ISO Standards BS EN ISO 748-2021 pdf free download – Hydrometry — Measurement of liquid flow in open channels — Velocity area methods using point velocity measurements BS EN ISO 748-2021 pdf free download - Hydrometry — Measurement of liquid flow in open channels — Velocity area methods using point velocity measurements. 5.2.1 A permanent station, or one likely to be used frequently for... 02-10 Download Now