Calculate the time of concentration of the dense grass watershed where the length of the main river

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Calculate the time of concentration of the dense grass watershed where the length of the main river is 2,000 m, the length of drainage is 1,200 m, and the average slope is 2%. If the curve number is estimated at 70, use the equations below for calculation.

a. Kerby-Hathaway formula

b. Kirpich’s methods

c. Van Sickle equation

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