�From:�	Bruce Metelerkamp (BRUCE)
�To:�		SOWACS@aqua.ccwr.ac.za
�Date:�	Wednesday, May 15, 1996  8:54 am
�Subject:�	Gravel bar water flow sensors?

Message forwarded to SoWaCS on behalf of Victoria Grant.

(Some of the South African International lines were down last
week, so please repost until you have sucess).
Things seem to have settled down now.

--------------------------------------------

I am interested in measuring interstitial water pressure, water
content, and water flow in gravel bars in and adjacent to gravel
bed streams.  This effort is in conjunction with predicting
vegetation growth patterns on these bars, which are subject to
annual flooding, accretion, and degradation.

If you have any leads/references on techniques, methodologies, or
equipment, I would very much appreciate a response.

Thank you,

Victoria Grant
National Park Service
Van Buren, MO 63965  U.S.A.

Victoria_Grant@nps.gov
===============================================
[Bruce Metelerkamp comments] It seems to me that this work deals
with water in the high water potential (near 0 kPa) area, and as
such, is not driven by water potential gradients, but by gravity
and resistance to flow paths. These are difficult to measure with
the type of soil water sensors normally used for relatively
static soil water measurement? Are there others that can?

Please can you expand a little on the terms "interstitial", 
"accretion" and "degradation" in the context of gravel beds?

Thanks
[End comment]