# Design Criteria for Planning the Agricultural Rainwater Harvesting Systems: A Review
## 3 Discussion
Additionally, there are reported cases of water collection from roofs of houses to supply communities, where economic aspects are evaluated considering the possible benefits and socioeconomic characteristics of the population [59]. Remote sensing, precipitation, and water balance are also used to locate areas where domestic water collection could be done for domestic drinking water demand (drinking and cooking) or like domestic demands (drinking, cooking, and hygiene needs) [68]. In addition to domestic use, this system has been implemented for family gardens, which can be a food base for the house dwellers and even serve as an economic support, where climatic conditions, material, and roof area influence the evaluation of this methodology for rainwater use [63]. In short, the use of GIS, remote sensing, and hierarchical weighting and multicriteria analysis are important to facilitate decision making for government entities, since through them, runoff capacity is determined, planned, and evaluated for the potential use of rainwater in an area [56], even allowing the creation of computer programs with which to determine the size of reservoirs and the geometry that they should have, while also taking into account the sizes of the field and the cultivation system implemented by the farmer along with an evapotranspiration model [58]. Regarding the micro-basins (group 2), the main advantage lies in being used for crops, being the collection of water \"in situ\", that is, done in the same field where the plantation is made, either within the area where the plant is located or with an impluvium area that serves as a basin and is subsequently stored close to the cultivation area. Among the disadvantages, it is found that in several cases supplementary irrigation is required, such as for instance in Kharagpur, India, where the benefits of supplementary irrigation were studied in relation to the productivity and an economic analysis of profitability was made to evaluate rice production [114]. In Group 2, it is important to consider the characteristics of the soil because it is associated with agricultural productivity, which is necessary for this type of water use. Regarding the disadvantages, the types of catchment structures involved in this group cannot be used for domestic or other uses, since there is no reservoir for water storage. Micro-basins can be used in small farms requiring water for the subsistence of their crops (e.g., rice); however, they must be supported in the supplementary irrigation, which allows savings regarding the amount of water required for cultivation [72]. Similar to Group 1, in this group, the locations of hydraulic structures for collecting rainwater for agricultural uses involving topographic data, soils, vegetation, hydrology and meteorology, can be established through using GIS and satellite images (before and after the rain) [73; 78; 82]. On the other hand, [PERSON] et al. [75] use GIS incorporating socioeconomic aspects and criteria such as slope, depth, texture, and soil stoniness, while [PERSON] et al. [76] also use field inspection to locate the ideal sites through criteria weighting and analytical hierarchy process. They can be refined by making the assessment at the basin level but giving emphasis at the sub-basin level and over time to understand the hydrological processes occurring in the RWHS by simulating water balance, allowing options for optimization [86]. In other cases, the aim is to determine the efficiency of rainwater harvesting systems through experimentation and using satellite images for the large-scale planning of water resources in the territory, focusing on olive crops and engaging with the stakeholders in the study area [74]. In the same way, micro-basins allow monitoring the balance of water and sediments [78], as well as runoff behavior, sedimentation, and soil moisture [79], demonstrating in these aspects the type and depth of soil influence, tillage, and the management by the farmer [82].