Penman calculator for water use by grass
1.
Enter the daily (24 hour) AVERAGE solar radiation
watts/meter-sq
OR
time of year:
April-early May
late May-July
August
September
October
sky conditions:
Use solar value
Heavy clouds
Cloudy
Mostly cloudy
Partly cloudy
Clear
2.
air temperature
° F
3.
relative humidity
%
OR
dew point
° F
4.
wind speed
mph
OR
wind condition:
Use value
Calm
Light air
Light breeze
Breezy or windy
5.
Daily potential water use by grass
in.
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Washington State University
Tree Fruit Research and Extension Center
1100 N. Western Ave.
Wenatchee WA 98801
phone: 509-663-8181
Wenatchee WA, 31 May 1996
webmaster@tfrec.wsu.edu