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<br />. <br />a.V. <br />20 <br /> <br />=- - --!!.E'RGY <br /> -!JRAOE LINE h <br /> -- - ---1 <br /> -- a <br /> .... <br />::t:.... <br /> , W <br /> , <br /> , <br /> - <br /> <br />e <br /> <br />. <br />tVt <br />20 <br /> <br />W52 <br /> <br />51 <br /> <br />DATUM <br /> <br />Figure 1. Representation of Terms in Energy Equation <br /> <br />The discharge-weighted reach length, L, is calculated as: <br /> <br />L = <br /> <br />LlobOlob + LchOch + LrobQrob <br />Qlob + Qch + Qrob <br /> <br />(3) <br /> <br />where: <br /> <br />reach lengths specified for flow in the left <br />overbank, main channel and right overbank, <br />respectively <br /> <br />arithmetic average of flows at the ends of the <br />reach for the left overbank, main channel, and <br />right overbank, respectively <br /> <br />Determination of a representative friction slope, ~f' is discussed <br />in Section 4. Selection of appropriate magnitudes for expansion and <br />contraction coefficients is discussed in Chapter 2, Section 5 and Appendix <br />IV. <br /> <br />Llob' Lch' Lrob = <br /> <br />Qlob' Qch' Qrob = <br /> <br />4 <br />