We have a case were our site lies within a densely urban city , where they have minimal events of rainfall but with huge amounts- therefore allover the city they collect the rain water through infrastructure (rainwater collection network) where they collect water and remove pollutant and throw it back to wadi (valley) where water is restored gradually to the ground water underneath the whole city 

My question here , can we achieve the credit through this approach , if not , how would buildings within dense cities achieve this credit through LID and GI ?