The term “pressurized” refers to any system in which liquid flows through a pipe. Water is typically (but not always) pumped directly into a pipe in a closed and pressurized system.
Examples of pressurized pipe measuring devices
Mechanical — propeller, positive displacement, or turbine
Electronic — electromagnetic (i.e., insertion or full pipe), ultrasonic, or vortex
Metering requirements for pressurized systems
- WAC 173-173-100 — What are the specific requirements for meters for pressure systems?,
- WAC 173-173-110 — What are the installation requirements for meters on pressure systems?
- WAC 173-173-120 — What are the operation and maintenance requirements for meters on pressure systems?
Open channel systems
The term “open channel” refers to any system in which liquid flows with a free surface, such as canals or irrigation ditches.
Examples of open channel measuring devices
Weirs — sharp crested (v-notch, rectangular, or Cipoletti)
Flumes — long-throated or Parshall
Electronic methods — Doppler, electromagnetic, anemometer and propeller velocity, optical strobe
Metering requirements for open channel systems
- WAC 173-173-130 — What are the specific requirements for measuring systems on open channels?
- WAC 173-173-140 — What are the installation requirements for open channel measuring systems?
- WAC 173-173-150 — What are the operation and maintenance requirements for open channel measuring facilities?
Meter vendors and installers
WAC 173-173 lays out the requirements for installing meters. If you are responsible for reporting your water use, you must also ensure you have an approved measuring device installed or constructed in accordance with the manufacturer’s and/or designer’s specifications. This applies to both pressurized systems and open channel flows.
If you are unsure of the manufacturer’s specifications, you may consider hiring a professional vendor within your service area to install your meter. Examples of professional services that may sell or perform meter installations include (but are not limited to):
- Pipe and pump companies
- Irrigation specialists
- Instrument supply shops
- Water specialty companies
- Electric instrumentation supply
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