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Why does nobody talk about how much sediment a river can carry in one flood event?
I was looking up specs for a job on the Mississippi near Baton Rouge (just out of curiosity) and stumbled on a USGS report saying a single spring flood can move over 200 million tons of sediment downriver. That blew my mind because we only ever worry about our cutterheads getting clogged or the pump losing vacuum from sand buildup. Has anyone else ever factored major flood events into their dredge planning or is it just something you roll with?
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david_rivera45mo ago
Factor the river's peak flow into your pump calculations or you'll lose your vacuum.
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paul3465mo ago
My buddy Tom lost a whole pump setup last spring on the American River because he didn't check the historical peak flow data. He just looked at the average flow for that time of year and figured he was fine. Then a storm way upstream dumped three inches of rain in six hours, and the river came up fast. By the time he got there to check on it, the pump was underwater and the vacuum seal was gone. The whole intake line got clogged with debris and silt. He spent two days digging it out and fixing the motor. So yeah, I learned from his mistake. You gotta look at the 10-year high water mark, not just the average.
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gray64mo ago
I used to just look at average flows and call it good, but after hearing stories like this, I completely changed my approach. @david_rivera4 has it right, peak flow is the real number you need to plan around. Now I always go back at least five years on the gauge data before I set anything near the bank.
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