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<br />given time, the flow is uniform. Otherwise, the flow is nonuniform, <br />and the relationship between kinetic energy and. potential energy will be <br /> <br />continuously changing. If flow is uniform. the water surface will be <br />parallel to the channel bottom. If not, the sl~pe of the water surface <br />profile will differ from that of the channel bottom. <br />If the rate of change of water surface slope is not visible to <br />the eye. the flow can be considered gradually varied. Rapidly varied <br />flow exists where the change in water surface slope is apparent to <br />the eye. such as at a hydraulic jump. The calculation of profiles <br />under rapidly varied flow conditions requires special treatment. <br /> <br />Section 3.04. Classification of Steady Flow Profiles <br /> <br />Figure 3.03 shows the general types of steady flow profiles. <br /> <br />M, <br />1 ~ <br />On . 2 <br />- ------ - \ <br />T _ _ .. <br />Dc M - . -- <br />~~ ~Dc>D <br /> <br />;,,~,. .. ,~, ... <br /> <br />"" <br /> <br /> <br />ItoIlzoo"'" <br /> <br />-D>Dn>Dc <br />DiI.D.Dc <br /> <br />Mild slope <br />50>0, Dn.Dc <br /> <br />Steep slope <br />Sa-O, Dn< Dc <br /> <br />'h <br /> <br />-r--- c, <br />Dn'Dc ,;;--- - <br /> <br />Horlzontol <br /> <br />- <br /> <br />'-- <br />#"...,.,......................./ <br /> <br />Dn'CD <br /> <br />~ <br /> <br />\ <br />_n__ -- ---__ --7'J.- <br />,~oc <br /> <br />Crlticol lIope <br />S,,>O,D.,:Dc <br /> <br />, <br /> <br />Horizontal <br />~ <br />-.1.,---- <br /> <br />---l---/As <br /> <br />, ~, <br /> <br />Dn:CO <br /> <br />Horlzontol Iiope <br />50'0, Dn'oo <br /> <br />Ad.e,.. lIope <br />SoCO, Dn'oo <br /> <br />Fig. 3.03. <br /> <br />Classification of flow profiles <br />3.08 <br />