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-. <br />1 <br />1 <br />1 <br />'\~" <br />1 <br />Protect' Castle Rock Ouanies <br />Location: Castle Rork. Colorado <br />COndl6on' Pre-mining <br />Calculations tor: Tc <br />NOTES: <br />Worksheet 3: Time of concentration (Tc) or travel time (Tf) <br />By: TPY <br />Checked: 1G1 <br />Sheet Flow ((~yylicable to Tc only Segment IC <br />1. Sudaca descdptlon (table 3-1) ...................... ... .. <br />2 Manning's roughness meR., n (table 3-1) .... .... ................................... <br />3. Flow length, L (total L <= 30011.) ..... .. .. ............ ......................... <br />4. Two-Yr 24.hr ainlall, P2 .................... .. .. ................ ...................... <br />5. Land slope. s ....................................... .......... . <br />.............................. <br />6. Tt=~0.007(nL)"(o.fi>I/(PZ"(o.s)s^(o.a)~ computert ............................... <br />Shallow concentrated Bow <br />7. Sudace descdption (pavetl or unpaved) .............................................. <br />6. Flow length. L ......................... ....................................................... <br />9 Watercourse slope. s .......................... ................................. ..... <br />10 Ave29e velocity. V (figure 3-1) ....................... ....... ......................... . <br />11. Tt = D(3600 V) Compute Tl ............... .. <br />0_01 <br />n <br />Segment lD <br />Channel Bow Segment lC <br />12. Cross sectional flow area, a ............... ................................................. <br />13 Wenetl Perimeter, Pw ........................ ..... ..................................... <br />74. Hytlraulic 2tl~us, r =a/pw Computer .... .................... <br />15. Channel slope. s ............ .. .......... ................. .............................. <br />16. Manning's roughness coeR , n .......... ........ ............................... .... <br />17 V = (1 49 r"(2/3) s"(1/21)~n Compare V........ ............ <br />............... <br />76. Flow length. L ................ .......... <br />....... ................... <br />19. Tt = D(3600 V) ComPUle Tl ..................... <br />20 Watershetl or subarea Tc or Tt (atltl Tt in steps 6,7,11 and 19).......... <br />BASIN 3 <br />B <br />B/B <br />Ns <br />h, <br />Dale: <br />Dale: <br />5/26/95 <br />5/?6/95 <br />0.49 <br />TP2 <br />unpaved <br />1,230 <br />0.0407 <br />3.26 <br />0.105 0.10 <br />(210-V 1-TR-55, Second Ed., June 1986) <br />Page 3 <br />0.1 B <br />hr 0.77 <br />