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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Lesson 2 <br /> <br />Basic Hydraulics - Participant Workbook <br /> <br />2.1 BASIC DEFINITIONS <br /> <br />DEFINITIONS <br /> <br />. STEADY FLOW .VS. UNSTEADY FLOW <br />. UNIFORM FLOW .VS. VARIED FLOW <br />. STEADY, UNIFORM FLOW <br />. SUBCRITICAL AND SUPERCRITICAL <br />FLOW <br />. CONTROL SECTION <br /> <br />2.1 Definitions <br /> <br />A. Steady flow. Depth of flow at a given crOSS section does not change or it can <br />be assumed to be constant during the time interval under consideration. <br /> <br />B. Unsteady flow. Depth of flow at a given cross section changes with time. <br /> <br />C. Uniform flow. Depth of flow is the same at every section along the length of <br />the channel. <br /> <br />D. Varied flow. Depth of flow changes along the length of the channel. Varied <br />flow may be either gradually varied or rapidily varied. <br /> <br />E. Steady, uniform flow. An idealized concept of open-channel flow which <br />seldom occurs in natural channels. However, for many practical applications, <br />the flow is steady and changes in width, depth or direction are sufficiently <br />small that the flow can be assumed as uniform flow. <br /> <br />F. Subcritical flow. A flow condition that can be generally described as relatively <br />deep with low velocity on a mild slope. <br /> <br />G. Supercritical flow. A flow condition that can be generally described as <br />relatively shallow with high velocity on a steep slope. <br /> <br />H. Control Section. Any cross section for which the depth of flow can be <br />uniquely predicted for a given discharge. <br /> <br />2-3 <br />