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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

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entry of flow measurement data
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

slide6

1.2 m/s

1.0 m/s

0.8 m/s

0.6 m/s

VELOCITY DISTRIBUTION IN RIVER CROSS SECTION

OHS - 6

slide7

b19

b18

b17

b8

b7

b6

b5

b4

b3

b2

b1

D4, V4

FLOW MEASUREMENT - AREA VELOCITY METHOD

OHS - 7

slide8

b19

b18

b17

b8

b7

b6

SECTIONS

b5

b4

b3

b2

b1

SEGMENT

FLOW MEASUREMENT - AREA VELOCITY METHOD

slide9

COMPARTMENT 1

COMPARTMENT 2

FLOW MEASUREMENT - AREA VELOCITY METHOD

data entry forms
DATA ENTRY FORMS
  • DEDICATED DATA ENTRY FORMS
    • GENERAL & GAUGE INFORMATION
    • CURRENT METERING OBSERVATIONS
    • FLOAT OBSERVATIONS
    • SLOPE OBSERVATIONS
    • SUMMARY STAGE-DISCHARGE DATA

OHS - 10

slide19

Airline Correction

Wetline Correction

slide20

Reading = 3. 5 m

Airline depth

slide21

Reset counter

Reading = 0. 0 m

slide22

Reading = 4. 2 m

Water depth

slide23

Observed depth =4.35 m

=4.2+0.15 m

Total correction = 0.15m

Reading = 3.5 m

Reset the counter

Reading = 0.0 m

oblique flow
OBLIQUE FLOW

OHS - 21

flow estimate by slope area method
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

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