Every 5 years a new road, or parking lot, or dike protecting a subdivision, or taller levee is built in the flood plain. Each of these restricts the river, raises it higher, slows it down.
What was smooth flat open fields in the river bottom here for thousands of acres the DNR took over and it has grown up into a thicket of scrub trees and shrubs a person couldn’t walk through. Flood waters 2-10 feet deep flow a lot slower through that!
We pave more and more land, water runs quickly to the small rivers and again piles higher.
We have changed that watershed a lot. We have forced the water to run slower, to rise higher.
You would need to factor that into your observations.
Then, weather seems to go on a more or less 30 year cycle. We are again in a rainy period, as has happened on a predictable schedule for centuries.
The climate does change. I farm 5 miles from the Minnesota river, it is carved into the ground 200+ feet deep. Because I also farm a few dozen miles from Swan Lake, which is the remnants of the glacial lakes of 10,000 years ago. The melting glaciers washed the Minnesota river valley out - we are a green version of the Grand Canyon here, the river valley is deep and wide. The ice was so deep it scraped 130 feet of clay off of the Mankato area and deposited it on my farm. As the ice melted my farm was part of the lake bottom, and a deep black topsoil formed from the aquatic life.
Yes, climate changes.
Yes, we have weather patterns that cycle through extremes.
Yes, we can change river flows with all the bulldozers and tar and concrete.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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