Authors: Zhan, G; Lin Shelp, M


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Zhan, G & Lin Shelp, M 2009, 'Modified Blaney-Criddle method — an empirical approach to estimate potential evaporation using air temperature', in AB Fourie & M Tibbett (eds), Mine Closure 2009: Proceedings of the Fourth International Conference on Mine Closure, Australian Centre for Geomechanics, Perth, pp. 461-471,

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Potential evaporation (PE) or potential evapotranspiration (PET, ETo) is one of the fundamental elements in the hydrologic cycle. The Blaney-Criddle (B-C) method is the simplest approach for estimating PE as it requires only temperature data for input. It has been found that the B-C method can provide accurate estimates for moderate climates. Under extreme climatic conditions the B-C method is inaccurate. This paper presents a modification to the original B-C method which was calibrated to the observed meteorological data at Barrick sites. The modified method estimates PE with improved accuracy and is applicable to a wide range of climate conditions (from 300 mm/y in humid climates to 4,000 mm/y in arid climates) and wind regimes. The proposed approach will provide a simple and practical PE (PET) estimation tool for mining engineers and hydrologists when dealing with mine-wide water management during life-of-mine and closure planning.

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