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{{Language-box|english_link=Water Portal / Rainwater Harvesting / In situ rainwater harvesting | french_link=La collecte des eaux de pluie in situ | spanish_link=Captación de agua de lluvia in situ | hindi_link=वाटर पोर्टल / वर्षाजल संचयन / यथास्थान वर्षाजल संचयन | malayalam_link=Coming soon|tamil_link=Coming soon | korean_link=Coming soon | chinese_link=原地集雨 | indonesian_link=Panen Air Hujan / Panen Air Hujan Langsung in Situ | japanese_link=In situ雨水貯留}}

In arid and semi-arid regions, where precipitation is low or infrequent during the dry season, it is necessary to store the maximum amount of rainwater during the wet season for use at a later time, especially for agricultural and domestic water supply. One of the methods frequently used in rainwater harvesting is the storage of rainwater '''in situ'''. Topographically low areas are ideal sites for in situ harvesting of rainfall. This technique has been used in the arid and semi-arid regions of northeastern Brazil, Argentina, and Paraguay, primarily for irrigation purposes. The in situ technology consists of making storage available in areas where the water is going to be utilized.