Redirecting River Flow To Protect Bridge Approach - Excavation & Site Work - Contractor Talk

Redirecting River Flow To Protect Bridge Approach

 
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Old 09-22-2018, 07:00 PM   #1
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Redirecting River Flow To Protect Bridge Approach


I have an excavation/hydrodynamics/something or other issue that I could use some help with.

We have a farm on a river.
We had a bridge built a few years ago to replace an old and failing one.
Bridge is great.

Only problem is that one of the approaches has been washed away.... way too many times when the river hits flood stage.
Twice this year alone.
Just this week because of the heavy Florence rains.

It's our vacation spot, and I'm busy, so we had the farmer down the road redo it when it happened in April....to the tune of $7k (split with our neighbor).

Apparently the neighbor has had it redone 10 or so times.

I think that is just ridiculous and that there must be a permanent fix we can come up with.

This isn't my especiality.

I could really use some help from you guys that understand this kind of thing.
My lady's dad is flying up from Tennessee this week to do it with me, and I'd like to have a solid plan in place.

Here is a Google Earth image at regular water level.
You can see the right side approach which is lined with larger boulders and filled with 57's.
I'll load pics from my phone in a second to show what the flooding did, and tomorrow morning I'll get my drone up there and take some good shots.

Thanks in advance,
Any help is greatly appreciated,
Jonathan
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Old 09-22-2018, 07:09 PM   #2
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Old 09-22-2018, 07:22 PM   #3
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Old 09-22-2018, 08:08 PM   #4
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Re: Redirecting River Flow To Protect Bridge Approach


concrete and steel.
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Old 09-22-2018, 08:11 PM   #5
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Re: Redirecting River Flow To Protect Bridge Approach


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concrete and steel.
And lots of it.

Lots.
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Old 09-22-2018, 09:03 PM   #6
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Re: Redirecting River Flow To Protect Bridge Approach


you'd have to consult with engineers for a permanent solution. It would require getting the entire approach above the high water mark. You may or may not have regulatory agencies to deal with if it's a permanent watercourse
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Old 09-22-2018, 09:04 PM   #7
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Re: Redirecting River Flow To Protect Bridge Approach


If it overtops the bridge, any soil will become unstable and wash out.
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Old 09-22-2018, 09:32 PM   #8
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Re: Redirecting River Flow To Protect Bridge Approach


Rip-Rap. 1 ton or bigger.

And lots of it.

Get it out a little farther, in a nice semi-circle.

But with that kind of flooding, you'll be redoing it anyway.
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Old 09-22-2018, 10:03 PM   #9
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Re: Redirecting River Flow To Protect Bridge Approach


Don'r think of this as a bridge, think of it as a culvert and a dam.

You get the most flow through a culvert if everything leading to it is smooth, plus a smooth culvert.

Dams have to have smooth tops and downstream face. Turbulent flow from things like big rocks just makes erosion happen much faster. Usually it would just get smoothed with concrete, dince water flowing over it degrades it slowly. That also means the upstrem sude needs concrete as well, or the hydrostatic pressure will just push it off the downstream side.

The pic looks like the bridge encroaches on the original channel, so it's a choke point. Conceptionally, it should have been elevated above flood levels, so it would wing up being several spans. Long term you nay want to add a span, and let it wash out under that span.
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Old 09-22-2018, 10:06 PM   #10
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Re: Redirecting River Flow To Protect Bridge Approach


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Old 09-22-2018, 11:49 PM   #11
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Re: Redirecting River Flow To Protect Bridge Approach


I think this is one of those times an engineer would be money well spent.


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Old 09-23-2018, 01:43 AM   #12
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Re: Redirecting River Flow To Protect Bridge Approach




This is as high as it got last week.

It doesnít get above the bridge, but you can see why it ruined the approach.


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Old 09-23-2018, 01:47 AM   #13
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Re: Redirecting River Flow To Protect Bridge Approach


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Don'r think of this as a bridge, think of it as a culvert and a dam.



You get the most flow through a culvert if everything leading to it is smooth, plus a smooth culvert.



Dams have to have smooth tops and downstream face. Turbulent flow from things like big rocks just makes erosion happen much faster. Usually it would just get smoothed with concrete, dince water flowing over it degrades it slowly. That also means the upstrem sude needs concrete as well, or the hydrostatic pressure will just push it off the downstream side.



The pic looks like the bridge encroaches on the original channel, so it's a choke point. Conceptionally, it should have been elevated above flood levels, so it would wing up being several spans. Long term you nay want to add a span, and let it wash out under that span.


I was thinking 5-10 huge culvert pipes set in concrete, sloped on both sides, at the height of the bridge.

Lots of concrete......
But I think it would last.

Do you think redirect so not totally perpendicular to the flow?

Angled downstream a bit?


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Old 09-23-2018, 01:50 AM   #14
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Re: Redirecting River Flow To Protect Bridge Approach


Quote:
Originally Posted by hdavis View Post
The pic looks like the bridge encroaches on the original channel, so it's a choke point. Conceptionally, it should have been elevated above flood levels, so it would wing up being several spans. Long term you nay want to add a span, and let it wash out under that span.


What you are seeing there is a ford built by the neighbor to get heavy equipment across the river to build his house back before the new bridge was done.

Iím thinking it exacerbated the situation.
Changed the flow pattern and directed it to the approach.


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Old 09-23-2018, 01:52 AM   #15
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Re: Redirecting River Flow To Protect Bridge Approach


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you'd have to consult with engineers for a permanent solution. It would require getting the entire approach above the high water mark. You may or may not have regulatory agencies to deal with if it's a permanent watercourse


Yeah....regulatory agencies.

Iíll give em a call first thing in the morning.


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Old 09-23-2018, 04:38 AM   #16
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Re: Redirecting River Flow To Protect Bridge Approach


Engineer for sure. But Iíd say the only permanent fix would be lengthening the bridge and getting its supports to higher ground.
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Old 09-23-2018, 07:47 AM   #17
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Re: Redirecting River Flow To Protect Bridge Approach


Customer of mine was fined $25k for minor work to a steam on his property 15ac. Stream was 10ft wide and he installed large concrete blocks 2'x2'x6' to stop erosion on a bend.
Was spotted from a small plane, had to restore back to original condition
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Old 09-23-2018, 08:24 AM   #18
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Re: Redirecting River Flow To Protect Bridge Approach


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I was thinking 5-10 huge culvert pipes set in concrete, sloped on both sides, at the height of the bridge.

Lots of concrete......
But I think it would last.

Do you think redirect so not totally perpendicular to the flow?

Angled downstream a bit?


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Can you sketch that out and post it...draw it on the google photo.

My opinion....this is a massive project and if you don't get the alphabet agencies involved...you will end up wishing you did. You can't weed-wack weeds next to a body of water around here.
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Old 09-23-2018, 09:16 AM   #19
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Re: Redirecting River Flow To Protect Bridge Approach


I'd view culverts mainly as a way to raise the approach. You'd still want them to act as culverts. The centerlines would normally be installed parallel to the water flow, and standard installation slopes them down hill at a standard slope. It gives the best flow rate.

Just to get you calibrated, the cheapest 5' culvert ran $400-500 a linear foot installed. Just the culvert was $100 a linear foot, plus freight. I'm guessing prices have gone up....

With culverts, the discharge side has increased erosion potential, and once the diwnstream water comes up high enough, eddy currents will form that flow back toward your road base below the culvert.
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Old 09-23-2018, 09:42 AM   #20
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Re: Redirecting River Flow To Protect Bridge Approach


I'm guessing where he is it won't have to be permitted. Changing a bank or a channel is a no-no, but some vegetation can be removed within 75' of the bank. It's a road, you'd need to have runoff / erosion control during construction if you're digging or placing soil, and that's about it.

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