BS ISO 4360-2020,Hydrometry — Open channel flow measurement using triangular profile weirs.BS ISO 4360-2020 pdf free download.
BS ISO 4360-2020 specifies methods for the measurement of the flow of water in open channels under steady flow conditions using triangular profile weirs. The flow conditions considered are steady flows which are uniquely dependent on the upstream head and non-modular (drowned) flows which depend on downstream as well as upstream levels.
2 Normative references
ISO 772, Hydrometry – Vocabulary and symbols;
5 Principle
The discharge over a triangular profile weir is a function of the upstream head on the weir (for modular flow),upstream and downstream head (for non-modular flow),the geometrical properties of the weir and approach channel and the dynamic properties of the water.
6 Installation
6.1 General
The required conditions regarding selection of site, installation conditions, the measuring structure the approach channel, the downstream channel, maintenance, measurement of head, and gauge wells which are generally necessary for flow measurement are given in the following subclauses.
6.2 Selection of site
A preliminary survey shall be made of the physical and hydraulic features of the proposed site, to check that it conforms (or can be made to conform) to the requirements necessary for accurate measurement by a weir.

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