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Time of Concentration. Example. In the given watershed, the runoff reaches the outlet through two tracks; Track A: 0.7 km in urban area average overland flow velocity of 0.5 m/s and 0.5 km in open land with average flow velocity of 0.2 m/s Track B: 1.0 km with average flow velocity of 0.2 m/s

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example
Example
  • In the given watershed, the runoff reaches the outlet through two tracks;
    • Track A: 0.7 km in urban area average overland flow velocity of 0.5 m/s and 0.5 km in open land with average flow velocity of 0.2 m/s
    • Track B: 1.0 km with average flow velocity of 0.2 m/s

Calculate the time of concentration in Hrs? then determine the design storm intensity for 10 years return period.

B

A

Outlet