HyQuest Solutions’ LVQ-15 and LVQ-35 are sensors for continuous discharge measurement of rivers, open channels and canals with known cross-section profile. The sensors use innovative radar technology to measure velocity, water level and discharge. They enable reliable, non-contact measurement without the need for structural work in the water. Thanks to the non-contact radar technology the LVQ is not susceptible to contamination, debris or driftwood in the water. Furthermore, the non-contact measurement ensures very low maintenance and fail-safe operation especially during high water or flooding. The LVQ can be simply mounted on bridges, on the roofs of closed canals or channel superstructures. Depending on the properties of the water surface the device can be installed in a height of 0.5 to 35 m. The measurable velocity range is between 0.10 and 15 m/s. Additionally the direction of flow is detected, enabling the operation in tide influenced rivers. The non-contact radar technology determines the water surface flow velocity using the Doppler frequency shift method and furthermore the water level is established by a travel time measurement. With known cross section profile the discharge Q of the water is calculated.