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I started to add this to Jeff's thread about contacting state officials about getting the "Boom the Bridges" program approved. I applaud Jeff's work and agree that we all need to become very proactive. However, I have been concerned that the booms that we have seen used so far are too small to be effective. A little reseach on Google confirmed my fears. The problem of a boom system for open water and faster currents has been studied extensively.

Please take a look at the following link. A diversion boom system in open water with faster currents requires a more serious boom system. We need something much better than the dinky booms that we have seen so far. The system that we need requires taller booms and a much better system. We need a heavy duty, serious containment system - not just a token system.

<a href="http://www.dec.state.ak.us/SPAR/perp/star/12diversion.pdf"><a href="http://www.dec.state.ak.us/SPAR/perp/star/12diversion.pdf"><a href="http://www.dec.state.ak.us/SPAR/perp/star/12diversion.pdf"><a href="http://www.dec.state.ak.us/SPAR/perp/star/12diversion.pdf">http://www.dec.state.ak.us/SPAR/perp/star/12diversion.pdf</a></a></a></a>

This is a "pay me now or pay me later" problem. We can get a heavy duty system now which will really contain some oil (and will cost some serious money) or we can try heroically to clean up later.This probably will cost even more money, but more importantly our fisheries will already have been irreparably damaged.

PS. Sorry about the poor grammar in the title, but our forum does not allow me to edit the topic and correct it.
 

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I don't think you will find an effective boom for fast currents. Think about it for a second make a boom deeper and you are creating more area for the current to effect it. Add a little wind and the oil will go over the top anyway. For fast current you will need a pickup system that is towed and has a recovery system in the middle. of the towed booms.
 

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Bigger noodle, deeper curtain with large round holes in the curtain...

Then put, basically, drogue chutes attached to the holes on the back side, buoyant tubing from the small end of the funnel on each chute will be several thousand feet long. These will be attached to a "collector manifold" on a following vessel equipped with a suction pump forcing the slurry through a basic oil separator... Drag the thing awhile to build up a good thickness of crude. The boom would be much longer and towed by 2 vessels or one larger one with much wider outrigger booms... like 1-3 hundred feet long. Costly? Likely VERY! But Making money often costs money... Give us rednecks a problem and we usually come close to a good solution far quicker than the high browed scholars...

Might be a tad better than just corralling it.
Brent
 

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<span id=ctl00_ctlContentPlaceHolder_ctl00_ctlTopic_ctlPanelBar_ctlTopicsRepeater_ctl05_lblFullMessage>Repost from another thread. That link you have has a lot of similar info. I just wanted to make sure thatwhoever is planning the boomssees these links too, so they have as much info as possible.

This paper has some good guidelines for how to combat spills in fast currents, like at our passes and some bridges. <a href="http://www.epa.gov/OEM/docs/oil/fss/fss02/hansenpaper.pdf"><a href="http://www.epa.gov/OEM/docs/oil/fss/fss02/hansenpaper.pdf"><a href="http://www.epa.gov/OEM/docs/oil/fss/fss02/hansenpaper.pdf">http://www.epa.gov/OEM/docs/oil/fss/fss02/hansenpaper.pdf</a></a></a> They really need to look at this, or booming won't stop the oil. This is another good site I found. <a href="http://www.fws.gov/contaminants/FWS_OSCP_05/fwscontingencyappendices/N-Manuals-Response-Assessment/Spills_FastCurrent.pdf"><a href="http://www.fws.gov/contaminants/FWS_OSCP_05/fwscontingencyappendices/N-Manuals-Response-Assessment/Spills_FastCurrent.pdf">http://www.fws.gov/contaminants/FWS_OSCP_05/fwscontingencyappendices/N-Manuals-Response-Assessment/Spills_FastCurrent.pdf</a></a>
 

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Sealark called it right. "Entrainment" is when the current hitting an obstruction causes the water to be sucked downwards, and starts at just under 1 knot of current.

They make boom up to over 6' tall. but more surface area will not stop the water/oil from being sucked downwards. There will be x-amount of downward force from entrainment on a boom with 12" draft, and multiplied by x-amount of downward force on a 60" draft boom.

The boom has to be at an angel to the current to avoid entrainment, the stronger the current, the greater the angle.

Multiple "lines" of boom need to be laid in cases like that, at angles. 1st starting from the shore out to a certain point in the water, then another farther down current overlapping the area of the first, and extending even a little farther out in the water, and so on.

Containment boom is verydifficult to use in currents, and a collection system is really the most effective, as I think it was hotdogs talking about. And even the above system really needs a collection system at thefarthestdown current area.
 
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