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VH400 Piecewise CurveMost curves can be approximated with linear segments of the form: y= m*xb, where m is the slope of the line The VH400's Voltage to VWC curve can be approximated with 4 segents of the form: VWC= m*Vb where V is voltage. m= (VWC2  VWC1)/(V2V1)where V1 and V2 are voltages recorded at the respective VWC levels of VWC1 and VWC2. After m is determined, the yaxis intercept coefficient b can be found by inserting one of the end points into the equation: b= m*vVWC
Most soils have a holding capacity of less that 50%, so the curves stop at 2.2V which represents 50% VWC. Above 50% you can use an approximation as follows:



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