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ASTM
D5388-21
Standard Test Method for Indirect Measurements of Discharge by Step-Backwater Method
2021
5
ASTM Vol.11.01 (2023)
This test method covers the computation of discharge of water in open channels or streams using representative cross-sectional characteristics, the water-surface elevation of the upstream-most cross section, and coefficients of channel roughness as input to gradually-varied flow computations.2 This test method produces an indirect measurement of the discharge for one flow event, usually a specific flood. The computed discharge may be used to define a point on the stage-discharge relation...