1) The document discusses the potential for implementing a water transportation system connecting the Hatirjheel, Gulshan, Banani, and Baridhara lakes in Dhaka, Bangladesh.
2) It provides background on the Hatirjheel project which revived one of the lakes, and argues water transportation could provide a cheap public transit option while reducing environmental impacts.
3) However, challenges include coordinating different agencies, managing waste disposal, and potential negative effects on water quality and wildlife from increased usage. The document analyzes this proposal's costs and benefits.