By installing a simple concrete weir or bump in the bottom of an existing concrete ditch, the height of the water flowing over the bump or weir is measured. Automated, solid-state data recording devices can be added to any measuring weir. These devices automatically measure and constantly record the amount of water flow passing through the measuring weir. The digital data can be either read manually or downloaded to a portable computer which will produce a permanent graph or record of the measured flow. They can be constructed from metal, concrete or fiberglass.
Standard designs are available to measure water over a wide flow range.
Flumes can operate in a flat ditch and require a pool upstream to reduce the approach velocity. Flumes can operate accurately over a wide range of flows. The velocity of water as it approaches the flume has little effect upon its operation. These conditions provide complete contraction of stream flow and the approach velocity of the water becomes negligible. This device is used on relatively flat ditches where fall in not adequate for a weir.