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11.6.2
Communication
Field communication is essential for operational purposes and it improves the Health and
Safety process. It is suggested that the following criteria be followed where feasible,
a) Contact office before and after measurement is completed. Normally this is only
required during flood events to inform the office that the measurements were
completed and all personnel is safely off the water,
b) Contact office at scheduled times when staying overnight, e.g., 8am and or 4pm
every day. This allows the field personnel to give feedback on fieldwork and or
measurements, discussing additional work that need to be performed and verify
health and safety aspects,
c) Property owners such as farmers, local authority, etc. require persons to acquire
approval in advance before accessing their property. In certain cases it is also
required to contact the property owner when departing and this need to be verified
with the owner.
11.6.3
Measurement Site Conditions
Measurement site conditions encapsulate a number of hydraulic and physical factors that
determines if it is feasible to perform a discharge measurement. The application of the
FlowTracker2 instrument using the "wading" method is directly related to these
conditions. The following are some aspects that need to be taken into account before a
measurement is undertaken,
a) Total water depth,
b) Maximum water velocity,
c) Surface waves present,
d) Moving bed present(sediment or rocks)
e) Debris on water surface
f) Wild life (Alligators, Crocodiles, etc.)
If measurement site conditions are such that it is
unsafe to perform a wading measurement with a
FlowTracker2 instrument it is suggested that a
different approach is taken in determining the
discharge.
SonTek manufactures RiverSurveyor S5 and M9
instruments that are based on the Acoustic Doppler
Current Profiler principle. These instruments can be
used from multiple platforms such hydroboards,
manned boats or remote control boats in the following
discharge measurement methods,
i). Moving Boat Measurement,
FlowTracker2 User's Manual (January 2019)
Figure 11:9 – RiverSurveyor M9
– Moving Boat Method
194
SonTek – a Xylem brand
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