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<br />Time of Concentration (T c) or Travel Time (T,) <br /> <br />Project: CWCB - Elbert Hydrology By: J.Winters I Date: 5/31/2007 I <br />Location: Elbert County, CO Checked: I Date: I <br />Basin: Upper West Kiowa <br />Condition: Rural/undeveloped <br /> <br />Sheet Flow (Applicable to Tc only) <br /> <br />1. Surface description <br />2. Manning's n 0.4 <br />3. Flow length, L (total < 300 ft) fl 300 <br />4. Two-year 24-hour rainfall, P2 in 2.075 <br />5. Land slope, s flIfl 0.035443 <br />6. Tt hr 0.85 <br /> <br />Shallow Concentrated Flow <br /> <br />7. Surface Description (paved or unpaved) unpaved <br />8. Flow length, L fl 3700 <br />9. Watercourse slope, s flIfl 0.031323 <br />10. Kv 15 <br />11. Tt hr 0.39 <br /> <br />Channel Flow <br /> <br /> Segments 1 2 <br />12. Slope flIfl 0.0085 0.011 <br />13. Assumed Q from CWCB Reg. Eqn. cfs 5,000 2500 <br />14. Velocity. V flIs 10.37 8.9 <br />15. Flow length, L fl 43000 12100 <br />16. Tt hr 1.15 0.38 <br /> <br /> <br />20. Watershed or subarea Tc or Tt (add Tt in steps 6, 11, and 15) <br />21. Lag Time <br /> <br />hrl2.77l <br />min~ <br />