SonTek – a Xylem brand
FlowTracker2 User’s Manual (January 2019)
74
the Japanese method is the duplicate measurements performed of each depth and point
velocity measurements at a station. The Japanese national standard guideline for
determining the measurement interval for depth and velocity are dependent on the
measurement section width and are supplied in Table 5:1.
Table 5-1 - Predetermination of Measuring Intervals
River Width, B (m)
Measuring Interval of
Depth, M (m)
Measuring Interval of
Velocity, N (m)
The Japanese method has two separate equations for determining the total discharge
based on the measurement section width. The equation of the Japanese method for
measurement section greater than 10m is given in Equation 5:3.
Equation 5:3 - Japanese Method > 10m
=
(
)
× 0.5
+
+
(
)
× 0.5
+
×
+
Edge
(
)
× 0.5
+
+
(
)
× 0.5
+
×
Open Water
The equation of the Japanese method for measurement section smaller than 10m is
given in Equation 5:4.
Equation 5:4 - Japanese Method < 10m
=
(
)
× 0.5
+
+
× 0.5
+
×
+
Edge
× 0.5
+
+
× 0.5
+
×
+
Open Water
× 0.5
+
+
× 0.5
+
×
Open Water
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