In Brazil, water management in agriculture is an extremely important issue in terms of water security, as well as in other regions of the world. Thus, the study presents a method to measure the potential water demand in the agricultural sector in two pairs (Pair 1 and Pair 2) of hydrographic sub-basins (SB) inserted in the Piracicaba River basin, located in southeastern Brazil. The methods adopted consisted of: using orbital sensor data to identify the types of temporary and permanent crops in the studied areas; preparing the Normalized Difference Vegetation Index to classify temporary crops, in four levels, which represent their development stages; collecting the irrigation need for each permanent and temporary crop through the “Technical Coefficients for Irrigated Agriculture” platform under the control of the National Water Agency; and, calculating the daily Potential Water Demand in the agricultural sector. The potential water demand showed differences between the pairs of the hydrographic sub-basins, due to the extension and the type of the predominant cultures. It is noteworthy that the Córrego dos Coqueiros hydrographic sub-basin is an area where the water supply may be compromised, due to the use of water resources in several sectors, in addition to agriculture. The need for crop irrigation, obtained through the National Water Agency platform associated with the geoprocessing of satellite images, made it possible to measure the daily potential water demand on the hydrographic sub-basin scale, which can assist in the assessment of the hydrographic region and the formulation of measures aimed at the sustainable use of water resources.

在巴西以及世界其他地区，农业用水管理是水安全方面的一个极其重要的问题。因此，该研究提出了一种方法，用于测量插入位于巴西东南部皮拉西卡巴河流域的两对（一对 1 和一对 2）水文子流域 (SB) 中农业部门的潜在用水需求。所采用的方法包括：使用轨道传感器数据来识别研究区域内临时和永久作物的类型；准备归一化差异植被指数，将临时作物分为四个级别，代表它们的发育阶段；通过国家水务局控制下的“灌溉农业技术系数”平台收集每种永久和临时作物的灌溉需求；和，计算农业部门的每日潜在需水量。由于主要文化的延伸和类型，潜在的需水量显示出水文子流域对之间的差异。值得注意的是，Córrego dos Coqueiros 水文分流域是一个供水可能受到影响的地区，因为除农业外，还有多个部门使用水资源。通过与卫星图像地理处理相关的国家水务局平台获得的作物灌溉需求使得可以测量水文子流域尺度上的每日潜在需水量，这有助于评估水文区域和制定旨在可持续利用水资源的措施。