Yes. To Know the details of roof top rainwater Harvesting you should contact Executive Engineer,-W.D.-I , W.R.D. , Panaji for North-Goa and Executive Engineer,-W.D.-II , W.R.D. , Margao for South â€“Goa, Panaji. Please refer the Notification No.4-4/EO â€“WRD/450 , dated 16/10/2008 Published in official Gazette Government of Goa Series-I No.30 dated 23/10/2008. which deals with policy on Rainwater Harvesting. The Government provides subsidies on reimbursement basis , also institute an â€˜Annual Awardâ€™ carrying a citation and cash prize for the best Rainwater Harvesting practices in the State.