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<br />~ <br /> <br />r <br /> <br />( <br /> <br />Worksheet 3: Time of concentration <'fc) or travel time <'ft> <br /> <br />Byb <br /> <br /> <br />Project <br /> <br />-- <br />/ .Re:=-~ <br />~ <br /> <br />Location <br /> <br />Developed <br />T through aubarea <br />t <br /> <br />Checked <br /> <br />/-g <br /> <br />Data <br /> <br />.,).../f" <br />, <br /> <br />Data <br /> <br /> <br />per flow type can be uoed for each <br /> <br />NOTES: <br /> <br />Include e map, ochematic, or deocription of flow legmenta. <br /> <br />Sheet flow (Applicable to Tc only) <br />I. Surface deecription (teble 3-1) <br /> <br />Segment ID <br /> <br />............ <br /> <br />2. Monning's roughnese coeff., n (table 3-1) .. <br /> <br />3. Flow length, L (total L ~ 300 ft) .......... <br /> <br />4. Two-yr 24-hr rainfall, '2 .................. <br /> <br />5. Land slope, 8 .............................. <br />T _ 0.007 (nLlO.8 <br />6. t P 0.5 0.4 Compute Tt ...... <br />2 a <br /> <br />Shallow concentrated flow <br /> <br />Segment ID <br /> <br />7. Surface deBcrlptloft (paved or unpaved) ..... <br /> <br />8. Plow length, t ............................. <br /> <br /> <br />ft <br />in ~,& <br />ftlft -0/ <br />hr O.ff1 of- -IO.syl <br /> <br />L <br /> <br />9. Watercourse slope, . ....................... ft/ft ,t'~ <br /> <br />ft <br /> <br /> <br />10. Average velocity, V (fiaure 3-1) ........... <br /> <br />L <br />II. Tt - 3600 V <br /> <br />Compute Tt ...... <br /> <br />Cha nne I flow <br /> <br />Segment <br /> <br />. <br /> <br />12. <br /> <br />Croaa aectionel flow eree, a <br /> <br />............... <br /> <br />13. Wetted perimeter, Pv ....................... <br /> <br />14. <br /> <br />a <br />Hydraulic radluo, r - -- <br />pw <br /> <br />Compute ~ ....... <br /> <br />Channel slope, I ......,..................... ft/ft . <br /> <br />15. <br /> <br />ft/a <br /> <br />17. <br /> <br />MSnn1ng~. roughness coeff., n .............. <br />I 49 2/3 1/2 <br />V. . r. Compute V....... ft/. <br />n <br /> <br />16. <br /> <br />1ft) <br /> <br />hr <br /> <br /> <br />-lm <br /> <br />ID <br />ft2 <br /> <br /> <br />71"\ i' Jt' <br />.r Vz- <br />je-G.s <br /> <br />4- <br /> <br />u-" <br /> <br />ft <br /> <br />ft <br /> <br />1~\1J:' /1-' <br />10' t- <br />.;) B;,<I-- <br /> <br />18. Flow length, L ............................. ft <br />19. L Compute Tt <br />Tt - 3600 V ...... hr <br />20. Watershed or s~barea Tc or Tt (add Tt in stepa 6, II. and <br /> <br />-1~7~1 <br />19) ..~.... hr ,{> <br /> <br />(2lo-VI.TR-55, Second Ed., June 1986) <br /> <br />D-3 <br />