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<br />Worksheet 3: Time of concentration (Te) or travel time tTV <br /> <br />) Project UIYt - ~Ce By ;)~~d Date /",#6' <br /> t:- " <br /> 1..oc.a.tloft ".:).,<:>.e I' N't'9 C~. Checked Date <br /> Circle onel <br /> Circle one /-/ <br /> <br />NOTES: Space for aa many as two Begment' per flow type can be uBed for each <br />work.heet. <br /> <br />Include a map, Bchematic, or deBcription of flow segments. <br /> <br />Sheet flow (Applicable to Tc only) <br />1. Surface description (tsble 3-1) <br /> <br />Segment 1D <br /> <br />............ <br /> <br />2. Konning', roughness coeff., n (table 3-1) .. <br /> <br />3. Flow length, L (total L.i 300 ft) .......... ft <br /> <br />4. Two-yr 24-hr rainfall, '2 .................. in <br /> <br />S. Land slope, I .............................. ft/ft <br /> <br />T . 0.007 (nLlO.8 <br />6. <br />t P O. S 0.4 <br />2 a <br />Shallow concentrated flow <br /> <br />Compute Tt ...... <br /> <br />Segment ID <br /> <br />7. Surface description (paved or unpaved) ..... <br /> <br />( <br /> <br />8. Flow length, L ............................. ft <br /> <br />9. Watercourse slope, I ....................... ftlft <br /> <br />10. Aversge velocity, V (figure 3-1) ........... ftla <br /> <br />L <br />11. Tt . 3600 V <br /> <br />Compute 1t ...... <br /> <br />Channel flow <br /> <br />Segment <br /> <br />12. Cro'l leetlonal flow aTea. . ............... <br /> <br />13. Wetted perimeter. p. ....................... <br /> <br />14. <br /> <br />a <br />r .- <br />Pw <br /> <br />Compute r ....... <br /> <br />Hydraulic radius, <br /> <br />IS. <br />16. <br /> <br />Channel slope. I ........................... <br /> <br />ftlft <br /> <br />Hsnn1ng.. roughness coeff., n .............. <br /> <br />1 49 213 1/2 <br />V.' r a Com te V <br />n pu ....... <br /> <br />ftla <br /> <br />17. <br />18. <br /> <br />Flow length, L ........~.................... <br />L <br />It . 3600 V Compute Tt ...... <br /> <br />19. <br /> <br />hr <br /> <br />I <br />th '~e <br />p,/..N <br />3pp <br />d.. - () <br />-021 <br />'3.fI+T <br /> <br />hr <br /> <br />2- <br /> <br />tI,'R <br />/ ~(J" <br />.oz1 <br />Z.7 <br /> <br />'/~ + <br /> <br /> <br />11) <br />ft2 <br /> <br />.3 <br /> <br />4- <br /> <br />Z2..0 <br /> <br />ft <br /> <br /> <br />ft <br /> <br />/.~-;;J. <br />,01tJ <br />. ~S-~ <br /> <br />'05P <br /> <br />ft <br /> <br />6.z...) <br />~t> <br /> <br />/.It, <br /> <br />J. '14- <br />'1'l~-oP <br />+ s:-~ <br /> <br />hr <br /> <br />20. <br /> <br />WaterBhed or subs rea Tc or Tt (add Tt in StepB 6, II, and 19) ....... <br /> <br />( <br /> <br />(21o.VI-TR..55, Second Ed., June 1986) <br /> <br />.~ <br /> <br />.I,/.rl <br /> <br />~ <br />B' 'i <br />d'G't;.. .3 <br /> <br />:' <br /> <br />.~' F'7... <br />,.f) .1' <br />J:. <br />/0' z <br /> <br />.fe-G. 4- <br /> <br />"tl!:,.. <br /> <br />.I~'~~ <br />hr 7. /. <br /> <br />D-3 <br />