Rainwater harvesting is the collection and storage of rain water rather than allowing it to run off. Rainwater is collected from a roof like surface and redirected to a deep pit or a reservoir with percolation so that it seeps down and restores the ground water. Dew and fog can also be collected with nets and other tools. Rainwater harvesting differs from storm water harvesting as the runoff is collected from roofs rather than creeks and drains or roads and any other land surfaces. Its agricultural uses include use for livestock and irrigation. It can be used domestically for watering gardens or personal use with proper treatment and domestic heating. The harvested water can also be committed to longer term storage or groundwater recharge. Rainwater harvesting is one of the simplest and oldest methods of self supply of water for households. Residential and household scale projects are usually financed by the user. However larger systems for schools and hospitals or any other facility can run up costs which can only be financed by owners of organizations and governmental units. In urban areas agriculture rainwater harvesting reduces the impact of runoff water and flooding. Rainwater harvesting in conjunction with urban agriculture would be a viable way to help meet the United Nations Sustainable Development Goals for cleaner and sustainable cities. It will also provide health and wellbeing along with food and water security. The technology is available however it needs to be re modelled in order to use water more efficiently especially in an urban setting. Kenya has already been successfully harvesting rainwater for toilets and laundry as well as irrigation. Since the establishment of the country Kenya has prioritized the regulation of their agriculture industry. Additionally areas in Australia use harvested rainwater for cooking and drinking. Studies done by Stout researching the feasibility in India found that Rain water harvesting was most beneficial if used for small scale irrigation which provides income with the sales of produce and the overflow can be used for groundwater recharge. Five Caribbean countries have shown that the capture and storage of rainwater runoff for later use is able to significantly reduce the risk of losing some of the harvest of the year because of soil or water scarcity. In addition the risks associated with flooding and soil erosion during high rainfall seasons would decrease. Small farmers and especially those farming on hillsides could benefit the most from rainwater harvesting because they are able to capture runoff water and decrease the effects of soil erosion. Many countries especially those with arid environments use rainwater harvesting as a cheap and reliable source of clean water. To enhance irrigation in arid environments ridges of soil are constructed to trap and prevent rainwater from running down hills and slopes. Even in periods of low rainfall enough water is collected for crops to grow.Water can be collected from roofs or dams and ponds can be constructed to hold large quantities of rainwater so that even on days when little to no rainfall occurs enough is available to irrigate crops. Rainwater harvesting provides the independent water supply during regional water restrictions. It provides water when a drought occurs. It can help mitigate flooding of low lying areas and reduce demand on wells which may enable groundwater levels to be sustained.