
(This Sept. 29 story has been corrected to show rains have failed in the last four rainy seasons, not the last four years in second paragraph)
LODWAR, Kenya (Reuters) - In a dry river bed in Kenya's arid northwest, pastoralists dig ever-deeper pits in an anxious search for water, as the region suffers its worst drought in 40 years, which has wiped out livestock and crops, deepening a hunger crisis.