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Flow and Discharge

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Critical Uses of Flow and Discharge Measurements

Measuring stream flow and calculating discharge to determine the amount of water flowing through streams, rivers, canals, and channels is critical for predicting water availability and flood events, allocating water, and more.

OTT HydroMet has been a leader in flow meter technology for over 100 years, from the first mechanical velocity meters to advanced acoustic Doppler technology used today.

We offer a variety of technologies for continuous water flow measurement and computational discharge, from portable in-stream current meters to side looking acoustic Doppler technology or non-contact surface velocity radar sensors.

Our Products

OTT SVR 100 Surface Velocity Radar

OTT SVR 100 is a simple, non-contact, compact surface water velocity radar sensor. Designed for measuring flow in open channels and rivers where reliable velocity data is required continuously, during floods or periods of high concentrations of suspended sediments.

  • Product Highlights: Identify data influenced by sensor movement (e.g., wind, traffic) using meta data from integrated vibration and tilt sensors
  • Application fields: Non-contact surface velocity radar
  • Internal data logger: No
  • Measurement range: 0.08 ... 15 m/s (0.26 … 49 ft./s)

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OTT SLD - Side Looking Doppler Sensor

The OTT SLD uses acoustic Doppler technology for continuous measurement of water velocity and level in streams, rivers, and canals.

  • Parameters measured: Flow velocity
  • Product Highlights: Side-Looking-Doppler for continuous discharge measurement in rivers and open channels. Discharge calculation based on velocity - index - method. Integrated vessel filter algorithm, Modbus interface and output of total volume of flow (max. interval 1 day).
  • Measurement range: Velocity: -10 - +10 m/s, Water Level: 0.15 - 10 m

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OTT MF Pro Portable Flow Meter

The OTT MF Pro is a user-friendly, low maintenance electromagnetic current meter for cost-efficient in-stream discharge measurement.

  • Parameters measured: Flow velocity and water depth
  • Product Highlights: Low maintenance magnetic - inductive probe with level measurement for reliable flow measurements. Works well in low flow and turbulent conditions, cross - sections with weed growth and pollution. Applicable in streams and conduits.
  • Measurement range: Velocity: 0 - 6 m/s, Depth: 0 - 3.05 m

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OTT MF pro Meter, Portable with Case

The OTT MF pro is a magnetic-inductive flow meter designed for SxS wading rod measurements in smaller rivers and open channels. The low-maintenace system consists of a compact light-weight sensor and a robust handheld unit that reliable operates even under rough environments. Both system components are designed to be attached to conventional wading rods.

  • Battery Life: 18 hours heavy typical day use
  • Battery Type: Lithium-Ion, Rechargable
  • Display: Color, LCD; 3.5 in QVGA, transflective
  • IP Rating: IP67
  • Operating Temperature Range: -4 - 131 °F (-20 - 55 °C)

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OTT C31

OTT C31 Universal current meter for flow velocity measurement in rivers and open waterways. Rod-mounted or as cable-suspended current meter from a bridge, boat or on cable ways.

  • Parameters measured: Flow velocity
  • Product Highlights: C31 - the original. Traditional hydrometric current meter with proved quality for use with wading rods, from bridges and at cable-way installations
  • Measurement range: 0.025 ... 10 m/s
  • Accuracy: ± 2%

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OTT C2

The OTT C2 small current meter for discharge measurements for shallow waters in small rivers, channels, laboratories and river models.

  • Parameters measured Flow velocity
  • Product Highlights: OTT C2 - the original for wading rod measurements in shallow streams, applicable from 4 cm water depth.
  • Measurement range: 0.025 ... 5 m/s
  • Accuracy: ± 2%

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