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Evaporation losses from containers of hellmann precipitation gauges
The evaporation losses from the container of an old galvanized Hellmann gauge, 7·1 cm2 aperture area, were five times greater than the losses from the container of a new gauge, 1·8 cm2 aperture area, of almost the same grey colour. The maximum evaporation from the old gauge amounted to 0·75 mm per day. The same evaporation losses in the Baye of Montreux basin over a period of 10 years from April to September amounted to 0·09 mm per measurement or to 0·7 per cent of the precipitation catch. There is a relationship between the monthly percentage evaporation losses and the ratio of evaporation ti ...[article]
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Available online: http://www.tandfonline.com/doi/pdf/10.1080/02626667409493902
in Hydrological Sciences Journal > Volume 19, No.2 (June 1974) . - p.231-236The evaporation losses from the container of an old galvanized Hellmann gauge, 7·1 cm2 aperture area, were five times greater than the losses from the container of a new gauge, 1·8 cm2 aperture area, of almost the same grey colour. The maximum evaporation from the old gauge amounted to 0·75 mm per day. The same evaporation losses in the Baye of Montreux basin over a period of 10 years from April to September amounted to 0·09 mm per measurement or to 0·7 per cent of the precipitation catch. There is a relationship between the monthly percentage evaporation losses and the ratio of evaporation time and rainfall duration (r = 0·803).
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Les pertes par évaporation d'un pluviomètre galvanisé de type Hellmann sont cinq fois plus importantes dans un appareil ancien que dans un appareil neuf de même couleur. L'évaporation journalière maximale d'un réservoir ancien correspond à 0·75 mm de précipitation. Ces mêmes pertes évaluées dans le bassinversant de la Baye de Montreux ont, sur dix ans, une valeur moyenne de 0·09 mm par jour, ce qui équivaut à 0·7 pour cent de la précipitation totale mesurée. Il existe une relation entre le pourcentage de l'évaporation d'une part et le rapport des durées d'évaporation et de précipitation d'autre part.Language(s): English
Format: Digital (Free), Hard copyTags: Water ; Hydrology ; Evaporation ; Precipitation forecasting
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