This is the inquiry on the BBC World Service with me, Kavita Puri.

Each week, one question, four expert witnesses and an answer.

A group of women are standing around a community water pump on a street in Jakarta, the capital of Indonesia.

A mother crouches down, supporting her naked infant. She washes his body. He

wriggles but she has little option. It's the only place she can get clean

water. This mother, like nearly half the city, doesn't get

piped water into her home. She relies on these community pumps to bring it

all the way from the ground. But as the water is sucked out,

the city above, the land and buildings are sinking and fast

Some by up to 25 centimeters a year and as the city gets lower flooding is getting worse

The situation is so bad the government's announced it wants to build a whole new capital, an ambitious and costly endeavor. It would mean transferring the seats of government, judiciary and central bank to another place altogether.

That's even before you've thought of whether the new capital has the infrastructure, housing, industry and

transport links to the rest of the country.

So this week we ask, how do you move a capital city?

Part 1, the Master plan. I first visited Brasilia in 1985 and I absolutely fell in love with the poetry and

grandeur of Brasilia.

Although I have to say it was very difficult to love Brasilia in those days.

This is architect Thomas Decker. He worked in the capital of Brazil, Brasilia, for many years.

Until the 1950s, Rio de Janeiro was Brazil's capital, but... It was felt at the time that it suffered

from the corruption of what they called the luxury and pleasure of the beaches.

And they felt... the luxury and pleasure of the beaches.

And they felt the very easy and relaxed way of life

...