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Using rumble strips and speed bumps to move water off asphalt road

 
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Does anyone have experience using rumble strips to move water off an asphalt road?

Details:
I’m in the process of putting in a new asphalt road. I really don’t want to get in a debate about asphalt versus natural building. Let’s take the road as a given. The road collects a significant volume of water from about 8 acre watershed and slowly moves it at around a 1% grade to the top of my property. I was originally thinking of putting in a culvert but was thinking that a series of rumble strips and a speed bump on a 30 degree angle to road might be useful to move that water off to a swale that’s already there.

How well do rumble strips or speed bumps slow and move water? What are the gotchas with this idea?

Thanks!
 
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Leaving aside for a moment the whole asphalt thing, let's address the movement of water.

Just putting in the road with a crown appropriate for shedding water to either side of the road should work. Water moves off of flat surfaces pretty well if they are at all inclined.

Also, putting in rumble strips decreases the amount of road surface area in contact with the tires at any given time. I suppose this might work if you have a perpetually covered piece of roadway and the rumble strips were exactly the right depth to drop the water under the top of the ridges, but why?

It seems to me that just building the road properly will get you what you want. Why reinvent the wheel?

Also, I strongly suggest that you consider where the road is draining to. That area would probably do well with a reed bed system, and regular fungal slurry applications, especially if the water is going to be harvested to grow anything edible, or make its way into any waterways.

And I know you don't want to get into a pro/con on asphalt. You know it's toxic shit, and that it contaminates all water that it comes in contact with, and you're smart enough to take that kind of prolonged, persistent poisoning of your land seriously. But why asphalt?

-CK
 
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Notwithstanding the asphalt issue, an asphalt speed hump would work well, concrete type rumble strips would not work as well as they're not massive enough to divert water.

I'm guessing it's a very low speed road, so crossfall and super elevation aren't necessary.

In regards to the speed hump, I suggest you Google 'Watts Profile Speed Humps' to obtain the design criteria. These are regularly used on roads, so are designed to be easy to drive over at acceptable speeds with machinery and without undue shock. And, they divert water very well.

One of the important considerations is to key it into the bitumen of the road so it last.
 
Chris Kott
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Maybe I'm having a hard time visualising how this would work. I don't understand why it's not possible to alter the camber (I think that's the term, pitch, but for road surfaces) of the roadway to put the water where you want it.

What is it about the specific situation that requires a mechanism other than gravity and a slight slope to gather water?

-CK
 
Radhe Webster
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One of the reasons I want to use rumble strips is to move the water off from the first 6 feet of asphalt. It will be coming into the asphalt from a gravel road that is very flat and I want to make sure the water doesn’t run down the asphalt any longer than it has to.

I could try pitching the road but I’m concerned the angle is just going to dig a channel on the side of the road and I want to move it to a low enough spot where it could never get back to that channel.
 
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