Benefits of Rainwater Utilization- The Applications on Flood Mitigation, Water Harvesting and Gutter Snipe Design

In order to achieve the purposes of environmental protection, such as flood control, sustainable development on water utilization and increasing of water demand with the decreasing of conservative water resources, to find new supplementary water resources and effective utilization those resource becomes a very significant topic. Rainwater, which is caught by reservoir at upstream while flowing down into sea through the middle or downstream, a best blessed gift and it has no water right problem without falling down the ground. Considering from the view point of environmental, economic, and social impacts, the utilization on water harvesting and flood mitigation with the benefit-cost ratio analysis and the effective function of gutter snipe design keeping water clean evoke us to study in paying much attention. In this study, high B/C ratio and wide application are presented.