Document Details |
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| Name of Department/Committee : | WRD 01 | ||||
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| Document Number : | WRD 01 ( 23721) | ||||
| Document Title [English] : | FLOW MEASUREMENT STRUCTURES RECTANGULAR TRAPEZOIDAL AND U-SHAPED FLUMES | ||||
| Document Title [Hindi] : | प्रवाह मापन संरचनाएं — आयताकार समलंबी और यू — आकार अवनालिका | ||||
| Document Type : | Revision | ||||
| Language : | English | ||||
| Priority : | 3 | ||||
| ICS Code : | 17.120.20 | ||||
| Date of Project Approval : | 20-01-2023 | ||||
| Standards to be Revised : |
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| Standards to be Superseded : |
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Classification Details |
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| Group : | Civil Engineering Design and Construction |
| Sub Group : | Hydrometry and equipments |
| Sub Sub Group : | Hydrometry & Equipments |
| Aspects : | Code of Practice |
| Risk : | None |
| Certification : | None |
| Short Commom Man's Title : | |
| ITCHS Code : | |
| Ministry : |
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| Sustainable development Goals : | |
| Degree of Equivalence : | Identical under dual numbering |
| Identical/Equivalent Standards : | ISO 4359 |
| Organization Type: | ISO |
| Sl.No. | Synosis Points | |
| 1 | 6.1.2 a) and 6.2.3.2 b) have been revised with respect to the flume approach conditions | |
| 2 | Errors that were introduced in Amendment ISO 4359:2013/Amd.1:2017 have been corrected | |
| 3 | An acknowledgement has been added that some of the specified tolerances can be difficult to achieve in some installations | |
| 4 | The spreadsheets have been revised to provide further advice if parameters are outside the applicability range of the curve-fitting formulae for the relative boundary layer thickness (δ*/L). | |
| 5 | The first edition of this document (ISO 4359:1983) had an additional limitation requiring that the gauged head, h, be not more than 2 m. However, there is no technical justification for this restriction, so it does not appear in the second and third editions of this document. | |
| 6 | In 11.4.7 and 12.4.7, although the relationship of Cs with mHe/be varies very slightly with flume geometry and the value of the boundary layer displacement thickness, this variation was disregarded when applying the coefficient method in the first edition of this document, as a single graphical relationship was provided for trapezoidal flumes. This approximation has been remedied in the second and third editions of this document. | |
Timeline Details |
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Stages |
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| Sl. No. |
Stage | Date of Occurence | Remarks | Circulated to | Files |
| 1 | Generation of Document Number | 20-01-2023 | ------- | ||
| 2 | P-Draft Waived | 06-10-2023 | Committee decided to circulate the IS in wide circulation | ------- | |
| 3 | WC Draft | 06-10-2023 | Duration : 62 Days Submitted for HOD approval |
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| 4 | WC Draft | 19-10-2023 | WC approved by HOD |
WRDC | ------- |
| 5 | WC Draft | 19-10-2023 | WC approved by HOD |
WRDC | ------- |