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Standard Test Method for Indirect Measurements of Discharge by Step-Backwater Method
STANDARD published on 1.1.2013
Designation standards: ASTM D5388-93(2013)
Note: WITHDRAWN
Publication date standards: 1.1.2013
SKU: NS-30985
The number of pages: 5
Approximate weight : 15 g (0.03 lbs)
Country: American technical standard
Category: Technical standards ASTM
Keywords:
flood, open channel flow, water discharge&emsp,, ICS Number Code 17.220.20 (Measurement of electrical and magnetic quantities)
Significance and Use | ||||||
5.1 This test method is particularly useful for determining the discharge when it cannot be measured directly (such as during high flow conditions) by some type of current meter to obtain velocities and with sounding weights to determine the cross section (refer to Test Method D3858). This test method requires only one high-water elevation, unlike the slope-area test method that requires numerous high-water marks to define the fall in the reach. It can be used to determine a stage-discharge relation without needing data from several high-water events. 5.1.1 The user is encouraged to verify the theoretical stage-discharge relation with direct current-meter measurements when possible. 5.1.2 To develop a rating curve, plot stage versus discharge for several discharges and their computed stages on a rating curve together with direct current-meter measurements. |
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1. Scope | ||||||
1.1 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.1.2 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. 1.3 The values stated in inch-pound units are to be regarded as the standard. The SI units given in parentheses are for information only. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. |
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2. Referenced Documents | ||||||
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1.8.2011
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1.5.2012
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1.5.2012
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15.4.2009
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15.4.2009
Historical
1.11.2013
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