ISO 8368 pdf download

ISO 8368 pdf download.Hydrometric determinations — Flow measurements in open channels using structures — Guidelines for selection of structure 1 Scope This International Standard gives guidelines for selection of a particular type of flow-gauging structure for measurement of liquid flow in open channels. It sets out the factors, and summarizes the parameters which may influence such a selection. NOTE In general, a flow-gauging structure is used when high accuracy is required for continuous records of flow. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents listed below. For undated references, the latest edition of the normative document referred to applies. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 772, Hydrometric determinations — Vocabulary and symbols. ISO 1438-1, Water flow measurement in open channels using weirs and Venturi flumes — Part 1: Thin-plate weirs. ISO 3846, Liquid flow measurement in open channels by weirs and flumes — Rectangular broad-crested weirs. ISO 3847, Liquid flow measurement in open channels by weirs and flumes — End-depth method for estimation of flow in rectangular channels with a free overfall. ISO 4359, Liquid flow measurement in open channels — Rectangular, trapezoidal and U-shaped flumes. ISO 4360, Liquid flow measurement in open channels by weirs and flumes — Triangular-profile weirs. ISO 4362, Measurement of liquid flow in open channels — Trapezoidal profile weirs. ISO 4371, Measurement of liquid flow in open channels by weirs and flumes — End depth method for estimation of flow in non-rectangular channels with a free overfall (approximate method). ISO 4374, Liquid flow measurement in open channels — Round-nose horizontal broad-crested weirs. 5 Factors affecting choice 5.1 General The factors which affect choice can be considered under the following headings: a) purpose; b) range of flow; c) afflux; d) size and nature of channel; e) channel slope and sediment load; f) operation and maintenance; g) environmental impact; h) passage of fish; i) cost. 5.2 Purpose Table 1 tabulates the various structures and indicates some of the purposes for which they may be applicable, together with guidelines to their limitations. The purpose for which the...