/ http://www.slideshare.net/images/logo.gif / 際際滷Share feed for 際際滷shows by User: venugopalvellat7 https://cdn.slidesharecdn.com/profile-photo-venugopalvellat7-48x48.jpg?cb=1523421189 Engineer-Post graduate in public health engineering-Retired as chief engineer in kerala water authority-now,consultant for water and sewerage systems