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CONTENTS
Abstract
Introduction
Water-Level Measurements
Sources of Water-Level Fluctuations
Analysis of Water Levels
Summary
References Cited
Appendix 1
Appendix 2
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Table 5. Analysis of
water-level trends, using the Kendall-Theil robust line method, in
selected wells on Pahute Mesa and vicinity, Nevada Test Site
Level of significance (p):
Probability that water-level changes are due to chance rather than a
trend; p-values less than 0.05 are considered statistically
significant, p-values less than 0.001 are highly significant; <,
less than.
Slope: Estimate of slope in the trend line using the Kendall-Theil
robust line method; slope not estimated if trend is not statistically
significant or slope of trend appears nonlinear.
Hydrologically significant trend: Considered hydrologically
significant if the level of significance is less than 0.05 and change
in slope is more than 1 foot over the period of record; up, water
level rising; down, water level declining.
| Well
name |
Period
of
record analyzed |
Level
of
significance
(p) |
Slope
(feet per year) |
Hydrologically
significant trend |
| UE-18r |
1986-98 |
<0.001 |
+ 0.12 |
up |
| UE-18t |
1978-98 |
< .001 |
+ .04 |
none |
| WW-8 |
1971-95 |
.27 |
not estimated |
none |
| U-19az |
1989-90 |
.063 |
not estimated |
none |
| U-19bh |
1992-98 |
< .001 |
+1.2 |
up |
| |
|
|
|
|
| U-19bj |
1993-98 |
< .001 |
-.43 |
down |
| U-19bk |
1992-98 |
.069 |
not estimated |
none |
| U-19v PS 1D |
1973-98 |
< .001 |
not estimated |
up |
| UE-19c WW |
1995-98 |
.012 |
+.19 |
none |
| UE-19h |
1992-98 |
.71 |
not estimated |
none |
| |
|
|
|
|
| ER-20-1 |
1995-98 |
.59 |
not estimated |
none |
| ER-20-2-1 |
1996-98 |
< .001 |
-.37 |
none |
| PM-1 |
all data |
| early data |
| recent data |
|
1988-98 |
< .001 |
not estimated |
up |
| 1988-94 |
< .001 |
+1.2 |
up |
| 1993-98 |
.002 |
-.38 |
down |
| |
|
|
|
|
| PM-2 |
periodic data |
| continuous data |
|
1983-98 |
< .001 |
-.05 |
none |
| 1996-98 |
< .001 |
not estimated |
none |
| U-20 WW |
1985-98 |
.86 |
not estimated |
none |
| U-20ax |
1988-92 |
.23 |
not estimated |
none |
| U-20be |
1990-91 |
< .001 |
-1.9 |
down |
| |
|
|
|
|
| U-20bf |
1989-90 |
< .001 |
-4.3 |
down |
| U-20bg |
1991-98 |
< .001 |
-1.1 |
down |
| U-20n PS 1DD-H |
1985-98 |
< .001 |
-1.2 |
down |
| UE-20bh 1 |
1991-98 |
< .001 |
-.94 |
down |
| UE-20n 1 |
1987-98 |
< .001 |
-1.2 |
down |
| |
|
|
|
|
| PM-3 |
1988-91 |
.23 |
not estimated |
none |
| PM-3-1 |
1992-98 |
< .001 |
+.35 |
up |
| PM-3-2 |
1992-98 |
< .001 |
+.33 |
up |
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