The mass transfer equation was introduced into heat transfer model of falling film evaporation. The radial velocity, mass diffusion coefficient and variation of film thickness were taken into account.

By indoor and field simulated experiments of infiltration and evaporation of the rainwater, the paper studies the depth and velocity of infiltration and the daily evaporation.

The rate of water evaporation, shrinkage strain and the area of cracks increase with increasing exposure temperature and wind velocity, and with decreasing relative humidity.