Re: TDR Equation Request

[Hanson, P.J. et al]

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We have been doing something just like that for vertically installed 
rods at 0-35 and 0-70 cm.


Our calculations are as follows:

Because the integrated measurement of the percent soil water in the 0 
0.7 m depth interval (SW70) contains all of the soil water measured 
by the 0 0.35 m waveguides (SW35), the percent soil water content in 
the 0.35-0.7 m portion of the profile (SW3570) can be estimated by 
subtraction from the following equation:

SW3570 = [(SW70 * 0.7 m3)- (SW35 * 0.35 m3)] / 0.35m3 		(1)

where 0.7 and 0.35  m3 are the total and partial volume of a 
hypothetical soil sample 1 x 1 x (0.7 or 0.35) m.


More detail can be found in our technical description of our experiment:

Hanson, P.J., D.E. Todd, M.A. Huston, J.D. J^û0