Sunday, August 28, 2022

Rez Update: Intakes Crested

 The Pearl River Valley Water Supply District issued the following statement. 


The Reservoir inflows have crested. However, there is still a lot of water that must flow downstream. 


Following this morning’s conference call with the National Weather Service (NWS), the Pearl River Valley Water Supply District will hold the current discharge at the Barnett Reservoir at 60,000 cubic feet per second (CFS). This discharge will be held for at least 24 hours in order to reduce the level of the lake. 


The lake currently stands at 298.63 feet above mean sea level. 


The NWS predicts the river level in Jackson at Highway 80 to crest at 35.5 feet on Monday morning. Water will be in several streets in Jackson and could begin approaching some homes and businesses. 


Residents in low-lying areas should remain vigilant and stay prepared. This high water event is predicted to last 7 – 10 days. 

13 comments:

Anonymous said...

35.5 vs. 36.0 - that six inches doesn't seem like much, but it could prevent dozens of homes from being flooded.

Between Hinds and Madison Counties there are 635 customers without power, mostly Entergy pre-emptive shut-offs.

Anonymous said...

Many people are being impacted but it looks like a widespread flooding event will again be dodged. Now 43 years removed from 1979 we have to ask what has been done to mitigate the Pearl flooding in the metro? The answer is nothing.

The lakes may or may not be the solution but one thing is certain, the people against the lakes don't have a plan and should be chased down, tarred and feathered when, if, the next '79-like flooding event occurs.

Anonymous said...

They need to go ahead and keep the spillway open to max flow.

Anonymous said...

Somebody should come up with a mitigation plan that includes lakes.

Anonymous said...

They said the flow into the rez has crested (until the next significant rain), but they didn't say what the flowrate into the rez is. The 60,000 cfs flowing out might be very little more, or even less, than what's coming in. This is half a story.

Anonymous said...

They should buy up the houses that flood every two years and make it a greenway.

Anonymous said...

@1:34 Doesn't "crested" in this term kind of indicate that it's not rising anymore, therefore the inflow is being managed properly by the outflow at this point? I don't think that word means what you think it does.

Anonymous said...

There is a simple, elegant solution to Jackson’s flooding problem, the Shoccoe Dry Dam proposed years ago by the Corps of Engineers. It’s basically a large detention pond upstream of Jackson that will hold water back, letting it pass slowly enough that the Rez and Pearl River in Jackson are not overwhelmed. It’s not glamorous like the twin lakes or one lake proposals, but much more effective.

Anonymous said...

1:34 - You should know better than to question any update posted on this blog. You run the risk of being told you're stupid and need to check the blog archives.

And, no, 3:14 - 'Crested' is guesswork at best and a moving target at worst. You didn't know that, did you?

Anonymous said...

@3:14, this is 1:34.

Not exactly. The flood wave into the rez will crest at some point no matter what they're doing with the outflow, and the outflow does not control the crest of the inflow. The inflow rate before, at, or after the crest could be far above or far below the outflow. So, the flood wave could be well below its crest, but could still far exceed the outflow from the rez. In an extreme case a flood wave could remain that way for weeks after the crest, causing the rez to overflow well after the crest has arrived and presumably passed through. Suggested reading: Hydrology for Engineers (McGraw-Hill Series in Water Resources and Environmental Engineering), by Ray K. Linsley, Max Adam Kohler, Joseph L. H. Paulhus. My edition is about 40 years old.

Anonymous said...

Crested is hydrology speak for "reached its peak."

Anonymous said...

Let's remember folks, and I mean this in the kindest way, this isn't the City of Jackson running this show. These guys know what they're doing. Perfect, no, but pretty darn good.

Anonymous said...

12:35. John McGowan did that decades ago.


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