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Taole 21.11--£yustions used in construction of ESH and FH <br />Equation Ao. <br />• <br />• <br />Tp ~ 0.7 To 21.4 <br />Rev. ~ TO 21,5 <br />T° Tp rev. <br />qp ~ 484 A 21.6 <br />Rev. Tp <br />t ~ (t/Tp) (Rev. p) 21.7 <br />q - (qc/qp) Qqp 21.8 <br />where A ~ drainage area is egture miles <br />q 2~ydrograph rate in cfe <br />9c ~ L~ydrograph rate in cfs when Q = 1 inch <br />4p ~ ~rograph peak rate in cfe when Q = 1 inch <br />Q ~ design storm runoff is inches <br />Rev. Tp ~ revised time to peak is hours <br />t = time in hours at which hydrograph rate is computed <br />Tc ~ time of concentration in hours <br />To = duration of excess rainfall in hears <br />(To/Tp)rey, =revised ratio from table 21.16 <br />Tp time to peak in hcure for CTU design t~ydrographs <br />• <br />