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Comprehensive Guide to Channel Section Shifts and V-Diagrams

Understand how V-diagrams and shift curves help in analyzing channel control and section control measurements. Learn how to apply shifts accurately based on stages and time. See a practical example for effective shift application.

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Comprehensive Guide to Channel Section Shifts and V-Diagrams

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  1. Channel Cross Section Shifts are applied by developing “V-diagrams” Recent Measurements Measurements plotted on axes of V-diagram

  2. Channel Cross Section Here is what a v-diagram and its shift curve generally look like Shift curve Variable shift diagram

  3. Shifts vary by STAGE and TIME Sept. 1 July 1

  4. Shifts should be faithful to the base rating Meas. made 7/20 and 8/15 Sept. 1 July 1

  5. Let’s follow an application of shifts at a site Recent Measurements Concrete Control

  6. It would be easy (but WRONG) to lump all measurements into one shift---- 4 5 6 3 2 1 4 6 3 5 2 1

  7. One shift doesn’t always work Channel Control Section Control

  8. You need to consider the hydrograph when applying shifts

  9. Let’s see how all the available information should be put together Algae growth? Channel Control Section Control

  10. Changes in the channelcontrol caused the rating to shift Upstream view of control at GH of 5.40 feet Channel Control Downstream view of control at GH of 6.25 feet

  11. Measurements were used to define two shift curves V-diagram representing channel control 4 V-diagram representing section control 5 6 3 2 1

  12. Shift application took the hydrograph into account Effective from ???? Effective from ???

  13. Hold Scour Fill Here is a generalized example of how shifts can be timed Prorate X #3 #2 X #1 X X=Discharge Measurement

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