Assist
Assist
(OP)
When do you use box culverts instead of circular culverts
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RE: Assist
1) greater capacities are req'd. (fill ht. and or volume of h20) ....boxes come in larger sizes
2) there is the ($savings) practicality of casting in-place, vs. precast pipe or precast box.
Reinforced Concrete Pipe or RCP (cir. conc. pipe) standard sizes are:18,24,30,36,48, and 54", There are larger sizes...from about 42" on up it becomes significantly harder to place, connect and backfill CORRECTLY especially when placing double or triple sections in the same location.
My answer to your question would be money....if the hyd. needs can be met with both items.
RE: Assist
Then comes plastic pipes. They seem to be used a lot, but I have no idea about longevity.
Think about problems that may come from erosion at the ends and possible failure by taking out the earth support, which can happen with concrete pipes. Flexibility has some benefit where erosion may take place.
Load carrying ability is something the salesmen will give you all sorts of scoop on. It is amazing what earth arching can do.
RE: Assist