Re: suggestions to agitate stream flow?

Robert Kim wrote:
> 
> Hi, group.  I hope this is the correct newsgroup in which to post this.
> We have some very slow-moving streams in a heavily wooded area (water
> velocity maybe 1 mph) contaminated with VOCs (volatile organic compounds).
> These VOCs can be stripped out of the water if agitation is introduced
> such as by increase stream flow velocity, etc.  But the stream water flow,
> being on a very slight grade, probably won't get too much faster by just
> throwing obstacle like rocks in it.
> 
> Can anyone suggest an inexpensive way to agitate the water to strip out
> these VOCs?  We have even considered low-powered air bubble systems but
> would prefer to use some passive, natural way of increasing water
> agitation.
> 
> TIA,
> 
> Bob

Depending on the use of the site, a small pump driven fountain or 
fake waterfall might be an option.  A stack of large rocks or even
broken concrete with the water flowing down over the surface.