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Posted on 8/16/16 at 12:57 pm to Tiger Ryno
It's not typical particularly in this case but in my neighborhood this is exactly what happened. There is a new development to the east side that blocked the flow of water to a creek on that side that had served as natural drainage since the early 60s. The neighborhood only flooded on the east side. There are several people planning on suing as a result.
Posted on 8/16/16 at 12:59 pm to RockAndRollDetective
This is what I'm talking about. It stands to reason if I build up my yard so high then my neighbor is going to get flooded when it rains too much.
Posted on 8/16/16 at 1:01 pm to Tiger Ryno
Not much if any at all. Theese rainfall amounts in short time is unprecedented and would flood nine out of ten areas of the country.
As far as Laffayette, it rained just about daily before, so the ground was pretty saturated already.
It happens. It happened a 100 yrs ago as well before all the development.
As far as Laffayette, it rained just about daily before, so the ground was pretty saturated already.
It happens. It happened a 100 yrs ago as well before all the development.
Posted on 8/16/16 at 1:04 pm to Tiger Ryno
quote:Rain.
What's the word in La?
Posted on 8/16/16 at 1:05 pm to tigeraddict
quote:
Those only flooded because of "flash" flooding may have an argument.
Definitely. If done incorrectly or neglected, development can exacerbate flash flooding problems. The slightest blockage in the system can be a major issue.
Posted on 8/16/16 at 1:07 pm to Ponchy Tiger
quote:
This was a act of God event
I thought that bastard said "no more floods".
Posted on 8/16/16 at 1:08 pm to Tiger Ryno
quote:
You are the 1st to say it's a huge problem...everyone else saying it's not. What is your evidence
I work in the field and regularly see flooding issues in areas that dont have a history of flooding.
A good example is a common one.. take two similar streams (width, depth, substrate, similar region)
Stream A in an urban area and average baseflow is 1.25 cubic ft/s, and during storm events peaks at 7 cubic ft/s.
Stream B in a rural area and average baseflow is 1.50 cubic ft/s, and during storm events peaks at 4 cubic ft/s.
Vegetation does a remarkable job of catching water..
Posted on 8/16/16 at 1:09 pm to bmy
Interesting. Are there specific developments you have in mind?
Posted on 8/16/16 at 1:14 pm to Tiger Ryno
quote:
Interesting. Are there specific developments you have in mind
USGS has done a few studies on the subject. It seems common sense enough.. water traveling along impervious surfaces reach streams more quickly than it should. Large amounts of water in a short amount of time = flooding. Increasing the amount of water (or decreasing the time it takes to reach a stream) = increased chance for flooding.
Posted on 8/16/16 at 1:14 pm to bmy
Seems like creating huge elevation changes that channel massive point sources of water into concentrated areas is a huge factor. Ag land that used to absorb water has been converted to res areas that funnel all the water to a tributary via storm water ponds.
Posted on 8/16/16 at 1:17 pm to Tiger Ryno
Posted on 8/16/16 at 1:25 pm to bmy
quote:
It's a huge problem. I do a lot of stormwater work.. end result is that unchecked development puts money in builders pockets short term and takes money out of taxpayers pockets long-term.
What's your opinion of drainage/overflow ponds? I'm seeing these in Florida adjacent to a lot of large new paved development like a school or a shopping center, sort of like an offset.
This post was edited on 8/16/16 at 1:26 pm
Posted on 8/16/16 at 1:25 pm to Tiger Ryno
I live in the Houston area and believe that the recent flooding was made worse by some developments (although I'm no expert in this area).
I have family in Youngsville (La.) and the flooding there was worse (by far) than I've ever seen. I recall other huge rain events including hurricanes and tropical storms (including Allison in '01 before it hit Houston) but do not know how the rainfall totals compare. I do know that Youngsville has had quite a bit of development over the past decade plus.
I have family in Youngsville (La.) and the flooding there was worse (by far) than I've ever seen. I recall other huge rain events including hurricanes and tropical storms (including Allison in '01 before it hit Houston) but do not know how the rainfall totals compare. I do know that Youngsville has had quite a bit of development over the past decade plus.
Posted on 8/16/16 at 1:26 pm to slackster
quote:
done incorrectly or neglected, development can exacerbate flash flooding problems.
There is one house in my division that got 1" or so of water and ruined all flooring and more. Yes thinking he's gonna sue the association and parish. One of the main culverts under a bridge that crosses the coulee, was half grown over by vines planted nearby. It's the half that's usually above waterline at all times.
They were catching lots of debris and I have very little doubt if not there, his home would not have flash flooded.
Posted on 8/16/16 at 1:32 pm to Tiger Ryno
The concrete and lack of drainage enhancements most definitely made it worse. Think of filling a bath tub with a fire hose while the plug is out. There was just too much coming in too quickly. Better drainage would've prolonged it, but made the severity much less. It was gonna happen to some extent either way
Eta: That applies to the lower LP/EBR/AP areas. Other areas flood regularly because of their location, topography, and a few other factors
quote:Yes. If you're gonna concrete everything, you need to figure out a way to slow the water since there isn't anything to do it anymore
What like trees and grass?
Eta: That applies to the lower LP/EBR/AP areas. Other areas flood regularly because of their location, topography, and a few other factors
This post was edited on 8/16/16 at 1:37 pm
Posted on 8/16/16 at 1:36 pm to Bmath
quote:
When you have phrases like "1,000 year rain event" it's pretty difficult to plan for that.
These seem to be occurring every 4-5 years. Weird.
Posted on 8/16/16 at 1:53 pm to Tiger Ryno
I believe a large probable is the government subsidized flood insurance, a lot of residential development would not have been built were it not for the availability of the insurance. When the private insurance industry will not underwrite the insurance because of the risk and the government has to provide it, you can be assured it is a really bad idea. I liken it to the rising cost of college, which has risen because of federally insured student loans that have enabled too many student to attend college that had no business going. Banks would have never taken the risk with the students on loans if they were not federally insured. Any time the government artificially interferes with the markets the outcome will be bad things happening over the long term
Posted on 8/16/16 at 1:53 pm to Tiger Ryno
Government corruption arising from flood zone designations are a big problem. Developers prize these designations. There is no telling what goes on when they make those flood maps.
We really should find a way to get rid of federal flood insurance then these people and banks would not be so careless in building homes in flood prone areas. Would probably have to buy all the property in the area and then auction it off stating it could not be insured with subsidized flood insurance.
We really should find a way to get rid of federal flood insurance then these people and banks would not be so careless in building homes in flood prone areas. Would probably have to buy all the property in the area and then auction it off stating it could not be insured with subsidized flood insurance.
Posted on 8/16/16 at 1:54 pm to Layabout
quote:
What's your opinion of drainage/overflow ponds? I'm seeing these in Florida adjacent to a lot of large new paved development like a school or a shopping center, sort of like an offset.
They are damn near mandatory for large developments
...they really help a tremendous amount if the development is designed properly at least. Most of them are sized for 100+ year storm events.
I've seen a lot of really effective lots using permeable concrete with a type of bioretention storage beneath it. That's probably the future.. it works, it saves space, and it looks nice. The downside is the expense but personally id rather put that on the developer and not on the consumer via taxes
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