Difference between revisions of "Flow through an orifice"

Latest revision as of 19:57, 17 March 2019

Orifices are simply holes which restrict the flow of water. They may be used at the bottom end of an LID practice to add some flow control:

$Q=B\times C_{d}\times A_{o}{\sqrt {2\cdot g\cdot h}}$

Where:

B is the clogging factor (between 0.5 (for matured installation) and 1 (for a new perfectly performing orifice)),
C_d is the coefficient of discharge (usually 0.61 for a plate, or 0.8 for a pipe),
A_o is the area of the orifice (m²),
g is acceleration due to gravity = 9.81 m/s², and
h is the head of water over the centre of the orifice (m).

Revision as of 19:49, 17 March 2019 (view source) Jenny Hill (talk \| contribs) m ← Older edit		Latest revision as of 19:57, 17 March 2019 (view source) Jenny Hill (talk \| contribs) m
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−	Orifices are simply holes which restrict the flow of water. They may be used at the bottom end of an LID practice to add some [[flow control]].	+	Orifices are simply holes which restrict the flow of water. They may be used at the bottom end of an LID practice to add some [[flow control]]:

	<math>Q= B\times C_{d}\times A_{o}\sqrt{2\cdot g\cdot h}</math>		<math>Q= B\times C_{d}\times A_{o}\sqrt{2\cdot g\cdot h}</math>