Time of Concentration in Small Rural Watersheds

by 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

Abstract:

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.

Subject Headings: Kinematic waves | Comparative studies | Wave equations | Watersheds | Case studies | Rural areas | Parameters (statistics)

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