i'm looking at adding culverts to a seasonal stream to make some road improvements. The state is requiring the culverts have a minimum of 18" of stone inside the bottom of the culvert so there is a natural stream bed. we would like to accomplish this with 36" or perhaps 42" Corrugated Metal Pipe, but i'm having trouble finding information about slope limitations for doing this. There is a pipe slope where we're just creating a water slide for rocks and i would like to understand those limits better. I'm not getting much out of the manufacturer reps i've reached out to, nor anything from the state either. anybody dealt with this and found info... or studied existing ones? fyi my slopes are 5%, 10%, 15% and 30%.
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