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Da-s' <br />Worksheet 3: ~Yme of concentration (Tc) or travel time (Tt) <br />Protect !T 0.V fie l/ C~2/7 Hy _ Date <br />Loeatlort ~ ~- S Checked Date <br />Circle one: Present Developed <br />Circle one: Tt Tt through subarea <br />HOLES: Space for as mangy as two segments per floe type can be used tot carp <br />worksheet. <br />include a msp, schemstle, or deeeription of floe <br />Sheet Clow (Applicable to Te only) Segmeot ID <br />i <br />1. Surface deecripCion (table 7-1) ............ <br />2. lfaming'a roughness eoeffi., n (table 3-1) .. <br />3. Flou lengtR, L (total L C 300 ft) .......... ft <br />t. Tvo-yr 26-hr ralnfall~,.82 .................. in <br />S. Land s1oPe, • .... ..................... ![/It <br />..... <br />0.007 (nL)0.8 <br />6. Tt + P~ ~` Compute tt ...... hr <br />2 <br />Shallow concentrated flou _ ~ Segment ID <br />7. Surface deseriptioa (paved or unpaved) ..... <br />8. Plow length, L .......:..................... ft <br />9. Vatareourse elope, ^ ....................... ft/ft <br />10. Averagn velocity, Y (figure ]-I) ........... ft/s <br />11. Tt + 3600 V ~ -•Computa it ...... hr <br />Channel floe ~ ~. ~ Segment ID <br />12. Cross aeetlonal [low area, ~a ............... ft2 <br />17. Vetted perimeter, p .. ..... ..... ft <br />v. ' <br />14. Hydraulic: radius, r~~.P Compute r ....... fe <br />v <br />15. Channel slope, • ................::......... ft/!t <br />16.. Hanning's. toughness eoeff., a .............. <br />1.49 r2/3 sl/2 <br />17. Y ~ n ~ Compute Y ....... ft/s <br />18. Flou length, L ............. ................. ft <br />19. Tt 3600 V ~ ~~Compute Tt ...... hr <br />29. Vaterehed or subarea Tc or Tt (add Tt in steps 6, t <br />.. v <br />t <br />+f0 <br />/, 3 <br />.- <br />~, a <br />B.ol + .or <br />•, and 19) .. r. .., hx <br />CL10-VI-TR-55, Second Ed., June 1986 <br />,03 <br />ry <br />D•3 <br />v~b <br />