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9.2.6 Environmental Factors: Wind, Rain, & Snow
Wind moving across a water surface can produce waves, which result
in movement differing from the main direction of the water flow . In
high-velocity water flow, this effect is minimal or non-existent and
does not affect the measurement .
However, in low water surface flow, such as conditions below 1
to 2 f/s (0 .30 to 0 .60 m/s), the wind’s effect is dominant, so the
measurement might not reflect the actual velocity movement . In
wind, position the SVR™ toward a target area where wind does not
affect or minimally disturbs the water surface, such as under a bridge
or in a sheltered area .
Rain and snow can influence the accuracy of measurements . In slow
water flow conditions, the vertical velocity component of rain or
snow is dominant . Rain droplets passing in front of the measuring
plane of the antenna and water surface roughness produced by rain
droplets contacting the water surface cause this effect . However,
in conditions of rapid water flow, these effects are minimal . The
dominant effect is the surface water flow following the direction of
the main open channel .
In these conditions, take measurements under a bridge, structure,
or covered area where rain and snow do not dominate the
measurement . Take measurements where the main channel flow is
dominant . This eliminates the potential for errors from environmental
factors .
10. Care, Cleaning, and Storage
• Avoid spilling food, beverages, and other liquids and substances
on the radar device
• When you are not using or transporting the device, store it in its
original packaging
• To clean the radar device, use a soft clean cloth, which is free of
cleaning solutions
