Open Channel Flow Measurement Specialists

As Hydrometric Consultants, we regularly install fixed and portable open channel area velocity flowmeters for short and long-term effluent and discharge flow monitoring. For permanent devices, a gauging structure is required: v-notch, rectangular weir and flumes are but a few examples. However, they must be installed correctly - if not, then the overall accuracy will be diminished. In addition, a high accuracy flow meter will not negate the effects of a poorly installed structure, and vice versa. It is therefore critical that a comprehensive survey is conducted prior to installation. For existing hydrometric installations, a survey can establish any hydraulic problems, flow meter commissioning errors, maximum and minimum discharges.

Flow monitoring in open channels, rivers and streams is a complex topic with extensive theoretical relationships. By using portable or fixed open channel flow meters it is possible to accurately monitor flowrates in open channels. However, even small installation or setup errors can cause exponentially large errors. It is therefore critical that such devices are installed correctly and that it conforms to BS3680.

RS Hydro operates nationwide and has experienced multi disciplined hydrometric consultants and engineer covering installation, commissioning, service, sales and hire. The location of RS Hydro's offices guarantees a rapid response. RS Hydro's serviced extends to the maintenance and installation of third party equipment along with site commissioning and start up supervision. Brand names include: Solatron Mowbrey, Siemens Milltronics, VEGA and Druck.

Flowmeter Installation

RS Hydro can provide hydrometric engineers to install individual equipment or provide bespoke flow monitoring packages including automated daily data retrieval via its telemetry solutions package. As hydrometric specialists , we provide a unique service within the flow metering industry providing customised solution engineering packages to the customer.

For example, a client requiring a remotely powered open channel flow meter to meet the MCERTS flow measurement standard along with an automated telemetry link but not knowing where to go for the complete package need look no further. RS Hydro will advise on the system design, alternative devices, the equipment needed including third party equipment and then install and commission as a complete package.

Servicing and Calibration

Our service and calibration department can undertake all your calibration requirements. Due to the complexity of stream flow monitoring devices, it is inherently important that they are regularly services and calibrated. Compliance monitoring, IPPC, UWWT, MCERTS and the Environment Agency contain and utilise significant legislative powers to ensure that discharges and abstractions are enforced. Our service department will ensure that these targets are met.


  • Water and sewage
  • Chemical
  • Quarries
  • Manufacturing
  • Product Supply
  • Automotive
  • Pulp and paper
  • Food and beverage

Flow Meter Rental

Many hydrometric projects cannot justify the purchase of a flowmeter. As such we are able to offer a unique hire service covering all models of area velocity flow meter and river flow meter. We have extensive stocks and can easily resource flowmeters for large projects at short notice.