Posted by paul on December 28, 2019 at 22:11:42 from (66.60.223.229):
In Reply to: Fighting nature. posted by flying belgian on December 28, 2019 at 09:05:35:
I remember Mankato before the dikes went in. Pretty much returned North Mankato to the wetland status in the 1960s floods, boy that was tough on those folk.
They built the dikes after the 1960s flooding, and then put in higher tops after the 1990s flooding worried them.
You all understand what a dike does? It is basically a dam, so the water in the river can no longer spread out sideways. Instead, the water needs to pile up higher.
The same gallons need to flow through, with or without the dikes.
If the river would normally have raised 5 feet and spread out to a mile across in a wide slow run. But now you limit it to 1/4 mile across, it now has to rise 15 feet, or more likely will rise 5-10 feet and flow faster.
So, the city itself created higher water that is faster moving. Upstream of the diking the water piles higher; downstream the water is higher and faster flowing.
Which is why the shore is ‘suddenly’ eroding into their well now.
It has nothing at all to do with tile. Not a thing.
Field tile moves water at different times. In these solid our grounddoesnt perc well. So our prairie potholes used to fill up in heavy rain and then flood over the surface in massive floods.
With tile, we spend 1-3 months draining out our soils, slowly, to three feet deep. When it rains heavy, that drier soil acts like a sponge and holds the rain. To slowly come out the tile over the next few weeks or months again.
We have far less over land heavy floods with tile than we used to have.
Blaming tile for the effects of the dole around Mankato is typical, but foolish.
Tile has nothing to do with it.
This pamphlet has a nice summery of the 65 flood in Mankato. They rebuilt the bridge higher, moved the roads and built very tall dikes since.
The river is now trapped and must flow higher, and with the depth and smooth dike walls flows faster.
Doesn’t take much thought as to why the river is scouring more shoreline!
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