Ag Alert Sept 8, 2021

CALIFORNIA IRRIGATION MANAGEMENT INFORMATION SYSTEM CIMIS REPORT | www.cimis.water.ca.gov

For the week August 26 - September 1, 2021 ETO (INCHES/WEEK)

YEAR

3.0

THIS YEAR

2.5

LAST YEAR AVERAGE YEAR

2.0

1.5

1.0

0.5

0.0

MACDOEL II (236)

BIGGS (244)

DAVIS (06)

MANTECA (70)

FRESNO (80)

SALINAS-SOUTH (214)

FIVE POINTS (2)

SHAFTER (5)

TEMECULA (62)

IMPERIAL (87)

THIS YEAR LAST YEAR AVG. YEAR % FROM AVG.

1.38 1.39 1.41 -2

1.47 1.20 1.38 6

1.80 1.75 1.74 4

1.90 1.80 1.56 22

1.53 1.39 1.47 5

1.60 1.40 1.58 2

1.79 1.65 1.62 10

1.30 1.06 1.19 10

1.15 1.14 1.39 -17

1.73 1.88 1.78 -3

W eekly reference evapotranspiration (ETo) is the rate of water use (evapotranspiration—the sum of soil evaporation and crop transpiration) for healthy pasture grass. Multiplying ETo by the appropriate “crop coefficient” gives estimates of the ET for other crops. For example, assume ETo on June 15 is 0.267 inches and the crop coefficient for corn on that day is 1.1. Multiplying ETo by the coefficient (0.26 inches x 1.1) results in a corn ET of 0.29 inches. This

information is useful in determining the amount and timing of irriga- tion water. Contact Richard Snyder, UC Davis, for information on coefficients, 530-752-4628. The 10 graphs provide weekly ETo rates for selected areas for average year, last year and this year. The ETo information is provided by the California Irrigation Management Information System (CIMIS) of the California Department of Water Resources.

For information contact the DWR district office or DWR state headquarters:

SACRAMENTO HEADQUARTERS: 916-651-9679 • 916-651-7218

NORTHERN REGION: Red Bluff 530-529-7301

NORTH CENTRAL REGION: West Sacramento 916-376-9630

SOUTH CENTRAL REGION:

SOUTHERN REGION:

Fresno 559-230-3334

Glendale 818-500-1645 x247 or x243

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20 Ag Alert September 8, 2021

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