drainage area

Three mains have since been added, giving the city water from a drainage area of seventy-four square miles.

The greater part of the country belongs, however, to the drainage area of the Congo river.

The whole of the hill country north of Asmara belongs to the drainage area of the Baraka or Anseba.

About 63% of the area lies in the basin of the Mekong river and 37% in the Salween drainage area.

Therefore the figure 11.74 represents a conservative mean for a calculation of total amount of water over the drainage area.