Manual – Starflow Ultrasonic Doppler Instrument
Model 6526
Unidata Manual - 6526 Starflow User Manual Issue 17 01 2020.docx
Page 59
13.0
FLOW MEASUREMENT EXTENSIONS
Starflow is able to perform a wide range of flow calculations. This enables Starflow to be used in
partly filled circular pipes, regular open channels and natural streams.
Other closed shapes such as ovoid pipes, require a user-defined Area Rating Table.
Terms
Area (A):
(cross section) Calculated by Starflow from the Area Rating Table using
the measured depth.
Units = cm2 or dm2 or m2.
Area Rating Table:
Look-up table of depth versus cross-sectional area of the channel being
measured.
Depth (D):
Water depth above the Starflow unit.
Units = mm.
Velocity (V):
Average (median) velocity of water in the channel measured by Starflow.
Units = mm/s.
Scan Rate (SR):
Frequency of Starflow measurement cycle (Default = 60 secs).
Units = second.
Log Interval:
Frequency of Starflow recordings. (Default = 15 minute).
Units = scans
Flow Rate (FR):
Instantaneous Flow Rate, calculated by Starflow as the product of Velocity
and Area.
Units = l/s or kl/s or Ml/s.
FR V A
Flow (F):
Flow volume each scan interval calculated by Starflow as the product of
the Flow Rate and the measurement interval (Scan Rate).
Units = l or kl or Ml
F FR SR
Total Flow (TF):
Totalised Flow Volume.
Units = l or kl or Ml
TF F
13.1
Overview of Creating a Flow Scheme
Creating a Starflow Scheme for flow measurement is a five-step process:
1.
Determine the dimensions of the channel.
2.
For open channels create a Cross-Sectional Area in the Flow extension instrument which
has already been added in the scheme editor and enter the parameters of your channel. Points
can be added and deleted, also note that the Starflow range should be selected, this will be written
on the front of the Starflow.
If your water depth will always be below 1m it is advisable to choose the 1m range.
