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Can we put the NOLA flooding in perspective?

Posted on 8/7/17 at 4:04 pm
Posted by LSUFanHouston
NOLA
Member since Jul 2009
41681 posts
Posted on 8/7/17 at 4:04 pm
8-9 inches in 3 hours. About 3 inches an hour non-stop.

May 1995 flooding had 18-22 inches in 6-7 hours. About 3 inches an hour, nonstop.

Rainfall rates of 3 inches an hour in the city are pretty common - happens a few times a year, really. However, it usually only lasts for 45-60 minutes, 3-4 inches of water pile up in the street, rain stops, it goes down, the end.

What made this somewhat more significant was the fact that it didn't let up for 3 hours. Again... this is pretty rare, but not unheard of.

But in any event... this was not a typical summer thunderstorm, nor was this a result of climate change. It was just a freaky meterological setup where a storm stopped moving that had a tremendous gulf inflow.

The 95 flood brought billions of dollars in drainage improvements to the city. I'm sure there are some things that can be done differently - I'm interested to see, for example, if closing the outflow flood walls and pumping over them is an option. That system is made for hurricanes, and pumping into the lake without closing the floodwall makes no sense... but maybe it's something that can be done.

I'm sure a bigger, better system can be designed... but who will pay for it?
Posted by rsbd
banks of the Mississippi
Member since Jan 2007
23471 posts
Posted on 8/7/17 at 4:07 pm to
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Posted by Placebeaux
Bobby Fischer Fan Club President
Member since Jun 2008
51852 posts
Posted on 8/7/17 at 4:07 pm to
I thought i saw reports that it was 5.4 over 4 hours.
Posted by Breesus
Unplug
Member since Jan 2010
69549 posts
Posted on 8/7/17 at 4:07 pm to
quote:

but who will pay for it?


Well Mitch found 3 million overnight for the statue removal and then bragged that he could raise 18-20 million privately in no time. Maybe he can do some good.

Oops, nvm he said he could only raise that if people didn't cry about infastructure improvements and he could use it on useless bullshite. And he only finds money to line his and his family's pockets or political careers not to do anything actually meaningful.

So I don't know who will pay for it.
This post was edited on 8/7/17 at 4:09 pm
Posted by GEAUXT
Member since Nov 2007
30619 posts
Posted on 8/7/17 at 4:08 pm to
quote:

I'm sure a bigger, better system can be designed... but who will pay for it?



Well, first we need to do some studies.
Posted by JS87
Member since Aug 2010
17754 posts
Posted on 8/7/17 at 4:08 pm to
Posted by slackster
Houston
Member since Mar 2009
91874 posts
Posted on 8/7/17 at 4:10 pm to
quote:

May 1995 flooding had 18-22 inches in 6-7 hours. About 3 inches an hour, nonstop.


No, no it didn't.
Posted by tigerinthebueche
Member since Oct 2010
38235 posts
Posted on 8/7/17 at 4:11 pm to
quote:

About 3 inches an hour non-stop.


well I got three inches of rain in one hour a few weeks ago. That was on top of the 4.25" of rain the day before. Which was on top of the 3.25" of rain I'd had on the previous Monday (two days prior). So I'd say heavy rains in short spans of time or not an anomaly in this state.
While money is the biggest concern, some routine maintenance would go a long way in helping alleviate the frustration alone, if not the actual problem.

But go ahead and tell me this is a one-off, a freak storm, a "once in 100 years event" or whatever.
Posted by teke184
Zachary, LA
Member since Jan 2007
105190 posts
Posted on 8/7/17 at 4:13 pm to
Funny how we keep having so many "once-in-a-hundred-years" storms every ten years or so.
Posted by Rouge
Floston Paradise
Member since Oct 2004
138855 posts
Posted on 8/7/17 at 4:17 pm to
quote:

May 1995 flooding had 18-22 inches in 6-7 hours. About 3 inches an hour, nonstop.


No, no it didn't.
if only we had an almanac that was kept by some farmers to consult on this event

The official National Weather Service report, issued in 1997, had...astounding rainfall totals:
27 1/2 inches in 40 hours at Necaise Crossing, Miss., the most in the region
Almost 25 inches in 40 hours near Abita Springs
12 1/4 inches of rain in five hours at Audubon Park in New Orleans
Almost 6 inches of rain in a single hour near Saucier, Miss.
This post was edited on 8/7/17 at 4:20 pm
Posted by tigerinthebueche
Member since Oct 2010
38235 posts
Posted on 8/7/17 at 4:17 pm to
Its not just the frequency of the heavy stationary rains. Its the extended periods of unsettled weather like we've had all summer. And the last. And the last before that.

No, I don't think its man-made global warming. I think its more development and less infrastructure repairs/maint. Our tax dollars at work. But they wonder why voters are unfriendly to new/higher taxes.
Posted by Lugnut
Wesson
Member since Nov 2016
1523 posts
Posted on 8/7/17 at 4:19 pm to
New Orleans needs more taxes!!!
Posted by EZE Tiger Fan
Member since Jul 2004
55457 posts
Posted on 8/7/17 at 4:20 pm to
quote:

I'm sure a bigger, better system can be designed... but who will pay for it?


It won't be the majority of the people who vote for fine leadership like they are getting from Mitch and the crew. It will be the "morons" that he and his ilk LOVE to chastise, while holding their hand out.
Posted by Hickok
Htown
Member since Jan 2013
2987 posts
Posted on 8/7/17 at 4:21 pm to
quote:

What made this somewhat more significant was
...Climate Change, the Mayor and NOSWB said so themselves so who are we to question them.
Posted by slackster
Houston
Member since Mar 2009
91874 posts
Posted on 8/7/17 at 4:21 pm to
quote:

Funny how we keep having so many "once-in-a-hundred-years" storms every ten years or so.


It is a common misconception caused by the title. A 100-year rainfall pattern simply means a 1% chance of occurring on an annual basis.

The chance of having 2 or more 100-year events in a 15 year time frame essentially equal to the chance of having 1 event in any given year.
Posted by LSUTANGERINE
Baton Rouge and Northshore LA
Member since Sep 2006
38468 posts
Posted on 8/7/17 at 4:28 pm to
May 3rd from the late 70s says hello
Posted by slackster
Houston
Member since Mar 2009
91874 posts
Posted on 8/7/17 at 4:31 pm to
quote:

12 1/4 inches of rain in five hours at Audubon Park in New Orleans


This is absolutely insane, and it's still 6 inches less than the OP would have you believe.
Posted by StripedSaint
Member since Jun 2011
2386 posts
Posted on 8/7/17 at 4:38 pm to
I was out in the weather all day. The amount of rain wasn't that bad. This 100-year storm story is bullshite. The pumps were not on and the drains were clogged.
Posted by DustyDinkleman
Here
Member since Feb 2012
20381 posts
Posted on 8/7/17 at 4:39 pm to
The only perspective is that New Orleans sits in a bowl that's below sea level...it's going to flood every time it rains.


End of story
Posted by tgrbaitn08
Member since Dec 2007
148031 posts
Posted on 8/7/17 at 4:42 pm to
quote:

The only perspective is that New Orleans sits in a bowl that's below sea level...it's going to flood every time it rains.


End of story



I live in the lowest part of the city, the bottom of the bowl and the water didnt get over the curb on my street.

You sound like an idiot when you have no idea what you're talking about. The whole city is not below sea level

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