ISO TR 9824-2007 PDF

Full title and description

ISO/TR 9824:2007 — Hydrometry — Measurement of free surface flow in closed conduits. This technical report provides a concise synopsis of measurement methods applicable when closed conduits flow part full (i.e. with a free open water surface), describing techniques, equipment needs, attributes and limitations, and typical uncertainty levels for each method.

Abstract

ISO/TR 9824:2007 summarises available flow-gauging methods for free-surface conditions in closed conduits. For each method it gives a brief description, cross-references to other relevant International Standards, practical attributes and limitations, equipment requirements, and estimates of uncertainty. Uncertainties quoted are expanded uncertainties with a coverage factor k = 2 (approximately 95 % confidence).

General information

• Status: Published.
• Publication date: 2007 (publication listed as April 2007; implementation/availability noted 26 March 2007).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 17.120.10 (Flow in closed conduits / Hydrometry).
• Edition / version: Edition 1 (2007).
• Number of pages: 31 pages (official ISO publication).

Scope

This Technical Report provides a practical overview of methods suitable for measuring flows in closed conduits that are flowing part full (i.e. with a free surface). It does not define a single mandatory technique but rather presents available gauging options (velocity–area methods, current meters, ultrasonic transit-time, tracer/dilution techniques, float and surface-tracking approaches, and structure-based measurements where applicable), describes their applicability and limitations for closed-conduit free-surface conditions, and indicates expected levels of uncertainty and equipment considerations. The report also points users to relevant normative International Standards for detailed procedures.

Key topics and requirements

• Overview of measurement methods applicable to free-surface flow in closed conduits (velocity–area, current meters, ultrasonic/time-of-flight, tracer/dilution and surface-tracking/floats).
• Attributes, limitations and typical operating conditions for each technique (advantages, constraints, and suitability by flow regime and conduit geometry).
• Guidance on equipment requirements and installation considerations to obtain representative measurements.
• Estimated uncertainty ranges for methods — expanded uncertainties quoted with coverage factor k = 2 (≈95 %).
• Cross-references to related ISO standards and technical guidance for detailed measurement procedures and complementary techniques.

Typical use and users

Engineers, hydrometrists and technicians working in sewerage and drainage monitoring, wastewater and stormwater management, water utilities, environmental agencies, consulting firms, research institutions and manufacturers of flow-measurement instruments use this report as a quick-reference guide to select appropriate measurement techniques for closed conduits flowing part full and to understand expected uncertainty and equipment needs.

Related standards

ISO/TR 9824:2007 consolidates and supersedes earlier parts (ISO/TR 9824‑1:1990 and ISO/TR 9824‑2:1990) and cross-references a number of related International Standards for detailed methods and apparatus. Relevant references include ISO 772 (vocabulary/symbols), ISO 748 (open-channel measurement with current-meters/floats), ISO 5167 series (differential pressure devices), ISO 6416 (ultrasonic transit-time methods), ISO 8368 (guidance for structure selection in open-channel measurements), ISO 9555 series (velocity-area methods), ISO/TR 5168 and other technical specifications related to flow measurement practices. Users should consult those standards for prescriptive measurement procedures.

Keywords

hydrometry; closed conduits; free-surface flow; flow gauging; flow measurement; uncertainty (expanded); velocity–area; ultrasonic transit-time; tracer/dilution; current meter; hydrometric techniques.

FAQ

Q: What is this standard?

A: ISO/TR 9824:2007 is a technical report from ISO that provides a synopsis of methods for measuring free-surface flow in closed conduits (conduits running part full). It is guidance rather than a prescriptive single-method standard.

Q: What does it cover?

A: It covers brief descriptions of applicable gauging methods, their attributes and limitations, equipment and installation considerations, expected uncertainty levels (expanded uncertainties with k = 2), and pointers to other International Standards for detailed test procedures.

Q: Who typically uses it?

A: Hydrometrists, civil and environmental engineers, water and wastewater utilities, consultants, instrument manufacturers and researchers who need to select or understand flow-measurement techniques for closed conduits with free-surface flow.

Q: Is it current or superseded?

A: As published in 2007, ISO/TR 9824:2007 is the consolidated Technical Report replacing the earlier ISO/TR 9824‑1:1990 and ISO/TR 9824‑2:1990 documents. Users should verify on the ISO catalogue or with their national standards body for any later revisions or withdrawals.

Q: Is it part of a series?

A: It relates to the broader family of hydrometry standards (ISO/TC 113 outputs) and refers to multiple companion standards (e.g., ISO 5167 series, ISO 748, ISO 6416, ISO 8368, ISO 9555 series and ISO 772 for vocabulary). It functions as a Technical Report summarising methods rather than as a numbered part in a multi-part normative series.

Q: What are the key keywords?

A: hydrometry, closed conduit, free-surface flow, flow measurement, velocity–area, ultrasonic, tracer, current meter, uncertainty.