Egypt's Aswan High Dam, completed in the late 1960s, was built to control the flow of the Nile River and provide a reliable water supply for agriculture and other uses. The dam created Lake Nasser, one of the largest artificial lakes in the world, which serves as a crucial reservoir for the country. However, this massive body of water comes with a significant drawback: a large portion of its stored water is lost to evaporation each year. According to recent estimates, between 10 and 16 billion cubic meters of water—averaging around 12 billion—vanish annually through evaporation. This loss represents roughly 14 percent of the Nile’s total flow, a concern for Egypt, which is approaching a state of severe water scarcity. Lake Nasser has a storage capacity of approximately 157 to 169 billion cubic meters, making it a vital resource for Egypt. However, the region around the dam, particularly the Assuan area, is known for its extreme heat, dry climate, and low rainfall, which accelerate evaporation. The lake's surface is constantly exposed to the sun and wind, much like a large pot of water left in the open air, leading to significant water loss. This situation was not fully anticipated when the dam was constructed, despite the engineers' hopes that it would help mitigate droughts and improve agricultural productivity in the region. The annual evaporation from Lake Nasser is estimated at around 12 billion cubic meters—comparable to the annual flow of the Seine River in France. This loss is a substantial fraction of the Nile’s total flow and has raised concerns about the long-term sustainability of the dam. Historical data suggested lower evaporation rates, but more recent studies indicate that the loss has increased as the lake's surface area has expanded over time. In response to these challenges, Egyptian authorities have explored several solutions. One notable project is the Toshka emergency canal, which aims to divert water from Lake Nasser to the arid western desert, reducing the lake's exposure to evaporation. Other proposals include building underground reservoirs and covering parts of the lake’s surface to minimize water loss. However, these solutions remain controversial. Some experts are skeptical about their effectiveness, particularly regarding the potential impact on underground water sources, due to a lack of long-term data. Others argue that as long as the lake remains large and exposed, no technical solution can fully offset the annual water loss.