Estimation of Angle of Deflection of Rain at Driving Rain Prone Stations in India

Abstract

A simple method for estimation of mean angle of deflection i.e. slant angle of wind driven rain from vertical has been recapitulated. The method has been used for computation of average slant angles of rain for twelve driving rain prone stations, viz., Bhopal, Mumbai, Calcutta, Cochin, Indore, Kodaikanal, Mangalore, Port Blair, Sagar Island, Tiruchchirapalli, Tiruvananthapuram, and Veraval. Based on ten years data on mean hourly wind speed and hourly rainfall, the cumulative probability distribution of angle of deflection of rain at these stations were determined and optimum values of these angles were worked out. The values vary broadly from 50 o to 65 o for the stations covered in the present study.

Estructuras de membrana en los trópicos: tecnología de construcción y adaptación climática

“…The wind-driven rain is a design issue because it considerably reduces the protected area beneath the membrane structure. The inclination angle of raindrop trajectories increases proportionally to wind speed (Chand & Bhargava, 2005). During storms, raindrops may be dragged by the wind force almost horizontally and pass through the membrane structure, leaving the space underneath unprotected as shown in Figure 28.…”

Structural Design Feasibility Study for the Global Climate Experiment

“…Each plot had a 4 m border between it and either the adjacent plot or the roof edge. Chand and Bhargava (2005) provide estimated rainfall angles of 23 degrees with wind speeds of 5 m s -1 and 41 degrees with 15 m s -1 winds. The 4 m roof overhang was selected to protect the plots from most of the wind driven raindrops when winds were less than 5 m s -1 .…”