and maintained in such a manner as to prevent meter error, for example, due to the pipe being incompletely filled with water at the location of the meter.

G. The meter shall be installed and maintained in such a manner as to prevent meter error due to the meter being too close to obstructions in the discharge pipe, such as valves, pumps, bends in the pipe or changes in pipe inner diameter. The meter shall be installed at a distance of at least 10 pipe diameters downstream, and at least five pipe diameters upstream from obstructions to flow, unless manufacturer's installation instructions specify a shorter minimum run of straight pipe.

H. The meter shall be accessible for reading, inspection and testing by a representative of the State Engineer.

I. The units of measurement and the multiplier, if any, for determining the total amount of water diverted shall be indicated on the meter.

The Measurement Specifications adopted by the State Engineer and the list of meters that conform to these specifications may be obtained from the District Offices and may be found on the State Engineer's website at  To install a meter that is not on the State Engineer's list of conforming meters requires that, prior to installation, the appropriate District Office determines that the meter meets the adopted Measurement Specifications and approves its installation. The State Engineer may modify these standards, specifications and guidelines, or adopt additional standards, specifications and guidelines for meters and for their installation, repair and maintenance, or for other alternative measurement methods or devices, which shall be on file in his office.