In some countries that have high rainfall, ironically, drought continues to occur in various regions. It is unfortunate, considering there are ways that can be done with such high rainfall. Water Harvesting is an appropriate way to collect water by collecting it from rainwater that is used for agricultural production as well as for other domestic needs. Water harvesting is the act of collecting rainwater and surface runoff to be channeled to temporary and / or permanent shelters which can be used at any time to irrigate the cultivated plants when needed. Water harvesting technology in addition to functioning to provide a source of irrigation water in the dry season can also function to reduce flooding in the rainy season. Rainwater harvesting and surface runoff are addressed to
(1) reduce the volume of surface runoff and increase groundwater reserves;
(2) increasing the availability of plant water, especially in the dry season; and
(3) reduce the surface flow velocity so that the erosion and carrying capacity decreases.
Water harvesting can be done on a micro or macro scale. Macro-scale for example is making dams that are used by many people. While the micro scale can be done and utilized by a small group of people or usually one family in one house. In its use for agricultural production, water harvesting has several advantages including:
• Increase production
• One of the soil conservation efforts
• In Arid climates, water harvesting can reduce salt levels
• One of the efforts to conserve water
• Filling up ground water so that it can be used as spare parts during the dry season or when drought occurs
However, water harvesting also has limitations when applied, such as:
• Water harvesting is very much influenced by climate, so the quality and
quantity are not stable.
• Because it is still relatively new, there are still many inexperienced
• Risk of creating conflict, either between communities or with the government.