How do they measure the flow?

math

I'd be interested in knowing myself, but they probably measure the velocity of the water in the river and multiply by the cross sectional area of the water depth.

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I'd be interested in knowing myself, but they probably measure the velocity of the water in the river and multiply by the cross sectional area of the water depth.

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Would velocity be constant when the river is spread out so wide?

Probably not, and cross section changes so parameter updates are often added.
If you have the bandwidth this may be an interesting site to bookmark:

LINK

Or this publication that is now on the web.
LINK /

Thanks.

They may add new-fangled instrumentation (lidar and ultrasonics) to improve measurements, but the old science still works. Flow is Flow.
Predictive math models are "reverse engineered" into historical data not the other way around. Not yet anyway.

and we be adding more of them historical data points right now

Do you guys know the potential impact of they opening Morganza to 25% capacity rather than the 50% the Inundation maps were based upon? The corp said yesterday during the press conference that they would only have to go to 25% based on the NWS projections for the river. Does this mean half the water heights down the Atchafalaya Basin?

The Project flood shows 1.5 million cfs down the basin. I believe this is the max design of the controls. The fuse plug levee isn't expected to flow (250,000 cfs), Morganza at 25% (150,000 csf) and the ORCS at 620,000 EDIT: and about 35,000 cfs from the Red River would give about 800,000 cfs total down the AR and basin.

Hope opening of additional bays is delayed to reduce basin flow rates.

Q=VA

There's really no standard, its just based on how big of a bitch she's being.

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What exactly to they use to measure the flow of the river?

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A bunch of folks with coke bottle glasses and tinfoil hats. And thank god for em.