Crested Weir Wall Design
Crested Weir Wall Design
(OP)
I believe I have the terminology correct in the title. I'm designing a concrete wall V-notch weir. It is about 15 feet tall at the middle and 300 feet overall length. My questions has to do with the concrete wall forces.
1. In the vicinity of the weir, will I have added forces on the wall due to the moving water through the weir?
2. If the water over-tops the wall by 1.0 feet, will I have added forces on the wall due to the moving water over top of the wall?
If I have added forces, how are they calculated? I know the flow rates of the water through the weir and over the wall.
Thanks for your assistance.
Rich
1. In the vicinity of the weir, will I have added forces on the wall due to the moving water through the weir?
2. If the water over-tops the wall by 1.0 feet, will I have added forces on the wall due to the moving water over top of the wall?
If I have added forces, how are they calculated? I know the flow rates of the water through the weir and over the wall.
Thanks for your assistance.
Rich





RE: Crested Weir Wall Design
RE: Crested Weir Wall Design
What I want to know is if the moving water is also putting a force on the back side (upstream) of the wall due to moving water in the vicinity? Is there a significant horizontal force against the wall due to the moving water above the wall, that needs to be included in my design, or is it just the hydro static water head pushing on the wall?
Rich
RE: Crested Weir Wall Design
RE: Crested Weir Wall Design
1. Forces due to debris strikes during storm events (logs etc.)
2. Strikes of ice flows (depends on location).
RE: Crested Weir Wall Design
I can see this as being primarily static pressure as this is a settlement pond and the water rises until it tops the wall, they spills over. The weir is also always active. Regarding ice, this is in Texas and ice is not a problem in this area. It is a good thought though.
My next question would be when does it change from a pond type condition to more of a flowing stream? I'm not saying this will be a flowing stream, but in general, I see a flowing stream as having momentum behind it and a wall would be a barrier and need to hold back the flowing pressure. Just a curiosity question.
Rich
RE: Crested Weir Wall Design
unless you have a trash rack to prevent it, trash including logs could impact the wall. also, is there a chance that the weir could get partially blocked with debris, causing the water level to rise?