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Scientific Investigations Report 2008–5059

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2008–5059

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Table 1. Semivariogram and kriging parameters used for interpolation of depth to water and water-table elevation.

[ft, foot; ft2, square foot; mi, mile]

Semivariogram parameters
Model Nugget
(ft2)		 Scale
(ft2)		 Sill
(ft2)

Length (range)
(ft)

 Polynomial
drift
Depth to water Exponential 0 3,930 3,930 13,220 None
Water-table elevation Spherical 0 16,880 16,880 28,510 Quadratic

Kriging parameters
Kriging
type		 XSpacing
(ft)		 YSpacing
(ft)		 Number of
data points		 Number of
search sectors		 Maximum number of
data points used in
each sector		 Maximum number of
data points used in
all sectors		 Minimum number of
data points used in
all sectors		 Search radius
(mi)
Depth to water Block 250 250 4,605 4 16 64 8 39
Water-table elevation Block 250 250 4,605 4 16 64 8 39

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