HDPE Detention Pond Riser
HDPE Detention Pond Riser
(OP)
Hey all,
The company that I presently work for (myself included) has designed a considerable number of moderate to large sized detention ponds. Since I started working for the company, it has been common practice for us to utilize CMP fabricated riser structures like the one shown in the photo below. During a recent project, a coworker and myself started discussing ways that we could revise our "standard" design & improve on the life/functionality of these systems. He proposed using HDPE pipe as an alternative to CMP, which makes sense as it will significantly extend the life of the riser. However, I have some concerns related to the functionality of using HDPE such as its sensitivity to UV radiation, and how one would assemble such a unit which can handle forces such as a cantilevered pipe extension or buoyant forces from the pond filling. These are issues that are not a concern when you weld CMP together.

Has anyone had experience with using HDPE in similar applications or have any insight on how this could be done?
Thanks in advance for any responses.
RE: HDPE Detention Pond Riser
You can get black HDPE or PE 100 which is UV resistant.
The issue with PE though is that it creeps over time when subjected to a reasonable level of stress, hence cantilevering anything is a risk.
And yes, it is slightly buoyant so you have that issue to look forward to.
CMP is Corrugated Metal Pipe?
The photo would help to know what we're looking at.
Remember - More details = better answers
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RE: HDPE Detention Pond Riser
RE: HDPE Detention Pond Riser
Just clamp your horizontal pipe down on that massive concrete block if you're worried about flotation.
Can't quite work out where the water is going, but should be easy to do for any decent PE fab shop.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: HDPE Detention Pond Riser
My glass has a v/c ratio of 0.5
Maybe the tyranny of Murphy is the penalty for hubris. - http://xkcd.com/319/
RE: HDPE Detention Pond Riser
RE: HDPE Detention Pond Riser
RE: HDPE Detention Pond Riser
Most on google do seem to be steel but a few are PE.
Some random people that make PE drain pipes etc - https://www.varitech.com/high-density-polyethylene...
At least one PE riser http://civilenginphotos.blogspot.com/2011/05/65-de...
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: HDPE Detention Pond Riser
If you go PE plan on making all of it a lot heavier.
And some form of reinforcement of gusseting may be called for.
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P.E. Metallurgy, consulting work welcomed
RE: HDPE Detention Pond Riser
RE: HDPE Detention Pond Riser