SonTek – a Xylem brand
FlowTracker2 User’s Manual (January 2019) 301
Appendix C. Japanese Method Example
The measurement example of the Japanese method given in Appendix C is based on an actual field measurement that was
manually calculated to give an overview of the various steps involved. The section of the measurement site was greater than
10m and based on the Japanese Method, the measuring technique applicable is Equation 5:3.
Equation 5:1 - Japanese Method > 10m
=
(
)
× 0.5
+
+
(
)
× 0.5
+
×
+
Edge
(
)
× 0.5
+
+
(
)
× 0.5
+
×
Open Water
Items to be field in the field survey
Items to be filled after survey
Stn
no
from
Bank
Disc.
(m
3
/s)
When
going
When
back
Average
Meas
depth
Sound
no.
Vel.
(m/s)
Ave.
(m/s)
Ave.
Depth
Ave
Width
Area
(m
2
)
Sum
(m
2
)
1
st
2
nd
Ave
0.58 2.00 1.16
1 2 1.15 1.16 1.16
1.16 3.32 3.85
1.08 2.00 2.16
2 4 1.00 1.00 1.00
0.90 2.00 1.80
3 6 0.80 0.80 0.80
1.20 3.26 3.91
0.73 2.00 1.46
4 8 0.66 0.65 0.66
0.60 2.00 1.20
5 10 0.54 0.54 0.54
0.88 2.20 1.94
0.50 2.00 0.92
6 12 0.45 0.45 0.45
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