Input File: C:\BCHProgs\Samples\NLayer\Soil1.nly
   Traverse: 1
       Date: August 11, 1998
Description: Near Substation in Okanangan Valley
  Equipment: Type DET-2 Four Terminal Tester

2-LAYER CURVE FIT
(Based on the method described in Appendix B of IEEE Guide 81 - 1983)
Upper layer resistivity estimated value:   420.0
                             Deep layer:   120.0
         Estimated depth up upper layer:     4.000
     Initial increment factor step size:     0.005000
   Maximum number of terms to calculate: 500

11 Measurement points
   1   1.0   0.10    67.000     423.4
   2   2.0   0.10    25.600     322.2
   3   4.0   0.10    10.270     258.2
   4   6.0   0.10     4.380     165.1
   5   8.0   0.10     2.870     144.3
   6  12.0   0.10     1.629     122.8
   7  16.0   0.10     1.225     123.2
   8  20.0   0.10     0.990     124.4
   9  24.0   0.10     0.831     125.3
  10  30.0   0.10     0.700     131.9
  11  36.0   0.10     0.584     132.1

Best fit obtained on iteration No. 435
Upper layer resistivity:     413.57
             Deep layer:     122.97
  Upper layer thickness:       2.16

Comparison below is based on these calculated values:

Spacing  Meas R     Calc R      Error
   m      ohm-m      ohm-m         %

    1.0   423.4    400.7       5.4
    2.0   322.2    348.0      -8.0
    4.0   258.2    231.4      10.4
    6.0   165.1    171.5      -3.8
    8.0   144.3    146.6      -1.6
   12.0   122.8    131.1      -6.8
   16.0   123.2    127.0      -3.2
   20.0   124.4    125.4      -0.8
   24.0   125.3    124.6       0.5
   30.0   131.9    124.0       6.0
   36.0   132.1    123.7       6.4

                  RMS Error    5.7%