Manual – Starflow QSD Model 6527B and 6537A
Unidata Manual - 6527B and 6537A Starflow QSD User Manual 08 05 2023.docx
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10.5.3. Open Channel and Natural Stream
The dimensional definition of any open channel (or stream) consists of pairs of “distance”
and “reduced level” measurement which define the profile of the channel or stream. These
pairs comprise the Channel Cross-Sectional Area.
For constructed channels, this information is easily determined from known construction
dimensions. For natural streams, you will need to make actual measurements of the stream
bed. In addition, you require two parameters, the depth range and offset.
Range
(m) Depth range of the channel. This defines the maximum depth of the channel.
There are two ranges: 2m and 5m.
Define the smallest maximum depth for the channel that is compatible with your Starflow
QSD as this will give the best results. For example - for a 2m depth range Starflow QSD in a
900mm maximum depth channel, choose 1 to improve accuracy.
Offset
(m) This defines the offset (reduced level) of the Starflow QSD instrument from the
reference to the depth sensor.
10.5.3.1. Determining Distance/Reduced Level Information
Select an arbitrary reference point above the highest water level expected. This is a (0,0)
pair. Measure across the channel and down to the channel bed at a sufficient number of
points to define the bed profile. Adjacent points are connected by straight lines. There may
be as many Distance/RL pairs as you need.
The reference point (0,0) may be any datum standard that must be above the highest water
level.
