Normal Depth Calculations - Rectangular channel
Normal Depth Calculations - Rectangular channel
(OP)
I have seen a couple of normal depth of flow calculations which use the formal q = 1.71bh^(3/2) where h is the depth of flow and b is width of rectangular channel.
However i don't seem to find this supported in any text book.
I'm reviewing a hydraulic profile of a treatment works and i need to check some depth of flows in some channels.Can anyone help me with the right application of the above formula. I'm not considering channel slope.
Waiting....! thanks
However i don't seem to find this supported in any text book.
I'm reviewing a hydraulic profile of a treatment works and i need to check some depth of flows in some channels.Can anyone help me with the right application of the above formula. I'm not considering channel slope.
Waiting....! thanks





RE: Normal Depth Calculations - Rectangular channel
Try this link:
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good luck
RE: Normal Depth Calculations - Rectangular channel
RE: Normal Depth Calculations - Rectangular channel
Since the channel is flat you are dealing with a flow driven by a hydraulic head. It is also called a gradually varied flow as the flow depth gradually changes along the channel.
You need to know the flow depth at a certain section along the channel from which you can calculate flow depths upstream or downstream. This process requires some iterations as you have to determine such water surface slope that drives the particular discharge.
This basic paper gives you the essential background
http://
and at the same address : http://www.efm.leeds.ac.uk/CIVE/CIVE2400/ you can even find some spreadsheets to calculate such cases.
There also many on-line calculators that give you the answer but do not believe in all black box generators. I think that the following link provides both the methods and the results. http://www.lmnoeng.com/Channels/gvf.htm
Good luck