 In the future DWASA plans massive investment to replace dwindling groundwater resources with treated surface water from less polluted rivers located up to 160 km from the city.In 2011 Bangladesh's capital development authority, Rajdhani Unnayan Kartripakkha, made rainwater harvesting for new houses mandatory in an effort to address water scarcity and reduce flooding.The first piped drinking water system in Dhaka was established in 1874 by Khwaja Abdul Ghani, the aristocrat that ruled Dhaka under the British colonial authorities.