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t <br />1 <br /> <br />BASIN 5 <br />Project: Castle Rock Ouarties <br />Location: Caste Rock, Colorado <br />Condition: Pre-mining <br />Calculations tor: Tc <br />NOTES: <br />Worksheet 3: Time of concentration (Tcj or travel time (Tt) <br />By: TPY <br />Checked: JGJ <br />Sheet Flow (Applicable to Tc onlvl Segment I[ <br />1. Surtace tlescnPBon (table 3-1) .................................................................. <br />2. Manning's roughness coert., n (table 3-1) ... ... ...... ............ .... .... <br />3. Flow IengN, L (total L c= 30011.) .............................................................. <br />4 TwaYr 24.hr reinFall. P2 ...................................................................... <br />5. Land slope. s ......................................... ........ ...................... <br />6. T1=[0.007 (nL)"(0.6)JtIP2"(0.6) s"(0.4)) ComPUle Tl ... ........ ....... <br />Date: <br />Date: <br />5/26/95 <br />5/26/95 <br />0.28 <br />Shallow concentrated flow Segment ID <br />7. Surtace tlescdptlon (paved or unpavetl) .... ...................................... ........ <br />e. Flow length. L ................................ ...................................... ......... fl <br />9. Watermuree slope. s .................... .... . ... ...... ............... ......... 0/A <br />to Avere9e velorJly, v (figure 3-1 ) ................. ................................ ........ R/~ <br />t 1 Tt = U(3600 V) Compute Tt ... .. .. ... W <br />Channel flow Segment I[ <br />12. Cross sectional now area. a ...................... .......................... .. . ...... <br />13. Wettetl perimeter. Pw ................................ ............................ ... . ........ <br />14. Hytlreulic radius. r =a/pw Compute r . ... ...... ......... <br />16. Channel slope. s ................................. ...................................... ....... <br />18. Manning's roughness CoeR., n .. ... .... .... ...................................... ........ <br />77. V = (1.49 P(2/3) s"(1/2)I!n Compute V. <br />....... ......... <br />..................... <br />16. Flax length, L .............. ... <br />....... <br />.... ........ <br />79. Tt = U(3600 V) Compute Tl . ........ ........ <br />20. Watershed or subarea Tc or TI (add Tl in steps 6 7,11 ono 1B).......... <br />(210-V 1-TR-55, Second Ed., June 1986) <br />Page 5 <br />TP2 TP2 <br />unpaved unpaved <br />1,020 915 <br />0.049 o.la7s <br />3.57 6.20 <br />0.079 0.041 0.12 <br />0.00 <br />hr 0.40 <br />