Water Storage infiltration Model for Permeable Asphalt Pavement and Its Efficiency

Abstract:

Rainfall process was numeralized and the physical process of rainwater infiltration was divided into four steps. Pavement materials parameters such as rainwater adsorption rate, permeation rate, air voids content/connected air voids content, pavement thickness and precipitation parameters such as rainstorm return period, rainfall duration were selected for permeable asphalt pavement water storage infiltration model based on the theory of meteorology and hydraulics, and the target of function design was put forward. Then, the efficiency of water storage and infiltration for permeable asphalt pavement was calculated and analyzed. Results show that the model can predict and evaluate the function of water storage and infiltration for permeable pavement in different regions on different meteorological and rainfall condition. Maximum water storage occurs in the pavement behind the time the rainfall intensity reaches its peak. The water storage structure layer can be thickened or longitudinal drainage pipe can be employed in the pavement structure if the permeable pavement structure can not meet the demand of water storage or infiltration function for some precipitation condition.