The Hydro-Logic™ Flow Logger is a precision flow meter that delivers spot or continuous flow monitoring of rivers, streams, sewers and other bodies of moving water.

Working as the front end of a Smart Monitoring system, the Hydro-Logic™ Flow Logger provides precision water flow data to support multiple applications. As either a single unit or a part of a larger network, the Hydro-Logic™ Flow Logger transmits data automatically to cloud-based servers or to an existing SCADA system for continuous monitoring of remote natural or built watercourses, providing hydrologists, engineers and emergency response personnel with data and alarms to help them plan, act and react quickly and effectively to emerging environmental events as well as long-term climate trends.

Whether for discrete, spot monitoring or continuous monitoring across a whole network, system or environmental area, the Hydro-Logic™ Flow Logger delivers reliable insight into flow rates, providing engineers with the real-world data that they need to analyse, model and forecast flow in support of effective resource management, feasibility studies, network design and optimization.

Recording data at intervals as low as 10 seconds, when combined with a telemetry system the Hydro-Logic™ Flow Logger provides real-time environmental monitoring, and battery lifetimes of up to seven years mean that it can be left to operate remotely without support, feeding a database to power long-term planning, purchasing and asset management decisions.

Typical sensors:

The Hydro-Logic™ Flow Logger is compatible with a range of open-channel flow meters for almost any type of channel and hydraulic conditions.

  • Ultrasonic, using cross-correlation method
  • Continuous wave doppler
  • Single elevation horizontal pulsed doppler
  • Electromagnetic pipe-flow


  • Real-time flow monitoring – streams, rivers, sewers
  • Low-impact developed (LID) site monitoring
  • Water resources management
  • Water asset management
  • Hydropower feasibility analysis

The precise configuration of the Hydro-Logic™ Flow Logger will vary depending on your site and on what data you want to collect. Please contact us to talk to an expert about your specific water flow data logging requirements.

Designed for

High flow
Low flow
Medium flow


Design, optimize and upgrade sewer networks

The Hydro-Logic™ Flow Logger provides huge amounts of reliable real-world flow data to use in drainage models, giving engineers insight into realistic operating conditions to enable them to design effective new systems and expand, upgrade and optimize existing systems.

Make better water resources management decisions

In order to balance supply and demand across complex networks both now and in the future, water utilities need to understand intimately the current situation and to extrapolate future situations with a high degree of accuracy. The Hydro-Logic™ Flow Logger provides the kind of meaningful, actionable big data on water movement that utilities need in order to forecast, plan and purchase with confidence.

We are able to provide water resources management guidance and expertise. Read more about our Water Demand, Resources & Supply consultancy services or contact us to discuss your specific requirements.

Cut your flow monitoring operation costs

Water flow data loggers often need to be installed in remote or difficult-to-access locations—such as rivers, streams and sewers—and regular battery replacement increases the cost of maintenance and operation. With industry-leading battery lifetimes of up to seven years, the Hydro-Logic™ Flow Logger keeps operating for longer—cutting support requirements and enabling you to direct your support teams onto other activities.

How it works

How it works

  1. Following a site and installation assessment the Hydro-Logic™ Flow Logger—or network of loggers—is installed on site. Typical installations include inside drains and culverts, mounted on a pole, or at the side of a lake, river or reservoir.

  2. The logger is calibrated and set to log data according to application-specific requirements. The Hydro-Logic™ Flow Logger can conduct regular data logging at intervals from as low as 10 seconds and as high as 12 hours.

  3. The data logger collects water level data autonomously and either transmits it automatically to a telemetry system, or houses it until support personnel return to manually download the data.

  4. The logger may be integrated into an existing SCADA system via M2M protocols such as DNP3 or Modbus.

Contact us to talk to an expert about your specific requirements.


Technical information

Technical information

Data logging interval 

  • Minimum: 10 seconds 
  • Maximum: 12 hours

Data capacity (16-bit readings) 

  • 29,760

Channels 

  • Analogue: up to 8 
  • Digital: up to 3 
  • SDI-12: up to 16

Data delivery method 

  • Automatic transmission (via telemetry system) 
  • Manual download

Modem type 

  • 2G, 3G as standard 
  • LORA Radio and PSTN options 
  • Internal and external modem options

Other technical features 

  • DNP3 Open Protocol 
  • Unit waterproofing - IP65 and IP68 standard 
  • ATEX option 
  • LCD display option 
  • External battery pack option

Typical installation situations 

  • Inside drain or culvert 
  • Bridge or pole mounted
  • Riverside, lakeside or reservoir


Technical features vary by application. Our experts will advise you on which model and sensor best meet your needs.



Case Studies

Case Studies