max. gradient for open bottom corrugated metal arch
max. gradient for open bottom corrugated metal arch
(OP)
Looking for an pinion on what might be considered the max. design gradient for an open botton arch drainage structure.
I have a site that has a natural stream grade of 10%, a design flow of 3.5 m3/s, with a design HW/D of around 0.5 to minimize backwater effect and piping.
At what point should a tie back system be considered?
I have a site that has a natural stream grade of 10%, a design flow of 3.5 m3/s, with a design HW/D of around 0.5 to minimize backwater effect and piping.
At what point should a tie back system be considered?





RE: max. gradient for open bottom corrugated metal arch
RE: max. gradient for open bottom corrugated metal arch
RE: max. gradient for open bottom corrugated metal arch
I have typically limited arches to under 6%, but the road alignment on this crossing is well suited for this type of structure. The arch was chosen as the stream is fish bearing, and in our jurisdiction all fish bearing stream are limited to open bottom structures.
RE: max. gradient for open bottom corrugated metal arch
One option to protect against local scour if you intend to stick with the open bottom metal arch is to construct a cutoff wall across both the inlet and outlet ends of the culvert to control the invert grade inside the culvert. The wall would typically be part of the headwall structure.
RE: max. gradient for open bottom corrugated metal arch
Thanks for the advice.
RE: max. gradient for open bottom corrugated metal arch
RE: max. gradient for open bottom corrugated metal arch
RE: max. gradient for open bottom corrugated metal arch