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This article focuses on optimizing deep foundation designs in ephemeral streams to reduce costs. It explains the differences between perennial and ephemeral streams and how they impact the design of deep foundations. The article emphasizes the importance of accurately estimating pore water pressure (PWP) profiles in ephemeral streams for deep foundation designs, considering factors such as flood variations and the hydrogeologic setting of the stream. It suggests using laboratory tests and numerical models to estimate engineering properties of soils and evaluate infiltration fluxes and PWP profiles. The article concludes by highlighting the significance of accurate PWP estimation for structures in arid to semiarid regions, which are expected to expand due to global warming. [Extracted from the article]