erosion on downstream edge of road
erosion on downstream edge of road
(OP)
A road crossing a Desert wash (Apache Junction,Az) is eroding on the downstream edge of the road. The road has a 4 inch layer of asphalt on it. It has scoured 2 ft. below grade on the downstream side and has eroded
about 2 ft. into and underneath road. Is there a formal engineering solution to this problem? I cannot locate typical discussions on USACE procedures or USFS techniques.
I appreciate any comments.
queque
about 2 ft. into and underneath road. Is there a formal engineering solution to this problem? I cannot locate typical discussions on USACE procedures or USFS techniques.
I appreciate any comments.
queque





RE: erosion on downstream edge of road
RE: erosion on downstream edge of road
Either a) install culvert or b) construct a cutoff wall per MAG Detail 552.
A scour analysis should be done either way.
RE: erosion on downstream edge of road
If you smooth out the channel, it will only flow faster, possibly creating more problems downstream.
Mike McCann
MMC Engineering
Motto: KISS
Motivation: Don't ask
RE: erosion on downstream edge of road
RE: erosion on downstream edge of road
RE: erosion on downstream edge of road
RE: erosion on downstream edge of road
I am having trouble accessing ADOT MAG Standards.
RE: erosion on downstream edge of road
RE: erosion on downstream edge of road
RE: erosion on downstream edge of road
RE: erosion on downstream edge of road
RE: erosion on downstream edge of road
RE: erosion on downstream edge of road
If you have erosion along the side of a pipe, that's undermining the road, there may be a "piping" problem that's occurring along the soil-to-pipe interface. When the floodwaters back up in their efforts to go into the inlet, there will be some hydraulic gradient acting on this interface. If the soils along the interface are not in intimate contact with the pipe, piping can occur from the outfall and upwards towawrd the inlet.
The "best" way to address this is to envelope the lower 1/3 of the pipe in gravel. That way, when the seepage forces exit into the gravel, the gravel is under confinement and piping can't progress.
In the absence of a photo, it's hard to know which of the approachs is best for your project. I have just seen three or four pipe failure from this mode.
f-d
¡papá gordo ain't no madre flaca!
RE: erosion on downstream edge of road
RE: erosion on downstream edge of road
Thx , queque
RE: erosion on downstream edge of road
RE: erosion on downstream edge of road
DRG
RE: erosion on downstream edge of road
RE: erosion on downstream edge of road
RE: erosion on downstream edge of road