This document provides biographical information on five individuals who made significant contributions to fluid mechanics and hydraulics: - Henry Darcy received the Legion of Honor for his pioneering work theorizing the boundary layer in fluid flow. - Julius Weisbach received honorary degrees and membership in prestigious scientific organizations in recognition of his accomplishments. - Osborne Reynolds was elected to the Royal Society and received the Royal Medal, though his early work focused on other fields before turning to fluid mechanics. - Allen Hazen received the Thomas Fitch Rowland Prize and Norman Medal for his work in hydraulics, flood control, water purification, and sewage treatment. - Gardner Williams rose to national prominence as a