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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: 6/1/2007 I <br />Location: Elbert County, CO Checked: I Date: I <br />Basin: Neffs Gulch <br />Condition: Rural/undeveloped <br /> <br />Sheet Flow (Applicable to Tc only) <br /> <br />1. Surface description <br />2. Manning's n 0.24 <br />3. Flow length, L (total < 300 ft) fl 150 <br />4. Two-year 24-hour rainfall, P2 in 2.05 <br />5. Land slope, s flIfl 0.114286 <br />6. Tt hr 0.20 <br /> <br />Shallow Concentrated Flow <br /> <br />7. Surface Description (paved or unpaved) unpaved <br />8. Flow length, L fl 200 <br />9. Watercourse slope, s flIfl 0.114286 <br />10. Kv 15 <br />11. Tt hr 0.01 <br /> <br />Channel Flow <br /> <br /> Segments 1 <br />12. Slope flIfl 0.015 <br />13. Assumed Q from CWCB Reg. Eqn. cfs 2,504 <br />14. Velocity. V flIs 9.84 <br />15. Flow length, L fl 34600 <br />16. Tt hr 0.98 <br /> <br /> <br />20. Watershed or subarea Tc or Tt (add Tt in steps 6, 11, and 15) <br />21. Lag Time <br /> <br />hrl1'!i9l <br />min~ <br />