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Most dams lose capacity as a result of three principal phenomena: leakage, sedimentation and evaporation. The study of these phenomena is particularly important as they can also endanger the dam’s stability. Here, we examine the case of the Gargar dam in western Algeria. This dam is located in an arid zone where water resources are becoming increasingly scarce. It is situated 5 km from the city of Ghelizane and is subject to considerable water loss. It has never been filled to capacity, and is now threatened by leakages that are clearly evolving over time. This article extends our earlier studies of the dam. Our work has estimated total average losses of 25 million m 3 /year for the period 1988–2015, made up of leakage (0.3 million m 3 /year) and evaporation (18 million m 3 /year), while dead storage accounts for 4.6 million m 3 /year. However, total losses for 2004 were estimated at 113.9 million m 3 , which increased to the alarming value of 166.8 million m 3 in 2015. We analyze variation in leakage as a function of the reservoir level, and quantify losses due to leaks, sedimentation and evaporation. Keywords: Gargar Dam; Leakage; Sedimentation; Evaporation; Arid areas; Algeria

The surface water storage problem in arid regions: a case study of the Gargar Dam, Algeria