Évaluation Du Bilan Hydrique À Anosibe Ifanja (Madagascar) Durant La Période 2009 À 2018

Liva Harimanana RANDRIAMAMPIANINA, Raymond Rakotondrazafy, Njararivelo Louisa Ramiandrisoa

Abstract


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This article aims to evaluate the water balance of the rural commune of Anosibe Ifanja, located in the Itasy region (Madagascar), over the period 2009–2018, within a context characterized by a heavy reliance on rain-fed agriculture. The water balance was estimated using monthly precipitation and average temperature data, applying the Thornthwaite method. The results highlight a highly seasonal hydrological pattern, characterized by a short surplus period and a long deficit period. Although the average annual rainfall is relatively high (1638.4 mm), water availability remains primarily concentrated between the months of December and March. Actual evapotranspiration accounts for 41% of annual precipitation (673.9 mm), while the water surplus reaches 964.5 mm. The distribution of this surplus reveals a clear dominance of infiltration (47%, or 771.6 mm) compared to surface runoff (12%, or 192.9 mm), emphasizing the critical role of aquifer recharge. These findings provide relevant data for the sustainable management of water resources and the identification of recharge zones in the Itasy region.


Keywords


Water balance; Thornthwaite; Groundwater recharge; Infiltration; Hydrological seasonality; Itasy; Madagascar; Anosibe Ifanja

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References


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DOI: http://dx.doi.org/10.52155/ijpsat.v56.1.7854

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