Upstream flow greater than downstream flow - --- is this possible?
Upstream flow greater than downstream flow - --- is this possible?
(OP)
I have a task of measuring low flows in a stream using a pygmy meter. Although for the most part the result shows flow generally increases as I go downstream, there are some places where an upstream flow is greater than the next one downstream. I am very skeptical about the later finding and would like to know under what circumstance will upstream flow be greater than downstream flow. You help is highly appreciated.
Thanks.
Thanks.
RE: Upstream flow greater than downstream flow - --- is this possible?
Unless there are losses or diversions, the total flow (velocity x cross-section) will generally increase as you go downstream. The velocity, however, will depend on the exact stream characteristics at any given point, rather than the upstream/downstream location.
Peter Smart
HydroCAD Software
www.hydrocad.net
RE: Upstream flow greater than downstream flow - --- is this possible?
Thanks.
RE: Upstream flow greater than downstream flow - --- is this possible?
http://www.rickly.com/sgi/pygmy.htm
Peter Smart
HydroCAD Software
www.hydrocad.net
RE: Upstream flow greater than downstream flow - --- is this possible?
Hydrology, Drainage Analysis, Flood Studies, and Complex Stormwater Litigation for Atlanta and the South East - http://www.campbellcivil.com
RE: Upstream flow greater than downstream flow - --- is this possible?
http://www.advmnc.com/JBS/AQ.html
Thanks.
RE: Upstream flow greater than downstream flow - --- is this possible?
Anyway, the device still requires manual input for the position and channel width, correct? There's a lot going on in that (black) box, and it seems that you need to take a closer look at exactly what it's doing. Basically, you need to be able to replicate and verify all the calculations it's doing.
BTW: Please avoid posting the same question in two forums. It just gets confusing and wastes other people's time.
Peter Smart
HydroCAD Software
www.hydrocad.net
RE: Upstream flow greater than downstream flow - --- is this possible?
You are right I should not have posted the same question in two forums. What happeded was that I first posted it in the modeling forum and later made the decision to repost it in the storm/flood engineering forum since the question is more in place with this forum. My appologies. Anyway I can take of them off the forum?
RE: Upstream flow greater than downstream flow - --- is this possible?
Peter Smart
HydroCAD Software
www.hydrocad.net