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culvert lining mixture

culvert lining mixture

culvert lining mixture

(OP)
Specifications often require the mixing of round river stone with native materials at the invert of stormwater culverts. Does anyone have a standard ratio of mixing these items?

RE: culvert lining mixture

Do you mean in the culvert or at the outlet?  I've never heard of mixing the two.  Why would you do that?

RE: culvert lining mixture

(OP)
This mixture is in the culvert. The Ministry of Fisheries often ask for the invert of culverts to be lined with native material and/or stone, to protect the aquatic life from the abrasiveness of the culvert material. The outlets here in Ontario Canada are generally Rip Rap material.  

RE: culvert lining mixture

Okay - I've never heard of that, but then out here in the desert SW we don't generally put in culverts that run all the time.  

To your question though, it would depend on the gradation of the "native material", potential velocity, culvert material, etc.

RE: culvert lining mixture

If I understand what you are asking, the answer is it should match the existing stream bed as close as practial. Hope this helps

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