Fwd: RE: SOWACS: converting soil moisture tension to VWC

[Bruce -owner of sowacs <bruce@sowacs.com>]

Calder, Tim writes to the sowacs list:
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Dear Doug,  We have produced two curves for our extremely sandy
horticultural soil.  There are differences in moisture retention of these
two soils even though they appear the same.  I would guess that other soil
types would have the same variations.  For a Karrakatta sand the formula is 
1.8158+98.2927*(EXP(0.7270*centibars reading)) to produce percent moisture.
As you can see, the curve is very steep. 
 Best wishes Tim Calder 

> ----------
> From:         Bruce  -owner of sowacs[SMTP:bruce@sowacs.com]
> Reply To:     Bruce  -owner of sowacs
> Sent:         Saturday, 29 November 2003 5:21 PM
> To:   Bruce Metelerkamp
> Subject:      SOWACS: converting soil moisture tension to VWC
> 
> 
> Doug Kieffer writes to the sowacs list:
> ===8<==============
> I'm curious if anyone knows of any convenient way to do a rough conversion
> 
> from soil moisture tension to volumetric water content (VWC) if the
> general 
> soil type is known.
> 
> So far, I just photocopied a page from my "Intro to Soils" text from
> college 
> but
> 1. It only contains 3 soil types (sandy loam, loam, and clay loam) and
> 2. It's a bit cumbersome.
> 
> I would be interested in some good (high resolution) moisture release
> curves 
> or, even better, a simple calculator program where one could enter a 
> moisture tension and soil type and get the rough estimate of VWC.  Recent 
> web searches haven't led me to anything so far.
> 
> Thanks,
> Doug Kieffer
> dougkieffer@hotmail.com
> 
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