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<br />Energy Equ'ation <br /> <br />fP*Cfl6~ <br />(h 4-hv)l ~ (h +hv)2 T (hf )1-2-Y k(lt <br />~ <br />Where: <br /> <br /> <br />The energy equation is: <br /> <br />h = elevation of the water surface at the respective <br />sections above a common datum <br /> <br />~ = velocity head at the respective section <br /> <br />hf= energy loss due to boundary: friction in the reach <br />. <br /> <br />b- II ~ = change in velocity head at cross sections <br />k = expansion/contraction coefficient. Value is zero for <br />contracting reaches and 0.5 for expanding reaches <br /> <br />\.~ <br />