rudwan, Hussein; mengistie, Bezatu Major Advisor (PhD); baraki, Negga Co Advisor Mr.
(Haramaya university, 2018-11)
Background; - In 2015, the WHO/UNICEF Joint Monitoring Program me (JMP) estimated that
660 million people still do not have access to improved drinking-water sources, and over 2.4
billion people do not have access to ...