Time of Concentration in Small Rural Watershedsby Constantine N. Papadakis, Univ of Cincinnati, Cincinnati, OH, USA,
M. Nizar Kazan, Univ of Cincinnati, Cincinnati, OH, USA,
Document Type: Proceeding Paper
Part of: Engineering Hydrology
A comparison was performed between the exponents of the independent variables L, S and i of the four-parameter time of concentration equation and eleven frequently encountered equations. This comparison led to the following conclusions: The exponents of L in the equations of Carter, Kinematic, Wave Morgali, FAA and Kerby agree within plus or minus 20% with the exponent a of the four-parameter equation. The exponents of S in the equations of Izzard, FAA, Kerby, Carter, Kinematic Wave, Morgali and Singh agree within plus or minus 25% with the exponent y in the equation. The exponents of i in the equations of Kinematic Wave, Morgali and Singh agree within plus or minus 15% with the exponent z of the equation. Three case studies were also used to compare the time of concentration computed from the four-parameter equation with the values obtained from the other eleven equations and measurements. Study results are discussed.
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