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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
River Width, B (m)
Less than 10m
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
�� = ∑ �� ( ��
) × 0.5 �
− ��
Equation 5:3 - Japanese Method > 10m
1
0
�� ( ��
��
The equation of the Japanese method for measurement section smaller than 10m is
given in
Equation 5:4.
�� = ∑ �� ( ��
− ��
) × 0.5 �
Equation 5:4 - Japanese Method < 10m
1
0
���
��
−��
2
2
���
FlowTracker2 User's Manual (January 2019)
Table 5-1 - Predetermination of Measuring Intervals
Measuring Interval of
10-20
20-40
40-60
60-80
80-100
100-150
150-200
200 over
� + ( ��
+
��
+��
��
+��
'
'
1
0
1
0
2
2
) × 0.5 �
− ��
+
Edge
��
+��
'
��
��
��−1
2
+
� + �
��
+��
��
+��
��
'
'
1
1
0
0
2
2
� × 0.5 �
+
Edge
��
+��
��
+��
'
1
2
2
1
2
2
� × 0.5 �
��
−��
��
+��
��
��−1
��
2
2
Table
5:1.
Depth, M (m)
10 – 15% of B
1
2
3
4
5
6
10
15
Equation 5:3.
) × 0.5 �
− ��
+
��
+��
'
2
2
2
1
2
� + ( ��
− ��
��
+��
'
��−1
��−1
��+1
2
Open Water
� × 0.5 �
+
−��
��
+��
��
'
2
1
2
2
1
2
2
� + �
� × 0.5 �
��
−��
��
'
1
3
2
3
2
+
� + �
Open Water
��
+��
��
'
'
��
��−1
��−1
��+1
2
2
Open Water
74
SonTek – a Xylem brand
Measuring Interval of
Velocity, N (m)
N=M
2
4
6
8
10
12
20
30
�� × �
�� +
��
+��
��
+��
'
'
1
1
1
1
2
2
) × 0.5 �
+
��
+��
'
��+1
��+1
��
2
�� × �
�� +
+��
��
+��
'
'
1
1
1
2
2
+
�� × �
+��
��
+��
��
+��
'
'
'
3
2
2
2
2
2
2
2
� × 0.5 �
+
−��
��
+��
'
��
��+1
��+1
2
�� × �
��
��
+��
��
+��
'
'
��
��
��
��
2
2
�� +
�� × �
��
��
+��
��
+��
'
'
��
��
��
��
2
2
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