Manning's n From Experiments with Rainfall-Runoff on Portland Cement Concrete Surfaces

by Joseph R. Reed, Pennsylvania State Univ, University Park, United States,
J. Blaine Stong, Pennsylvania State Univ, University Park, United States,



Document Type: Proceeding Paper

Part of: Engineering Hydrology

Abstract: Experiments were conducted under artificial rainfall on Portland cement concrete (PCC) surfaces with variable mean texture depths (MTD) and slopes (S). Rain rates were varied up to 3 in/hr and a regression analysis of the measured sheet flow depths was combined with kinematic wave theory in order to define Manning's n. Results appear to indicate that n is inversely proportional to Reynold's number to an exponent other than one (1).

Subject Headings: Regression analysis | Portland cement | Surface waves | Kinematic waves | Rainfall | Flow measurement | Sheet flow

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