With each one of these floods [and this is about the 10th 100 year flood that I can remember in the past 30 years] the topsoil washes into the river and fills the bottom and makes the river more shallow and makes the next 100 year flood that much easier.
Oh, and let's not forget that we pave over land like it was a Order from God and lessen the amount of absorbency in the ground. We build McVillage after McVillage creating suburban sprawl that reroutes the natural water flow and causes all manner of unintended consequence. But hey, we got shopping centers and Walmarts and McDonalds and tanning salons within 5 minutes of EVERYONE!!!
And then there are those changing weather patterns.
very true as of old construction but not so since the 90s. but of course nature is altered and that's the way it is. the difference in runoff water from undeveloped land and what it will be after paving has to be detained on site by code. it definitely is done today with about everything. however we do lose ground water refill when everything is either paved or drained off.
I thought the effect is the opposite. The levees prevent flooding so all the sediment
which would have been spread across the flood plain ends up at the bottom of the
Where do you think the sediment comes from? It would be the topsoil and sand and rocks and roots and all that. The levees are suppose to channel the water away from cities and SOME farm lands but don't extend throughout the entire tributary system of big water systems.
And apparently they don't hold the water back so well either. Wonder if the same Corps of Engineers kiddies who dealt with the Levee system in NOLA also built, managed and inspected the upstream system? I am not seeing much quality in their work.
not all and in fact most levees weren't constructed by USACE nor similar state agencies. most levees were constructed by farmers or nearby inhabitants. only now are these agencies either fixing or updating some of these "levees."
NOLA is such a waste, the levees there are a perpetual money sinking wall. it will never be done nor will it really ever keep anyone safe and dry. just my dime on that.
Not to mention the kegger which he appears to have almost fully consumed. Something tells me this is not a desperate act of emergency but simply status quo in this fellers' daily routine.
I think he's que'ing locusts.
lol. didn't notice the kegger first time around. oh man.. this guy seems v. natural and comfy.. yeah, it's just a routine. i wander if clk does his catfish in this fashion
You got it backwards.
Rain washes over the top soil carrying some into the river.
Flooding has the opposite effect of dumping soil on the plains.
um, I have been in floods. I don't have it backwards. Depending on where you are in the flow you might get soil dumped on your land but you are more likely, during the heavy rains to have it wash away and dump into the river. It is why they continuously try and dredge the river systems, never quick enough.
I have seen 2000 acres with ALL the topsoil removed by fast moving flood water. The underlying dirt grows nothing.
Here ya go.
Flooding is a natural part of the life of a river. Before humans intervened, the Mississippi River flooded every year. In fact, floods and the sediments they deliver are largely responsible for the richness of the soil found in floodplains
Teachers' Domain: Flood: Farming and Erosion
i wanted to chime in after the first post but looks like milf hereis on it although you both are right. it kind of works both ways. washes and then floods redeposit. that's how it works. mcbear, the thing is that your soil was stripped by the floods but it can't get replenished because of the levees. all your land ever experiences is the super floods. without the wall your land would get smaller floods all the time and thus the soil particles would be better able to be deposited.
btw. are you sure your soil is stripped or is it actually so covered with sediments that nothing will grow for now?
someone said something about the mississippi and all these deposits: well, with the levee system all the stuff actually doesn't necessarily all end up on the bottom of the river but definitely in places that would be true. the further south, the worse which bring us all back to NOLA and the problems only compound. besides look into some sat pictures of the mouth of the mighty river and what it is doing to the gulf.
oh and between here and LOU it's a mess. i live up high so no issues here. the basement took on a bit but it was all gone a day later.