According to International Institute for Environment and Development Report in 2013, one of the most significant challenge of contemporary developing urbanisation is water shortage which is due to unbalance distribution of the precipitation and the high density of population.This proposal points out the most important challenge is the water shortage in the tropical developing city.

In the global viewpoint, the climate changing leads to the rising of the sea level and it also aggravates the serious flooding occurring in the coastal city.

Semarang City has been sufering from the coastal erosion yearly. Because of economic concern, the local government refuses to reinforce the infrastructure in the weakened site.

To ind out the fact of the water risk, this project scopes the overview of the water system in the Semarang Ar ea. The strategy is not only recovering the waterfront to the coastline, but also designing from the top- down policies and buttom-up ideas. The main goal is upgrading the water quality and quantity.

G.R.A.B.( Guard, Recycle, Active, Balance ) is the guideline in this proposal. Looking towards water  management  as  both ecological and economical strategies, G.R.A.B. will utilise the means of managing wasted water, recharging groundwater, making good use of water and prevent the floods.

On the other hand, the site survey discover ed the mobile life style nowadays. The “Grab” mobile phone application inspires the concept of individual economics and mobility. The project combines the water selling and resource acquiring with the e-business platform. And that could have the residents free from the barrier to make profit from daily water storage and management.

The project devotes to prompting the water quality. In each key plots of the metropolis, the concept arranges essential strategies so that the coastal downtown could gain the safety water resource. In the educational concern, the residents realise the importance of the whole circulation by approaching the waterscape as a public space.