21.  He said walk-up flats at present depended on natural water pressure and were not equipped with pumps.

22.  It has constructed its own reservoirs to trap rain water without disturbing natural water resources.

23.  Keizrul said if the wetlands filtering proved successful, the concept would be promoted to other areas of development for effective natural water treatment.

24.  Lake George, along with Lake Champlain to the north, forms a natural water route linking Canada with the upper Hudson River.

25.  Some have natural water sources, and the temperature inside stays almost constant, making them somewhat of a haven in the Afghan winters.

26.  The studies prove that the government-managed dams need to provide more natural water flows, scientists say.

27.  Environmentalists blamed uncontrolled development of green spaces and of natural water catchment areas, along with broken or refuse-choked drains, for the extent of the disaster.

28.  Environmentalists have blamed the floods on the uncontrolled development of green spaces and natural water catchment areas, along with broken or blocked drains.

29.  Environmentalists have blamed the uncontrolled development of green spaces and natural water catchment areas, inadequate flood prevention projects and broken or blocked drains.

30.  Environmentalists blamed uncontrolled development of green spaces and of natural water catchment areas, along with broken or refuse-choked drains, for the deluge.