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  1. GrahamC001

    Submerged Weir Discharge Computation

    Don't know if you are still interested, but I did some investigation of this a couple of years back. We were dealing with a weir operating v close to modular limit, so the position of this and further drowning effects was important. I compared formulae/charts provided by Ackers (1971); King...
  2. GrahamC001

    Overflow Nappe Ventilation

    Hi, We are designing an overspill gate weir and need to ensure ventilation of the the nappe to avoid vibration. Designing the vent pipes is proving to be a bit of a challenge. Can you suggest any references we can refer to? In general sizing is OK, but what is not clear is what reduction in...
  3. GrahamC001

    Scour Protection Sizing Downstream of Level Invert Hydraulic Structure

    I have a common problem relating to sizing of rock armour downstream of a number of existing low head (~2m) gated hydraulic strucutres with a level invert/apron (ie no stilling basin). In the absence of good downstream scour protection these structures typically dig a hole in the river bed...
  4. GrahamC001

    Siphon - Requirement for Submerged Discharge?

    Colleagues, I am designing a pipe siphon to effect the drawdown of a reservoir under emergency conditions. To give a sense of scale I've done a preliminary sizing at 0.5m dia. I've struggled to find any good guidance on the design of this type of installation (there seems to be plently out...

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