ESTIMATING DISCHARGE FROM SUPERELEVATION IN BENDS

A METHOD IS PRESENTED FOR ESTIMATING OPEN CHANNEL DISCHARGE FROM THE MAXIMUM SUPERELEVATION MEASURED IN THE BENDS. IT WAS BASED ON DATA ASSEMBLED FROM A DOZEN SOURCES, REPRESENTING ABOUT 70 SEPARATE EXPERIMENTS IN THE SUBCRITICAL FLOW REGIME, AND INCLUDED INFORMATION ON CHANNELS OF DIFFERENT CROSS- SECTIONAL SHAPES, INCLUDED ANGLES, AND CURVATURE RATIOS. THE RESULTING PREDICITIVE EQUATION INCLUDES THE EFFECTS OF CURVATURE RATIO, INCLUDED ANGLE, AND SUPERELEVATION ON DISCHARGE. THE METHOD WAS APPLIED TO A SINGLE FLOW EVENT ON BUFFALO CREEK N. Y.. IT WAS FOUND THAT ONLY CURVES IN WHICH THE FLOW REMAINED IN-BANK COULD BE USED TO PREDICT DISCHARGE AND THAT SUPERELEVATIONS OF LESS THAN 0.25 FT (7.6 CM) HAD TO BE EXCLUDED. THE PROBABLE ERROR OF THE BUFFALO CREEK ANALYSIS WAS 8% WITH RESPECT TO THE MEAN OF THE DISCHARGES PREDICTED FROM INDIVIDUAL CURVES, WHILE THE DATA UPON WHICH THE METHOD WAS BASED HAD A PROBABLE ERROR OF 12%.

• Supplemental Notes:
  • PROC. PAPER 9482
• Authors:
  • Apmann, R P
• Publication Date: 1973-1

Media Info

• Pagination: p. 65-79
• Serial:
  • Journal of the Hydraulics Division
  • Volume: 99
  • Issue Number: hy 1
  • Publisher: American Society of Civil Engineers

Subject/Index Terms

• TRT Terms: Channel flow; Channels (Waterways); Flow; Highway curves; Hydraulics; Rivers; Streamflow; Streams; Water
• Uncontrolled Terms: Open channel flow
• Old TRIS Terms: Bends; Discharge measurement
• Subject Areas: Highways; Hydraulics and Hydrology;

Filing Info

• Accession Number: 00204484
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 2 1973 12:00AM