[Odonata-l] drought areas in US

[Steve Collins]

Dave,

You would find that many rivers and streams are more flashy now, with 
contributing watersheds composed of more impervious surface and other 
landuse changes condusive to increased runoff.  Many USGS data sets 
indicate this, despite the advent of stormwater management.  I don't 
know about the rainfall intensity itself, however.

Cheers,
Steve Collins
Towson, MD

Dave McShaffrey wrote:

> Drought is a problem for sure, but I think there is another subtler 
> problem in the works for the odonates.  I can't prove it, but it seems 
> to me that when it rains now it really rains hard, and these spates 
> are causing rivers to rise and fall quickly.  A river that rises 
> quickly has the capability to wipe out a whole generation of emerging 
> odonates along its banks.  I think for some of our river species the 
> unpredictability of river levels may be just as important as drought.
>
>  
>
> I suppose if one had time one could use the USGS sites like this one:
>
>  
>
> http://waterdata.usgs.gov/oh/nwis/dv?cb_00065=on&cb_00060=on&begin_date=1998-10-01&end_date=2007-07-03&site_no=03115400&referred_module=sw 
> <http://waterdata.usgs.gov/oh/nwis/dv?cb_00065=on&cb_00060=on&begin_date=1998-10-01&end_date=2007-07-03&site_no=03115400&referred_module=sw>
>
>  
>
> to see if things have really changes over time.  Of course, this 
> particular site only has height data going back to 1998.  Still, a 
> random sampling of sites with a longer period of record might turn 
> something up.  I small a MS thesis in here somewhere...
>
>  
>
> Dave
>
>  
>
> Dave McShaffrey
>
> Marietta College
>
> (740) 376-4743
>
> www.marietta.edu/~mcshaffd
>

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