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<br />Note: Time of cnncrntratlon (Tc) may be computed using el [her [revel <br />time or lag as shown below. ('f}~ere are other methods used to <br />obtain Tc which may be preferred over t}~c ones al~ovn below.) <br />Method 1 - Peak Flw Using Tc vs. CSM Charts: <br />A <br />:~~ • <br />cation of 7c Usinc Travel Time <br />!e _ Length of Seem_ent (Li) ~ Ll + L2 + L3 + ...Ln x 1 <br />Hrs. <br />Velocity Through Segment (VS) V1 V2 V3 Vn 3600 <br />1.1-Ft. Vi-Ft/Sec. <br />B• Computation of Tt Lasing Lag 1/ <br />~ ~~ ft. <br />Slope Data: watershed Height (z) ~ ~~./ <br />Contour I.eng[h (LC25)~ - -~=-ft. X25'. of (z) <br />Contour Length (LC 60) - ~~`~~' ft. ?50': of (z) <br />Contour Length (LC75) - `~`7~t. @75% of (z) <br />Drainage Area (DA) - /~ '`_ i7bt^~q ft <br />.25z(LC25 + LCSQ + LC75) <br />Slope ~ -_ x 1007 ~ - / __7 <br />Hydraulic Length or Floe Length - - <br /> <br />o <br />e <br />S Hydraulic La ~ T (hr) <br />j <br />( Length <br />(f t} Soil Cover <br />Complex t~'o. (FS 3 3 TR-55) <br />g~(hr)' (1667 x <br />Col. 4) <br />(1) , (3) <br /> _ _ <br /> <br /> <br />C. Peak Flc~: <br /> <br />Tc <br />(h r) <br />11 Peak Disc` <br />cfs/!n./sq.c1.) <br />(F1 S-'_) <br />~_ - <br />Total Area <br />(sq. mf.) <br />O) Stor <br />requency <br />(yr.) <br />(4) m <br />p.un~ff <br />(ir~5) <br />(` Total Peak <br />Discharge (cfs) <br />(Col. 2x3x5) <br />(F) <br />~ ~ <br />•t2 _ ~ v~ U <br />oU __ <br />_ <br />/o <br />---_ <br />2 <br />~ ~ ~u c, <br />__~ _. <br />__ Z S= 2~ <br />1/ Intended for watersheds in their natural condition <br />unbar, areas exist use Page 4 for modification.. <br />If Significant <br />Page 2 <br />