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ASTM D4409-95(1999)

(Test Method)

Standard Test Method for Velocity Measurements of Water in Open Channels with Rotating Element Current Meters

Standard Test Method for Velocity Measurements of Water in Open Channels with Rotating Element Current Meters

SCOPE
1.1 This test method describes the design and use of cup-type or vane-type vertical axis current meters and propeller-type horizontal axis current meters for measuring water velocities in open channels.  
1.2 This test method is intended primarily for those meters customarily used in open-channel hydraulic (as distinguished from oceanographic) applications with an operator in attendance.  
1.3 This test method is intended primarily for current meters that measure one component or filament of flow.  
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.

General Information

Status
Historical
Publication Date
09-Jun-1999
ICS
17.120.10 - Flow in closed conduits
Technical Committee
D19 - Water
Drafting Committee
D19.07 - Sediments, Geomorphology, and Open-Channel Flow
Current Stage
Ref Project

Relations

Replaced By
ASTM D4409-95(2003) - Standard Test Method for Velocity Measurements of Water in Open Channels with Rotating Element Current Meters
Effective Date
10-Jun-2003

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ASTM D4409-95(1999) - Standard Test Method for Velocity Measurements of Water in Open Channels with Rotating Element Current MetersASTM D4409-95(1999) - Standard Test Method for Velocity Measurements of Water in Open Channels with Rotating Element Current Meters
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ASTM D4409-95(1999) - Standard Test Method for Velocity Measurements of Water in Open Channels with Rotating Element Current Meters
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D 4409–95 (Reapproved 1999)
Standard Test Method for
Velocity Measurements of Water in Open Channels with
1
Rotating Element Current Meters
This standard is issued under the fixed designation D 4409; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (ε) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Terminology
1.1 This test method describes the design and use of 3.1 Definitions: For definitions of other terms used in this
cup-type or vane-type vertical axis current meters and test method, refer to Terminology D 1129.
propeller-type horizontal axis current meters for measuring 3.2 Definitions of Terms Specific to This Standard:
water velocities in open channels. 3.2.1 current meter—an instrument used to measure the
1.2 This test method is intended primarily for those meters speed or velocity of flowing water at a point.
customarily used in open-channel hydraulic (as distinguished 3.2.2 Price-type current meters—generic name for specific
from oceanographic) applications with an operator in atten- vertical axis meters with a rotating element consisting of six
4
dance. conical cups and constructed as described in Refs (1-3).
1.3 Thistestmethodisintendedprimarilyforcurrentmeters 3.2.3 spin test— a test performed to check the bearings of a
that measure one component or filament of flow. current meter. This test is used primarily with vertical axis
1.4 This standard does not purport to address all of the current meters.
safety concerns, if any, associated with its use. It is the 3.2.4 turbulence—irregular condition of flow in which the
responsibility of the user of this standard to establish appro- velocity exhibits a random variation with time and space
priate safety and health practices and determine the applica- coordinates so that statistically distinct average values can be
bility of regulatory limitations prior to use. discerned.
2. Referenced Documents 4. Summary of Test Method
2.1 ASTM Standards: 4.1 The angular velocity of the rotating element is a
2
D 1129 Terminology Relating to Water function of water speed at the point of immersion.This angular
D 2777 Practice for Determination of Precision and Bias of velocity is determined from the meter output and its functional
2
Applicable Methods of Committee D-19 on Water relation to the water speed is determined by calibration.
D 3858 Test Method for Open-Channel Flow Measurement
5. Significance and Use
2
of Water by Velocity-Area Method
5.1 This test method describes the design and use of various
2.2 ISO Standards:
types of current meters. These current meters are commonly
ISO 2537 Liquid Flow Measurement in Open Channels—
3
usedtomeasurethevelocityatapointinanopenchannelcross
Rotating Element Current Meters
section as part of a velocity-area traverse to determine the
ISO 3454 Liquid Flow Measurement in Open Channels—
3
flowrate of water. To this end it should be used in conjunction
Direct Depth Sounding and Suspension Equipment
with Test Method D 3858.
ISO 3455 Liquid Flow Measurement in Open Channels—
Calibration of Rotating-Element Current Meters in
6. Interferences
3
Straight Open Tanks
6.1 As with any intrusive flow measuring device, rotating
element current meters are subject to damage by debris,
especially in high velocity flows, and to fouling by floating
1
This test method is under the jurisdiction ofASTM Committee D-19 on Water
materials such as aquatic growths and sewage.
and is the direct responsibility of Subcommittee D19.07 on Sediments, Geomor-
6.2 Owing to bearing friction, each rotating element current
phology, and Open-Channel Flow.
Current edition approved Dec. 10, 1995. Published February 1996. Originally
meter has a limiting low velocity below which it does not
published as D 4409 – 84. Last previous edition D 4409 – 91.
2
Annual Book of ASTM Standards, Vol 11.01.
3 4
Published by International Standards Organization and available from Ameri- The boldface numbers refer to the list of references at the end of this test
can National Standards Institute, 11 W. 42nd St., 13th floor, New York, NY 10036. method.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D 4409
function reliably. This velocity is different for each type of 7.1.3.3 Iftherevolutioncountistobemademanuallybythe
meter but, in general, % errors tend to become large as the operator, the audible or visual signals (as distinguished from
velocities decrease below 0.1 to 0.2 ft/s (0.03 to 0.06 m/s). recorded signals) shall not occur at a frequency greater than 3,
and preferably 2.75, cps.
7
...

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