There has been a large body of work focused on the development of Life Cycle Assessment and Life Cycle Assessment methodologies to assess the level of environmental impacts and the money that can be saved by implementing rainwater harvesting systems. More development and knowledge is required to understand the benefits that rainwater harvesting can provide to agriculture. Many countries, especially those with an arid environment, use rainwater harvesting as a cheap and reliable source of clean water. To improve irrigation in arid environments, soil ridges are built in order to trap and prevent rainwater from running down hills and slopes. Even in periods of low precipitation, enough water is collected to grow crops.  Water can be collected from roofs, dams and ponds can be built to maintain large amounts of rainwater so that even on days where there is little or no rainfall, there is enough available to irrigate crops.