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Water and potential evapotranspiration at irrigated and rangeland sites in southern Idaho. Partial research technical completion report Item Info

The environment of a weather station site is important in estimating consumptive use by irrigated crops. Consumptive use may be over-estimated when air temperature and vapor pressure data from a weather station with an arid local environment are used without modification. To document the effect of weather station aridity on consumptive use estimates, three sites in irrigated areas and two sites in nonirrigated, arid rangeland in southern Idaho were instrumented with weather stations during 1981. Air temperatures were higher and vapor pressures were lower at the arid sites. Use of air temperatures and dewpoint estimates from arid sites caused an overestimation of ETr by 17 percent (210 mm) over the irrigation season. Results indicate the importance of weather site evaluation and adjustment of siting effects and weather before consumptive use estimates are made. A procedure is outlined for adjusting historical temperature data to reflect an irrigated condition.

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Title:
Water and potential evapotranspiration at irrigated and rangeland sites in southern Idaho. Partial research technical completion report
Authors:
Allen, R. G.
Date Created (ISO Standard):
1983-07
Description:
The environment of a weather station site is important in estimating consumptive use by irrigated crops. Consumptive use may be over-estimated when air temperature and vapor pressure data from a weather station with an arid local environment are used without modification. To document the effect of weather station aridity on consumptive use estimates, three sites in irrigated areas and two sites in nonirrigated, arid rangeland in southern Idaho were instrumented with weather stations during 1981. Air temperatures were higher and vapor pressures were lower at the arid sites. Use of air temperatures and dewpoint estimates from arid sites caused an overestimation of ETr by 17 percent (210 mm) over the irrigation season. Results indicate the importance of weather site evaluation and adjustment of siting effects and weather before consumptive use estimates are made. A procedure is outlined for adjusting historical temperature data to reflect an irrigated condition.
Subjects:
Weather data collections Air temperature Vapor pressure Consumptive use Crops
Location:
Southern Idaho
Collection:
IWRRI
IWRRI number:
198301
Rights:
Rights to the digital resource are held by the University of Idaho. http://www.uidaho.edu/
Publisher:
Idaho Water and Energy Resources Research Institute; University of Idaho
Contributing Institution:
University of Idaho
Type:
Text
Format:
application/pdf
Cataloger:
KIT
Date Digitized:
2017-08-24

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Source
Preferred Citation:
"Water and potential evapotranspiration at irrigated and rangeland sites in southern Idaho. Partial research technical completion report", Idaho Waters Digital Library, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/iwdl/items/iwdl-198301.html
Rights
Rights:
Rights to the digital resource are held by the University of Idaho. http://www.uidaho.edu/
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