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  1. bhauth

    concrete weir design, like a retaining wall, but only water

    None of the last 2 comments have any merit for the scope and context of this structure. Its not technically a "weir," It is basically a dam at a set elevation that will allow water to divert down a ditch if the water surface gets high enough. This diversion will lead INTO our Impoundment...
  2. bhauth

    concrete weir design, like a retaining wall, but only water

    Ok, so on my FBD, I'll use the unit weights of the saturated soil on top of my footing, the weight of the concrete, and the weight of the water on top of the upstream side of the footing as my clockwise moments. I'll use the lateral water pressure as my counterclockwise moment placed at 1/3 of...
  3. bhauth

    concrete weir design, like a retaining wall, but only water

    Yeah, that's what I thought the Equivalent Surcharge would be. The program that I'm using is just making things more confusing than they really are. I will just keep things separate and do my stability analysis by hand. Technology is useful if I can fully understand it.
  4. bhauth

    concrete weir design, like a retaining wall, but only water

    Do any of you have an equation for "Surcharge as an equivalent soil height"? My unit weight of soil is 120 pcf. Water is 62.4 pcf.
  5. bhauth

    concrete weir design, like a retaining wall, but only water

    meicz - The flow through the gate IS continuous. So I think it is safe to assume the soil is saturated at all times on both sides.
  6. bhauth

    concrete weir design, like a retaining wall, but only water

    The weir will have a gate which can be closed in the case of flooding downstream to "back up" the water behind it. 99% of the time, this gate will be open and water will be allowed to flow freely. The gate will only be closed during a flooding situation. I've included a quick sketch of what...
  7. bhauth

    concrete weir design, like a retaining wall, but only water

    The design case for water level on the other side would be at the bottom of the ditch, basically the top of the ground level. I've designed it for the bottom of the foundation to be 5' below the surface, (for frost depth). This is basically quite a small structure compared with what you are...
  8. bhauth

    concrete weir design, like a retaining wall, but only water

    Yes, the soil on both sides of the weir will be saturated. I just didn't know if one side was passive and the other side used active earth pressure or what was safe to assume. So the only overturning force I will have will be the force of the water?
  9. bhauth

    concrete weir design, like a retaining wall, but only water

    I am designing a concrete weir to be placed in a ditch for a project I'm working on. The basic layout is that of a cantilever retaining wall, except the soil height is the same on both sides of it. It is designed to hold water back up to the height of the top of the wall. Do the lateral earth...
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