CG: n
CT: Calibrating a Parshall flume.
Decrease water velocity: If the water velocity is too fast, the relationship between depth and velocity will be way off A small increase in depth will give you a disproportionately large change in discharge rate. You need to find some way to dissipate the velocity energy, and that will result in an increase in depth of flow. You can see if there is room in the pipe for artificial barriers, which will slow down the flow, or you can rebuild the inlet box on the flow meter.
If you are going to rebuild the flow meter entrance box, then read either the ISCO Open Channel Flow Measurement Handbook or, on the Web, chapter eight of the U.S. Bureau of Reclamation’s “Water Measurement Manual.”
When rebuilding the entrance box, bring the flow in at a right angle to the flow meter (even from the bottom is fine), and give it a hard surface on which to dissipate the energy of the stream. Then your flow meter will work just fine.
S: http://www.chemicalprocessing.com/articles/2004/216/ (last access: 24 October 2014)
N: 1. flow (n): mid-15c., “action of flowing,” from flow (v.). Meaning “amount that flows” is from 1807. Sense of “any strong, progressive movement comparable to the flow of a river” is from 1640s. Flow chart attested from 1920 (flow-sheet in same sense from 1912).
meter (nm): “device for measuring,” abstracted 1832 from gas-meter, etc., from French -mètre, used in combinations (in English from 1790), from Latin metrum “measure” or cognate Greek metron “measure”. Influenced by English meter “person who measures” (late 14c., agent noun from mete (v.)).
2. Scientific Instruments; Hydrology and Hydrography: Instrument for measuring the rate of flow in a conduit or open channel.
S: 1. OED – http://www.etymonline.com/index.php?allowed_in_frame=0&search=flow+meter&searchmode=none (last access: 24 October 2014). 2. TERMIUMPLUS.
OV: 1. flowmeter. 2. flow-meter.
S: 1. TERMIUMPLUS. 2. GDT; TERMIUMPLUS.
SYN:
S:
