1. ENTRY OF FLOW MEASUREMENT DATA
FLOW & ASSOCIATED LEVEL MEASUREMENT
STAGE-DISCHARGE RELATIOSHIP
DISCHARGE BY VELOCITY-AREA METHOD
FLOATS
SLOPE-AREA METHOD
PRIMARY MODULE (SWDES) PROVIDES DATA ENTRY FORMS DEDICATED TO SUCH REQUIREMENT
DETAILED FLOW MEASUREMENTS
SUMMARY STAGE-DISCHARGE
HISTORICAL OBSERVATIONS
CROSS-SECTION PROFILE DATA
OHS - 1

2. OHS - 2

3. OHS - 3

4. OHS - 4

5. OHS - 5

6. VELOCITY DISTRIBUTION IN RIVER CROSS SECTION
1.2 m/s
1.0 m/s
0.8 m/s
0.6 m/s
OHS - 6

7. FLOW MEASUREMENT - AREA VELOCITY METHODb2 b3 b4 b5 b6 b7 b8
b18
b19
D4, V4 b1
b17
OHS - 7

8. FLOW MEASUREMENT - AREA VELOCITY METHOD
b19
b18 b8
b17 b7 b6
SECTIONS b5 b4 b3 b2 b1
SEGMENT
FLOW MEASUREMENT - AREA VELOCITY METHOD

9. FLOW MEASUREMENT - AREA VELOCITY METHOD
COMPARTMENT 1
COMPARTMENT 2
FLOW MEASUREMENT - AREA VELOCITY METHOD

10. OHS - 8

11. OHS - 9

12. DATA ENTRY FORMS DEDICATED DATA ENTRY FORMS
GENERAL & GAUGE INFORMATION
CURRENT METERING OBSERVATIONS
FLOAT OBSERVATIONS
SLOPE OBSERVATIONS
SUMMARY STAGE-DISCHARGE DATA
OHS - 10

13. OHS - 11

14. OHS - 12

15. OHS - 13

16. OHS - 14

17. Water depth

19. Airline Correction
Wetline Correction

20. Reading = 3. 5 m
Airline depth

21. Reset counter
Reading = 0. 0 m

22. Reading = 4. 2 m
Water depth

23. Observed depth =4.35 m
= m
Total correction = 0.15m
Reading = 3.5 m
Reset the counter
Reading = 0.0 m

24. OHS - 14

25. OHS - 15

26. OBLIQUE FLOW
OHS - 21

27. OHS - 22

28. OHS - 23

29. MEAN VELOCITY PROFILE
OHS - 24

30. SEGMENTAL FLOWS
OHS - 25

31. OHS - 26

32. FLOAT OBSERVATIONS
OHS - 27

33. FLOW ESTIMATE BY SLOPE-AREA METHOD
HIGH STAGES WHEN VELOCITIES ARE DIFFICULT TO MEASURE
ESTIMATE CAN BE BASED ON SLOPE-AREA METHOD
SLOPE OF WATER SURFACE PROFILE IS OBSERVED
MANNING’S EQUATION USED TO GET DISCHARGES
OHS - 28

34. OHS - 29

35. OHS - 30

36. OHS - 31

37. OHS - 32