SIST ISO 1438:2018 PDF

Name: SIST ISO 1438:2018 — Hydrometry - Open channel flow measurement using thin-plate weirs
SKU: SIST ISO 1438:2018
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Hydrometry - Open channel flow measurement using thin-plate weirs

Название (английский):

SIST ISO 1438:2018

Hydrometry - Open channel flow measurement using thin-plate weirs

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 65
Дата публикации:: 19 апреля 2018 г.
ICS:: 17.120.20
Технический комитет:: IMIN - Measurement instruments

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Описание (английский):

ISO 1438:2017 defines the requirements for the use of rectangular and triangular (V-notch) thin-plate weirs for the measurement of flow of clear water in open channels under free flow conditions. It includes the requirements for the use of full-width rectangular thin-plate weirs in submerged (drowned) flow conditions.

Abstract

Overview

Key topics and technical requirements

Weir types and specifications
- Rectangular thin‑plate weirs (including full‑width forms)
- Triangular (V‑notch) thin‑plate weirs with specified notch‑angle ranges (document includes treatment for notch angles between ≈20° and 100°)
Installation and site selection
- Requirements for approach and downstream channel geometry, weir mounting and flow straightening
- Guidance on stilling wells, head‑measurement sections and gauge zero determination
Head measurement
- Instrumentation and placement rules for upstream and downstream gauges; use of stilling/float wells
Discharge formulae and coefficients
- Standard discharge relations (e.g., Kindsvater‑Carter for rectangular weirs; Kindsvater‑Shen for triangular weirs)
- Treatment for modular and non‑modular flow; special provisions for weir plate heights (e.g., supplemented modular formula for p in the 1.0–2.5 m range)
Uncertainty and performance
- Methods for combining measurement uncertainties, evaluation of uncertainty of discharge coefficients, and sample uncertainty budgets
Maintenance and practical considerations
- Routine inspection, calibration and limits on geometrical/operational parameters (head, submergence, approach conditions)

Practical applications and users

This standard is intended for professionals needing reliable open‑channel flow measurement, including:

Hydrometrists and water resources engineers - gauging rivers, streams and service channels
Environmental agencies and regulators - compliance monitoring and environmental flow assessments
Irrigation managers and reservoir/dam operators - allocation, intake monitoring and spill measurements
Consultants and researchers - design, calibration and uncertainty analysis of gauging structures

Typical applications: permanent gauging stations, temporary weir installations, small‑weir tanks for calibration, and monitoring sites requiring traceable, standardized discharge estimates.

Related standards

ISO 772 - Hydrometry: vocabulary and symbols (normative reference used by ISO 1438)
Other hydrometry and flow‑measurement standards and national guidance documents on gauging station design and measurement uncertainty.

Keywords: ISO 1438, SIST ISO 1438, thin‑plate weir, open channel flow measurement, V‑notch weir, rectangular weir, discharge coefficient, head measurement, hydrometry, flow measurement standard, measurement uncertainty.

Технические детали

SKU: SIST ISO 1438:2018

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ISO 1438:2017

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