Modified stone

My son is working on an Eagle project, fixing up a township park. One of the things he will do is fill a couple of ruts with stone. These ruts had been filled with stone before, but some has washed out. (Parts of the park get a bit flooded from an adjacent stream, causing the ruts.)
Someone has suggested that he look into "modified" stone, without really knowing what it is. Poking around the web, modified stone seems to have stone dust and small pieces mixed in with it, mainly for use as a driveway base. Doesn't seem that this would help with a washout situation.
Any comments on a way to fill in these ruts?
Thanks.
Ken
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ruts like car ruts? or ruts like a washout? if the water/ river is eroding it, planting some type of grass or ect, will hold dirt down for a while, or, you can concrete over the trouble spot, some places dump old Christmas trees in rivers to help promote fish habitat and slow down erosion at the same time, If the water is eroding the banks though, you'll never win that fight. those caged rock "bricks" seem to work decently.
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Don't know the history of the ruts, but they're not on the bank. The cage is a good idea, maybe use a cage when he tops off the old stones with new stones.
Thanks.
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The only real long term solution is to raise the road-bed, and provide channels to divert water away from it. That's probably beyond the budget of the project, both in labor and in cost terms.
For small patches, the basic principle is: "Don't fight the water, help it out." You have to look at it, and decide where it's easier to move the water alongside the road, (and thus you make ditches), and where it's easier to help the water cross the road, in which case you need a crossing.
Depending on how much water, how seasonal it is, and how much effort and money is available, whether and what kind of vehical traffic there is, and what kind of park you're looking at, this crossing could be creating a seasonal ford, with flat rocks too big for the water to move in a saddle-shaped revetment, a culvert or a bunch of pipes laid under the roadway and burried under mixed rock and gravel, or a bridge.
A miminal solution is to look at what size rock or gravel washed out last time, and dump in something a big bigger.
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