AGARTALA: The Planning Commission (PC) has given an investment clearance of Rs 14.89 crore for Rudrasagar Drainage Development Scheme of Tripura to be implemented by next one year, restoring the lost glory of only water palace of eastern India-Neermahal. Human activities around the Rudrasagar Lake in the past 50 years have shrunk the waster body by more than 40 per cent in the last half a century.