I-40 bioretention NCDOT

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CarGuru > Driving > I-40 bioretention NCDOT 9 March 2005 14:30:24

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I-40 bioretention NCDOT
Milton 8 March 2005 07:40:54
	http://www.tfhrc.gov/focus/jan05/03.htm Hey, John Landsford, did you work on this section? We have been using some filter basins on local and state projects - our largest in construction now. Planning on using bio-swales and retention for a 90 acre site project coming up. How are they performing?
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John Lansford 8 March 2005 15:01:04 [ permanent link ]
	"Milton" <mfreelander@yahoo.com> wrote: http://www.tfhrc.gov/focus/jan05/03.htm> Hey, John Landsford, did you work on this section? Don't know a Mr. Landsford. I was, however, the lead design engineer for the I-26 project, but not the I-40 project. We have been using>some filter basins on local and state projects - our largest in>construction now. Planning on using bio-swales and retention for a 90>acre site project coming up.> How are they performing? Apparently the bioretention basin on I-40 is working well. There are some other ones I'm more familiar with along US 74 as you approach Fontana Lake just north of the Nantahala Gorge. They were installed along the road to neutralize acidic runoff from some material put in the embankment, and to remove heavy metals and oils from the runoff before they reached the lake. John Lansford, PE -- The unofficial I-26 Construction Webpage: http://users.vnet.net/lansford/a10/
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Larry Gross 9 March 2005 13:48:15 [ permanent link ]
	hmmm.. a dumb question... what are the differences between what traditionally is called storm water facilities and bio retention facilities? Does the storm water have a pool or reservoir and the bio retention not? how do they compare in cost?
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John Lansford 9 March 2005 14:30:24 [ permanent link ]
	"Larry Gross" <gross.larry@gmail.com> wrote: hmmm.. a dumb question...> what are the differences between what>traditionally is called storm water>facilities and bio retention facilities? A traditional storm water retention site is really just somewhere where the water can slow down and drop some of the silt and trash before it gets to a live stream. A lot of shopping centers build these now to control the runoff from their parking lots. There's one a few miles from my house I go by regularly that is about the size of an Olympic swimming pool, but over 20' deep. The ones we use, however, aren't nearly that big. Those are usually just a small hole in the ground with what's called a 'level spreader' built around it. That's an area around the pool that is the same elevation, so (in theory) the water doesn't concentrate but just seeps out of the pool in all directions. The bio retention facilities are manmade and/or natural wetlands that the runoff is discharged into before reaching a natural stream. My wife's firm she works for does these kinds of treatments, and are quite complicated. Does the storm water have a pool or>reservoir and the bio retention not? Well, there's standing water involved with both of them, but the retention basin usually only has a stilling basin. We put them in at the end of drainage ditches before they reach live streams to slow down the water and give it time to drop any impurities. They don't remove dissolved minerals or solids or fluids mixed in the water, though, only solids suspended in the water. how do they compare in cost? Stilling basins are fairly cheap, being basically just a hole in the ground with some stone and erosion control fabric around it. Bio retention facilities are big and expensive. I don't have prices for them but they aren't even comparable. John Lansford, PE -- The unofficial I-26 Construction Webpage: http://users.vnet.net/lansford/a10/
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CarGuru > Driving > I-40 bioretention NCDOT 9 March 2005 14:30:24

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I-40 bioretention NCDOT

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