non Dew fog nets roofs tanks years India reuse Scale rivers Canada Simple drains regions streams heating Quality Drought surfaces Industry flooding cisterns drinking safe use thousands deep pits livestock Advantages irrigation industries popularity Other Uses households other tools Limitations institutions Applications domestic use neighborhoods Effectiveness runoff impact local climate other sources United States water scarcity United Kingdom Ancient Method storage systems various purposes various cultures Proper treatment household chores potable purposes Country Examples Growing interest several benefits rainfall patterns long-term savings urban agriculture modern adaptations groundwater levels longer-term storage Harvested rainwater Initial setup costs Traditional practice sustainable approach sustainability goals Allegiance Enterprise Rain Water Harvesting Environmental Benefits Geographic Variability alternative water source Independent Water Supply Allegiance Water Management Rooftop rainwater harvesting residential rainwater systems