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<br />.. <br />I <br />\ <br /> <br />( . <br />( <br /> <br />c_ <br /> <br />Worksheet 3: Time of concentration (Tc) or travel time <Tt> <br /> <br />B~ <br /> <br />project/-A/e::: -y k'~ <br /> <br />tocatiotl ~,KJ/./Af CA!' <br /> <br />Circle onel ~en0 Developed <br /> <br />Circle one~ Tt through subarea <br /> <br />NOTES I Space for a. many al two segment. per <br />. . worbheet. <br /> <br />Checked <br /> <br />Date ~ <br />Date <br /> <br />/-4 <br /> <br />flow type can be uled for each <br /> <br />Include a map, .chematic, or deacription of flow eegmente. <br /> <br />Sheet flow (Applicable to Tc only) <br /> <br />Segment 1D <br /> <br />I. <br /> <br />Surface de.crlption (table 3-1) <br /> <br />............ <br /> <br />2. Manning'. roughne.. coeff., n (table 3-1) .. <br /> <br />3. Flow length, 1. (total 1..i 300 ft) .......... <br /> <br />4. Two-yr 24-br rainfall, P2 ,................. <br /> <br />5. Land slope, I II............ It ........,... II <br /> <br />6 T. 0.007 (n1.)0.8 C t T <br />. t P 0.5 0.4 ompu e t ...... <br /> <br />2 a <br /> <br />Shallow concentrated flow <br /> <br />Segment ID <br /> <br />7. Surface de.criptlon (paved or unpaved) ..... <br /> <br />8. Flow length, L ............................. <br /> <br />/ <br /> <br /> <br /> 0-/3 <br />ft ..1al <br />in d-O <br />ftlft .~I <br />hr a -la~1 <br /> <br />2.. <br /> <br />9. W.ltercour.. alope. a I,..................... ft/ft ' tJt) 7 <br /> <br />ft <br /> <br />/2.?p() <br /> <br />10. Average velocity. V (ftaure 3-1) ........... <br /> <br />1. <br />11. Tt . 3600 Y <br /> <br />Compute Tt ...... <br /> <br />Cha nne 1 flow <br /> <br />Segment <br /> <br />. <br /> <br />12. Cro.. seet!on.l flow area, . ............... <br /> <br />13. Wetted p_rlmeter. Pw ....................... <br /> <br />14. <br /> <br />a <br />Hydraulic: radius. r . - Co",pute c:' .,...... <br />Pw <br />Channel 8lope, , ........................... <br /> <br />IS. <br />16. <br />17. <br /> <br />Manning', Toughnes8 coeff., ft.............. <br />1 49 2/3 1/2 <br />V. . T. CotDpute V....... <br />" <br /> <br />. tJ 1S- <br />3.27 <br />zgtwO <br />, tr -1_3-.11\ <br /> <br />........ br l,../Z- <br /> <br />ft/s <br /> <br /> <br />hr <br />ID 4- <br />ft2 18"-1 <br />ft 1-'.47 <br />ft /. 1-1- <br />ftlft . pO <br /> <br /> <br /> <br />ft/s <br /> <br /> <br />18. Flow length, L ............................. ft <br />19. 1. Compute Tt <br />Tt - 3600 Y ...... hr <br />20. Watershed or s~barea Tc or Tt (add Tt in steps 6, II, and 19) <br /> <br />(210-VI-TR-65, Second Ed., June 1986) <br />. . <br /> <br />-Iz-?'?I <br /> <br />~ 'fI.S'~ <br />\...Cfl~ <br />~ <br />..5tr6.3 <br /> <br />i%'~- <br /> <br />" <!.- <br /> <br />..?&:;. f <br /> <br />D-3 <br /> <br />., ~ <br />