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Free standing masonry wall downstream from wetpond

Free standing masonry wall downstream from wetpond

Free standing masonry wall downstream from wetpond

(OP)
Jurisdiction is requiring a 7' masonry wall (block fence, basically) around a site. We have a wetpond SCM on site, over-sized to meet pre-post for a 100 year storm. I can size orifices in the wall to accommodate, but from an aesthetic standpoint, wondering if there is a best practice of form to meet this function; when I asked the structural, he basically shrugged and told me to tell him where and how many holes I wanted.

And of course, higher intensity storms than the 100-year will activate the spillway and a considerable amount of water will be headed towards this wall which will basically act as another dam; what size storm should I design for? Thoughts appreciated if anyone has ever come across this.

RE: Free standing masonry wall downstream from wetpond

Whats the question exactly?

For storms greater than 100yr you have to get the flooD water out of the site but there is a wall in the way and your wondering whats the best way to get the water through/or over the wall?

RE: Free standing masonry wall downstream from wetpond

(OP)
Correct, and also what size storm greater than 100-year should I aim for here?

RE: Free standing masonry wall downstream from wetpond

it all depends on a number of things that you need to answer before a good answer will be found:


  • how much water would hit the wall?
  • what will be inundated by the water?
  • if the wall breaks, what gets flooded?
  • Will the overflow and ponding put people at risk?
  • will you be creating a new floodplain?
  • Can you let the water through the wall, or let it pond behind, or will it flow around the end of the wall?
  • Will erosion undermine the wall?
If you want to take the wall out of the equation, put in a screened open section or break away panel.

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