Normal depth vs Critical depth
Normal depth vs Critical depth
(OP)
Hi
I have the follwoing question
In which cases should I use normal depth as design parameter for gravity flow in pipes? I know that for culverts I have to make an analysis of the critical depth and determine the flow profile as critical or sub critical since the capacity of the pipe can not by calculated with manning equation.... When can I use the manning equation then?
I have the follwoing question
In which cases should I use normal depth as design parameter for gravity flow in pipes? I know that for culverts I have to make an analysis of the critical depth and determine the flow profile as critical or sub critical since the capacity of the pipe can not by calculated with manning equation.... When can I use the manning equation then?





RE: Normal depth vs Critical depth
RE: Normal depth vs Critical depth
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Critical flow is unstable because small changes in roughness or bed slope produce relatively big changes in depth. The water surface for flow at critical depth appears wavy due to these instabilities. It is poor engineering practice to design channels so that water flows at critical depth. The only time we want to intentionally force critical flow is either for flow measurement or flow control of some type.
In general, storm drainage systems shall be designed so as to maintain a minimum velocity of flow of 2.5 feet per second and a maximum velocity of 10 feet per second when flowing full. Check this requirement with your local agency having authority.
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