Vietnam grapples with drought along the Mekong delta
· The Ca Mau peninsula, in southernmost Vietnam, is not connected to the Mekong''s watershed, so is much more saline than the rest of the delta. "In 2009, a strategic environment assessment that I worked on found that each dam on the mainstream has a retention time of about three days for the smallest, to 18 days for the biggest," Thien said ...