Manual – Starflow QSD Model 6527B and 6537A
Unidata Manual - 6527B and 6537A Starflow QSD User Manual 08 05 2023.docx
Page 60
10.4.
Flow Measurement Extension
Starflow QSD is able to perform a wide range of flow calculations. This enables Starflow
QSD 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 QSD from the Area Rating
Table using the measured depth.
Units = cm2 or dm2 or m2.
Area Rating
Table:
A look-up table of depth versus cross-sectional area of the channel
being measured.
Depth (D):
Water depth above the Starflow QSD unit.
Units = mm.
Velocity (V):
The average (median) velocity of water in the channel measured by
Starflow QSD.
Units = mm/s.
Scan Rate (SR):
Frequency of Starflow QSD measurement cycle (Default = 60
secs).
Units = second.
Log Interval:
Frequency of Starflow QSD recordings. (Default = 15 minutes).
Units = scans
Flow Rate (FR):
Instantaneous Flow Rate, calculated by Starflow QSD as the
product of Velocity and Area.
Units = l/s or kl/s or Ml/s.
FR V A
Flow (F):
Flow volume of each scan interval is calculated by Starflow QSD 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
When the Flow Extension is added, select the Depth and Velocity channels, noting that
depending on the site, either the Ultrasonic or Pressure Depth can be chosen.
