Mace HVFlo XCi, Product Manual

Page: 197 / 255

"Velocity (depth corrected)" - channel type
This channel is used to apply a correction factor to measured velocity data based upon different depth
regimes of the stream.
Unfortunately, ideal hydraulic conditions cannot be achieved at every site that requires monitoring. If you are
in a situation where hydraulic conditions are such that velocity calibrations at various flow regimes are
required, then the " Velocity (depth corrected) " channel may help. Under abnormal hydraulic conditions,
the average velocity of the stream must be calculated using traditional means that comply with international
standards (refer to AS3778 series or ISO772). The calibration will need to be done at various depths and the
calculated velocity/MACE Doppler velocity ratio determined. You can then apply the ratio to the data. For
example, if you measure the average velocity of a stream to be 0.95m/s and the MACE Doppler velocity
sensor is measuring 1.0m/s then the velocity ratio will be 0.95/1.0. (or 0.95). In the example below, a stream
is measured at four depth regimes and four ratios have been determined. Situations such as a gravity type
sewer with a bend upstream may result in the need to use this function. If the hydraulic conditions are
reasonable at the site you choose to monitor then there is no need to use this function.
Add a "Velocity (depth corrected)" - channel type
1. After selecting the "" Velocity (depth corrected)
" channel type and naming the new channel, the
"
Select velocity channel
" dialogue box will appear prompting you to use the drop down list to
highlight the "
Velocity channel
" from which the new "
Velocity (depth corrected)
channel" will
receive its value.
2. Click “ Continue
” and the “
Select depth channel
” dialogue box will appear. In the “
Select depth
channel
” dialogue box use the drop down list to highlight the "
Depth
" channel from which the
"
Velocity (depth corrected)
" channel named will receive its value. Click “
Continue
” to complete the
new channel.
Edit a "Velocity (depth corrected)" - channel type
MACE XCi User Manual - 197 -