Download these technical notes directly from the website: These four-page illustrated notes, originally prepared in 2011 and updated in 2013, provide practical, evidence-based recommendations in responding to immediate and medium-term water, sanitation and hygiene needs of populations affected by emergencies. The notes are relevant to a wide range or emergency situations, including both natural and conflict-induced disasters. They are suitable for field technicians, engineers and hygiene promotors, as well as staff from agency headquarters.