Measurement Accuracy Standards and Devices

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                  Overview of Discussion

                  What  are the pros and cons of the
                   options?
                  Are there other options?
                  Overview of Options
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                  1.   +/- 6% msmt. accuracy by volume or flow rate
                       (consistent with CVP contractors’
                       requirement) at individual customer
                  2.   +/- 15% msmt. accuracy by volume or flow
                       rate at individual customer
                  3.   Combination of measurement at laterals,
                       and/or at individual customers
                  4.   Measurement at basin level or supplier level,
                       with estimation for individual customers
                  5.   Others?
                   Option 1: +/- 6% msmt. accuracy by
                   volume or flow rate
A2 SUBCOMMITTEE


                   Canthis meet requirements of section
                   10608.48(b)
                   • Annual report of aggregated farm-gate delivery
                   • Implement pricing structure at least in part volumetric
                   What    are pros/cons of this option, such as:
                   •   Kinds of devices that can provide this accuracy
                   •   Appropriate maintenance, checks, calibration
                   •   Typical range of installation cost
                   •   Other considerations
                   Option 2: +/- 15% msmt. accuracy by
                   volume or flow rate
A2 SUBCOMMITTEE


                   Canthis meet requirements of section
                   10608.48(b)
                   • Annual report of aggregated farm-gate delivery
                   • Implement pricing structure at least in part volumetric
                   What    are pros/cons of this option, such as:
                   •   Kinds of devices that can provide this accuracy
                   •   Appropriate maintenance, checks, calibration
                   •   Typical range of installation cost
                   •   Other considerations
                   Option 3: Lateral-level Measurement
A2 SUBCOMMITTEE


                   Canthis meet requirements of section
                   10608.48(b)
                   • Annual report of aggregated farm-gate delivery
                   • Implement pricing structure at least in part volumetric
                   What    are pros/cons of this option, such as:
                   •   Kinds of devices that can provide this accuracy
                   •   Appropriate maintenance, checks, calibration
                   •   Typical range of installation cost
                   •   Other considerations
                   Option 4: Supplier-level Measurement
A2 SUBCOMMITTEE


                   Canthis meet requirements of section
                   10608.48(b)
                   • Annual report of aggregated farm-gate delivery
                   • Implement pricing structure at least in part volumetric
                   What    are pros/cons of this option, such as:
                   •   Kinds of devices that can provide this accuracy
                   •   Appropriate maintenance, checks, calibration
                   •   Typical range of installation cost
                   •   Other considerations
                   Option X: Other Option?
A2 SUBCOMMITTEE


                   Canthis meet requirements of section
                   10608.48(b)
                   • Annual report of aggregated farm-gate delivery
                   • Implement pricing structure at least in part volumetric
                   What    are pros/cons of this option, such as:
                   •   Kinds of devices that can provide this accuracy
                   •   Appropriate maintenance, checks, calibration
                   •   Typical range of installation cost
                   •   Other considerations
                  Revisiting Questions to
                  Consider
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                  What   are the details to define a standard?
                    Is defining an accuracy standard as a +/-
                     percentage appropriate?
                    Should the definition include additional details
                     (e.g. operating flow range, field conditions,
                     etc.)?
                    Should open-channel and piped delivery
                     systems have different accuracy standards?
                    How should the “irrigation season” be defined
                     for an agricultural water supplier?
                  Compliance, Applicability, and
                  Exceptions
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                         How does a supplier comply?
                      •     Initial compliance of installed devices
                      •     On-going compliance – sampling program or all devices
                            during defined period of years
                           o     Compliance = every device compliant?
                           o     Compliance = xx% of devices compliant?
                           o     Demonstrate plan to fix non-compliant devices?
                      •     Reporting of devices’ accuracy
                      •     Must every delivery point be measured regardless of size?
                   What is a reasonable program for
                    maintenance, checks, and calibration of
                    measurement devices?
                   Other exceptions (e.g., parcel size)?

				
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posted:9/1/2012
language:English
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