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ACCOUNTING FOR DISCREPANCIES IN PAN EVAPORATION CALCULATIONS 1
Author(s) -
Gunderson Lance H.
Publication year - 1989
Publication title -
jawra journal of the american water resources association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.957
H-Index - 105
eISSN - 1752-1688
pISSN - 1093-474X
DOI - 10.1111/j.1752-1688.1989.tb03094.x
Subject(s) - evaporation , environmental science , float (project management) , rain gauge , instrumentation (computer programming) , hydrology (agriculture) , sampling (signal processing) , atmospheric sciences , meteorology , geology , physics , precipitation , geotechnical engineering , engineering , optics , detector , marine engineering , computer science , operating system
Four experiments were made to document and account for differences in evaporation data that were calculated using pans equipped with float‐activated recorders and pans with hook gauge/rain gauge instrumentation. Paired in‐pan comparisons indicated that evaporation differences were not due to the technique of measuring water level within the pan. Also, the recorder float‐lag did not account for the differences. By sampling rainfall events, it was found that evaporation pans and standard (8 in. orifice) rain gauges record significantly different amounts of rain, which results in differences in calculated evaporation on rainy days. Monitoring networks with evaporation pans should have uniform instrumentation that accurately records rainfall into the pans for consistent results.