Inyo County
Water Department

The Owens Valley Monitor 2002-2003

Owens Valley Precipitation
— Sally Manning, Vegetation Scientist

Inyo County Water Department has collected precipitation data at seven rain gauges in the Owens Valley since 1993. Precipitation totals for Water Department rain gauges appear in Table 1. For the 2002 water year (beginning October 1, 2001, and ending September 30, 2002), precipitation measured at the gauges averaged about one inch. This was the lowest average precipitation recorded during the period of record. Ninety percent of the 2002 precipitation fell between October 1 and April 15, prior to the growing season.


Table 1. Precipitation measured in ICWD rain gauges by water year (October 1 of the previous year through September 30 of the year noted).
Precipitation (inches)
Rain Gauge

1993

1994

1995

1996

1997

1998

1999

2000

2001

2002

RG-1, east of Fish Slough

5.94

3.40

7.60

4.51

4.66

6.09

1.82

1.32

2.26

0.86

RG-2, Laws Museum

6.29

3.62

7.80

4.55

4.91

7.34

2.50

1.73

3.27

1.28

RG-3, southeast of Bishop

7.21

4.34

8.87

4.29

6.85

9.98

2.39

2.93

4.63

1.24

RG-4, south of Big Pine

8.29

4.24

9.76

6.85

8.33

8.99

1.83

2.56

3.34

1.59

RG-5, Goose Lake

6.83

2.15

7.07

5.64

7.02

7.47

1.98

0.80

2.46

0.75

RG-6, near Blackrock

9.00

2.95

8.67

7.07

8.68

10.01

1.88

1.59

2.91

1.28

RG-7, west of Union Wash

5.00

1.61

4.88

2.14

4.35

5.06

1.61

1.54

3.91

0.51

Water Year AVG

6.94

3.19

7.81

5.01

6.40

7.85

2.00

1.78

3.25

1.07

Pre-Growing Season Avg (Oct 1 - Apr 15)

6.85

1.81

6.76

4.45

4.67

5.81

1.48

1.17

2.60

0.97

Percent in Winter

98.7

56.7

86.6

88.8

73.0

74.0

73.9

65.7

79.9

90.4


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