The Effect of rainfall intensity, pavement cross slope, surface texture, and drainage length on pavement water depths

Reported herein are the results of a study concerned with determining the amount of water which can be expected to exist on various pavement types under normal ranges of pavement cross slopes, rainfall intensities, pavement textures, and drainage lengths. Equations are developed which relate these variables and their relative effects to water depth. Results are presented in both tabular and graphic form. Background information are pertinent past research pertaining to hydraulics of water flow over paved surfaces are given. Nine different type surfaces were tested. The surfaces were placed on ~ndividual 28-foot long by 4-foot wide, double tee, prestressed concrete beams. Rainfall of uniform intensity was applied to the surface. Water depth measurements were taken at regularly spaced drainage lengths for various combinations of rainfall intensity and pavement cross slope. Multiple regression analyses were used to determine the best fit of the data.