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`i <br />1 <br />i <br />1 <br />1 <br />BASIN 4 <br />Protect Castle Rock Ouames <br />Loraaon: Caste Rock, Colorado <br />Condition Pre-mining <br />Calculations for. Tc <br />NOTES. <br />Worksheet 3: Time of concentration (Tc) or travel time (Tf) <br />By: TPY <br />Checked: JGJ <br />Sheet Flow (p~pnlicable to Tc onlvl Segment I[ <br />1. Surtace desciption (table 3-1) ...................................... . <br />2 Monolog's roughness coeff., n (table 3-1 ) ...... .. ............................... <br />3. Flow length. L (local L <= 30011.) ........................ ............................... <br />4. Two-yr 24.hr rainfall. P2 ........................... ...................................... <br />5 Land slope. s .......................................... .............................. <br />6 Tt=10.007 (nL)"(0.a)I/(P2"(0 5) s"(0.4)1 ComPUte Tt .......................... <br />Date: <br />Date: <br />5/26/95 <br />5/26/95 <br />0.49 <br />Shallow concentrated Bow Segment ID <br />7. Surtace description (pavetl or unpaved) ..................................... ..... <br />B. Flow length. L .............................. ................................ <br />B Watercourse slope. s ........................................................ <br />10 Average velocity, V (figure 3-1) ...................................... <br />11. Tt = U(3600 V) Compute Tt <br />Channel Ilow <br />12. Cross sectional bow area. a ....... ... ........................ ...................... <br />13 Wetted perimeter. Dw .................. .. ........................ ..................... <br />14 Hydraulic radius, r =a/pw Compute r ................. .... . <br />15. Channel slope. s ............... ........... ........ ............................... .... <br />16. Manning'S roughness coeff , n ........... ....... ...................................... <br />17 V = (1 4B r"(2/3) s"(1/2))/n Compute V ...................... <br />16. Flow length. L ............................... ...... ......................................... <br />19. Tt = U(3600 V) Compute Tt ................... <br />20. Watershetl or subarea Tc or Tt (atld Tt in steps 6,7,11 and 19).......... <br />TP2 <br />unpaved <br />1,807 <br />0.0138 <br />1.90 <br />0.265 0.26 <br />h <br />NO <br />B/: <br />w <br />Segment IC <br />^2 <br />ft <br />(210-V I-TR-55, Second Ed.. June 1986) <br />Page 4 <br />0.09 <br />hr 0.84 <br />