SonTek, a Xylem brand
RiverSurveyor S5/M9 System Manual (February 2013)
123
Click the Install RiverSurveyor Stationary Live option. The installation wizard (Figure 107) will
display step-by-step instructions to install the software.
Figure 107. Desktop Installation
Follow the on screen instructions to complete installation of the software. You are now ready to
use RiverSurveyor Stationary Live to make a measurement.
G-4. Making a Measurement
The primary purpose of the Stationary-Measurement system is to measure the total discharge of
a river cross-section. Because velocity measurements are made from a stationary position, the
system does not require bottom-tracking or DGPS referenced velocity measurements. This be-
comes advantageous when one or both reference techniques are unavailable due to site condi-
tions.
Stationary discharge measurements also provide additional opportunities for measurement ap-
plications such as:
• Accurate discharge measurements under ice
• Velocity profile measurements in conditions where there are significant temporal changes in
flow conditions (e.g. pulsing rivers, moving beds and channels with conditions of variable
moving beds). This also includes areas of significant turbulence (such as behind bridge pil-
ings) where instantaneous or moving vessel measurements will have significant inaccura-
cies.
G-4.1 Mid-Section Measurement Procedure
The procedure for making a discharge measurement follows the well-established methodology
as outlined by the U.S. Geological Survey (USGS) for Discharge Measurement by Conventional
Current Meters (ISO standards 768 (1997) and 9196 (1992)). This method is also referred to as
the “Mid-Section method” of computing discharge and is the same method adopted by the Son-
Tek FlowTracker. .
The mid-section method involves making a series of velocity and depth measurements at a
specific number of locations (more commonly known as stations, panels or verticals) across a
river cross-section. At each station, the depth and mean velocity profile are measured. The
depth is computed using either the 4-velocity beams, the low-frequency vertical beam, or manu-
ally measured (using a rod or other device) and entered into the software. The mean velocity
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