149) For the buildings having a low permeability, the internal wind pressure acting normal to the wall and roof surfaces is taken as[where p is basic wind pressure]

150) The relation between intensity of wind pressure p and velocity of wind V is taken as

151) The live load for a sloping roof with slope 15°, where access is not provided to roof, is taken as

152) The internal pressure coefficient on walls for buildings with large permeability is taken as

153) The basic wind speed is specified at a height ′h′ above mean ground level in an open terrain. The value of′h′ is