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1 <br />i <br />1 <br />i <br />i <br />1 <br />~r <br />BASIN 2 <br />Protect: Casae Rock puames <br />Location: Castle Rock, Coloratlo <br />Condition Pre-mining <br />Calculations tor: Tc <br />NOTES: <br />Worksheet 3: Time of concentration (Tc) or travel time (7't) <br />B}': JGG <br />Checked: JGJ <br />Sheet Flow (@yplicable to Tc only) Segment IC <br />7. Surface Oescdphon (table 3-1) .. ............................................ . <br />2 Mann~ng's roughness coed., n (fable 3-1 ) ......................................... <br />3. Flow IengN. L (total L <= 300 /t.) .................................................. <br />4. Two-Yr 24-hr rainfall. P2 ...................................................................... <br />6. Lantl slope, s .......................................... ............... ............ <br />8. Tt=10 007 (nL)"(0.8)]/(P2"(0.6) s"(0 4)] Compute Tt .......... ................ <br />Shallow concenyated flow <br />7. Surface descripaon (paved a unpavetl) ... ............................................ <br />6. Flow lengm. L ........................................ ......................................... <br />9. Watercourse slope. s ............................. ........................................... <br />f0. Average veloury. V (figure 3-t) ................. ..... ....................................... <br />17. Tt = U(3800 V) Compute 71 .................. <br />Channel Oow <br />12. Cross aechonal flow area. a ....... ............. .............. ......................... <br />13. Wettetl penmeter. Pw ............... ............... ............ ............................. <br />t4 Hydreulic radius, r =a/pw Computer ................ .... . <br />78. Channel slope. s .................................... ........................................ <br />18. Manning's roughness ceeR.. n ................. ...................................... ... <br />77. V = (1.49 r"(2/3) s"(12j)/n Compute <br />V <br />................... <br />78. Flow length. L .......... ....... ... <br />....................... <br />. <br />t 9. 7t = U(3600 V) Compute Tt ....................... <br />20. Watershed or subarea Tc or Tt (add Tt in steps 6,7,17 and 19) ........ <br />0.13 <br />Date: <br />Date: <br />5/26/95 <br />5/26/95 <br />0.49 <br />Segment lD TP2 TP3 <br /> unpaved unpaved <br />ft 1,194 1,140 <br />ft/ft 0.1047 0.0702 <br />fUs 5.22 4.27 <br />hr 0.064 0.074 0.14 <br />Segmem I[ <br />(210-V I•TR-55. Second Ed.. lone 1986) <br />Page 2 <br />hr 0.63 <br />