Riprap alternative - under a Bridge
Riprap alternative - under a Bridge
(OP)
Any suggestions to protect the banks under a bridge besides a hard-armor treatment measure? with little to no sunlight, soil bioengineering techniques won't really be possible. any other suggestions?





RE: Riprap alternative - under a Bridge
RE: Riprap alternative - under a Bridge
RE: Riprap alternative - under a Bridge
RE: Riprap alternative - under a Bridge
RE: Riprap alternative - under a Bridge
RE: Riprap alternative - under a Bridge
I've not seen many bridges without stone or other hard types of reinforcement to protect the river banks within and around the shadow zone of the bridge.
You will have to assess the acceptable risk if choosing an alternative type of erosion protection.
You could introduce plantings and other types of bioengineering outside the shadow zone to produce a greener look. Live stakes, shrubs and small caliber trees planted upstream and downstream of the bridge, in conjunction with a fescue seed mix native to your area would do a great job of visually hiding the hard armouring of the channel banks in the shadow zone. Not to mention provide additional stability to the channel banks upstream and downstream of the bridge.
RE: Riprap alternative - under a Bridge
RE: Riprap alternative - under a Bridge
RE: Riprap alternative - under a Bridge
http://www.cement.org/water/dams_sc.asp
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RE: Riprap alternative - under a Bridge
with good results. Some were labor intensive. I do not recall the cost but it did look better than concrete Rip Rap.
RE: Riprap alternative - under a Bridge
RE: Riprap alternative - under a Bridge
RE: Riprap alternative - under a Bridge
Intrusion Prepakt /marineconcrete.com
RE: Riprap alternative - under a Bridge
They can also be filled with organic soil and vegetated. While the vegetation may not take hold, it might be worthwhile to attempt as a gesture to the local agencies controlling the permitting.
RE: Riprap alternative - under a Bridge
We used the vegetated reno mattresses along the bank. The mattress were lined with erosion control blankets and then filled with a stone and topsoil combination (with seed). We had great success with this method and a year later you can not see the mattresses. At the toe, we used coir logs and live stakes. In addition to this, we pulled some large rocks from the creek and placed them along the toe of the slope to keep the main channel flow in the center of the stream. The large rocks matched the natural surroundings b/c they were natural from the creek and kept the flow in the center.
For your situation, if you will not have sunlight, you might want to consider ACB. I have had a lot of success with this material, plus, certian types have holes that will alow vegetation to grow through. Using large boulders at the toe might help give you a natural effect and minimize erosion by keeping the flow in the center of the channel.
Good luck!
RE: Riprap alternative - under a Bridge