The walk that brings clean water Walk or run 6 km during World Water Week (23/29 August) to bring clean water to vulnerable children. Why 6K? Thats the average distance people (usually girls) in the developing world, walk every single day to collect water - thats often dirty. To take part, simply donate or set up your team to walk or race together with friends and family. By walking or running 6K and raising money doing it you can help vulnerable children and their communities have safe clean water for life.