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C <br />BASIN 1 <br />Protect. Castle RoU Uuamies <br />Location: Castle Rock, Colorado <br />ContliGOn. Pre-mining <br />Calculations tor: Tc <br />NOTES: <br />Worksheet 3: Time of concentration (7-c) or travel time (Tt) <br />By: JG! Date: 5/26/95 <br />Checked: JGJ Date: 5/26/95 <br />Sheet Flow (Applicable to Tc onlvl Segment IC <br />1. Surface tlescdption (fable 3-1) .................. ... ................ ................. <br />2 Manning's roughness well., n (ta01e 3-1 ) .................. ................ ...... <br />3. Flax length, L (total L <= 300 ft) .............. ............. ................. . <br />4 Two-yr 24.hr rainfall. P2 ......... ........................... ................ ......... <br />5. Lana slope, s ............................. ............. ............................... .... <br />6. Tt=[0.007 (nL)^(0.8)I/[P2"(0.6) s"(D.4)] Compute Tt .......... ................. <br />0.49 <br />Shallow concentrated flow segment to <br />7. Surface tlescnption (paved or unpaved) .............................................. <br />8. Flow length. L ........................... ................. .............. <br />9. Watercourse slope. s ..................................................... <br />10. Average velouh. V (figure 3-1) ...................................... <br />11. TI = U(3600 V) Compute Tt <br />lh2.ne1 flow Segment IC <br />12. Cross sectional gow area, a ............................ ............................... <br />73. Wetted Panmeter, Pw ..................................................................... <br />14. Hytlmulic ratlius. r =a/pw CompuM r ....... ............. . <br />15 Channel slope s ...... ................. .............. .............. ................ <br />16. Manning's roughness weft., n ........................................................ <br />17 V = (t 49 r"(2/3) s"(1/2))/n ComPUte V .......... ............ <br />70. Flow IengN. L ..... .............. ........................................ ................ <br />19. Tl = U(3600 V) Compute Tt .................. <br />20. Walershetl or subarea Tc or TI (atl0 TI insteps 6,7,11 and 19)........, <br />TP2 <br />unpaved <br />2,513 <br />0.0259 <br />2.60 <br />0.269 0.27 <br />fl <br />0/P <br />0/! <br />hr <br />0. <br />(210-V I-TR-55, Second Ed., lone 1986) <br />C:IPROJF.CTS\94189\TCON %LS <br />0.06 <br />hr 0.82 <br />Page 1 <br />