Driving Rain and its Use in Design of Building

Abstract

The studies carried out on driving rain and its use in design of buildings has been reported in this paper, Rain carried along at an angle to the vertical by the wind and driven on to walls is known as driving rain, This causes physical and chemical deterioration of walls, Thus, knowledge of intensity of rain fall and its angle of deflection from vertical is necessary to protect the building

against the rain, Annual average driving rain index (AADRI) for 350 stations spread all over India has been worked out. Based on AADRI values, the level of exposure of buildings to wind driven rain at these stations has been classified as (1) shielded, (2) moderate, (3) high, and (4) severe, A map of India depicting driving rain exposure classification has also been produced, The value of slant angle of wind driven rain from vertical vary broadly from 50 to 60° for the stations covered in the study.