BS 3680-4F: 1990 ISO 4374:1990 : Measurement of liquid flow in open channels — Part 4: Weirs and flumes — Part 4F: Round nose horizontal broad-crested weirs
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This International Standard deals with the
measurement of flow in rivers and artificial
channels under steady flow conditions using
round-nose horizontal broad-crested weirs
(see Figure 1 and Figure 2).
The flow conditions considered are limited to
steady flows which are uniquely dependent on the
upstream head. Drowned flows, which depend on
downstream as well as upstream levels, are not
covered by this International Standard.
The round-nose horizontal broad-crested weir
has a good discharge range and modular limit and is
appropriate for use in small- and medium-sized
installations. It is particularly robust and
insensitive to minor damage.
BS 3680-4F: 1990 ISO 4374:1990 : Measurement of liquid flow in open channels — Part 4: Weirs and flumes — Part 4F: Round nose horizontal broad-crested weirs