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<br />LESSON 3 <br />~)TREAM STABILITY - HYDRA.ULlC FACTORS AND PRINCIPLES <br /> <br />I. REVIEW OF HYDRAULIC F'RINCIPL.ES <br /> <br />A. Definitions (types of flow). <br /> <br />1, Steady flow <br /> <br />Depth of flow at a givEm cross section does not change or it can be <br />assumed to be constant during the time interval ull1der consideration. <br /> <br />2. Unsteady flow <br /> <br />Depth of flow at a given cross section changes with time, <br /> <br />3. Uniform flow <br /> <br />Depth of flow is the same at every section alon!g the length 01' the <br />channel. <br /> <br />4. Varied flow <br /> <br />Depth of flow changes along the length of the channel. <br /> <br />a. Gradually varied flow <br /> <br />b. Rapidly varied flow <br /> <br />5. Steady, uniform flow <br /> <br />An idealized concept of open-channel flow which seldom occ:urs in <br />natural channels. However, for many practical highway applications, <br />the flow is steady and changes in width, depth or directic)l1 are <br />sufficiently small that flow can be com;idered uniform. <br /> <br />3.1 <br />