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Worksheet 3 me of concentration <br /> (�, /(��--//y-/--__ %% (Tc) or tra time (Tt) <br /> Project !a 4/�k„ �,z-,..,n�� ByA& Date <br /> Location Checked Date <br /> Circle one: Present Developed <br /> Circle one: JC TC through subarea <br /> NOTES: Space for as many as two segments per flow type can be used for each <br /> worksheet. <br /> Include a map, schematic, or description of flow segments. - <br /> Sheet flow (Applicable to Tc only) Segment ID -Cp <br /> 1. Surface description (table 3-1) .Fy�^� j , _ n(r . 26�Z/•GYP 6�4� <br /> 2. Manning's roughness coeff., n (table 3-1 ^ ,U <br /> 3. Flow length, L (total L < 300 ft) ......... . ft 0 0 <br /> 4. Ta EX GSA P2 •.. .. •••.•• <br /> .... ... in .7 <br /> 5. Land slope, a ....... . ....... . ..... ..... . .. . ft/ft (91} <br /> 6. TC P2 0.5 0.4 Compute 0,00 (nL)0'8 C Tt hr + <br /> � s <br /> Shallow concentrated flow Segment ID <br /> 7. Surface description (mod--er-nRps.se OW = <br /> B. Flow length, L .... ft 1nQo nCr <br /> 9. Watercourse slope, s ..... . ,Ft ft/ft I , YQZS (INN <br /> 10. Average velocity, V , g�6... ft/s J�Z <br /> 11. TC - 3600 V Compute I .... .. hr <br /> i <br /> Channel flow Segment IDS <br /> 12. Cross sectional flow area, a f[2 <br /> 13. Wetted perimeter, p <br /> �w ft <br /> \ <br /> 1T4, Hydraulic radius, 8 <br /> .r Compute r ....... ft <br /> pw <br /> 15. Channel slope, s ....... ....... ..... . ft/ft <br /> 16. Manning's roughness coeff., n ... . ...... .... <br /> 17. V - 1.49 r2/3 s1/2 ``• <br /> n Com to V ..... .. ft/s <br /> 18. Flow length, L ....... . .. ...... .\............ ft <br /> 19. T C <br /> L / I <br /> [ � 3600 V Compute TC ,,,,,, hr + <br /> 20. Watershed or subarea Tc or Tt (add Tt in steps 6, 11, and 19) ....... hr <br /> ZL. = •6To = � <br /> (210-VI-TR-55, Second Ed., June 1986) D-3 <br />