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<blockquote data-quote="Allen" data-source="post: 220477" data-attributes="member: 389">Without looking, I would guess the equation for the stage-rating curve, which generally goes in the form of &quot;y = mx + b&quot; has been shifted by updating the &quot;b&quot; due to the measurement. This is common, but until someone tells me the physical process by which the river is now losing a couple thousand cfs, I'd suggest the &quot;drop&quot; is not real. Outside of washing machines and dryers, things don't just disappear in real life for no reason.&nbsp; The same organization that is measuring the flow at Bismarck is also measuring the flow immediately below Garrison Dam.&nbsp; Where they maintain there's 60,000 cfs coming out of the dam.&nbsp; In the initial run up to a new high water mark, there is discharge water lost that is lost to what's called bank storage (water going into the bank and near shore pore space).&nbsp; This doesn't seem to fit that kind of water loss as it's too much and is usually only really observable for the first few days before a new equilibrium with the flood plain aquifer is reached. I would hazard a guess the true cfs in Bismarck is right around 61,xxx.</blockquote>

[QUOTE="Allen, post: 220477, member: 389"] Without looking, I would guess the equation for the stage-rating curve, which generally goes in the form of "y = mx + b" has been shifted by updating the "b" due to the measurement. This is common, but until someone tells me the physical process by which the river is now losing a couple thousand cfs, I'd suggest the "drop" is not real. Outside of washing machines and dryers, things don't just disappear in real life for no reason. The same organization that is measuring the flow at Bismarck is also measuring the flow immediately below Garrison Dam. Where they maintain there's 60,000 cfs coming out of the dam. In the initial run up to a new high water mark, there is discharge water lost that is lost to what's called bank storage (water going into the bank and near shore pore space). This doesn't seem to fit that kind of water loss as it's too much and is usually only really observable for the first few days before a new equilibrium with the flood plain aquifer is reached. I would hazard a guess the true cfs in Bismarck is right around 61,xxx. [/QUOTE]

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