Abstract Water reclamation and reuse represent a promising approach to mitigate water related use conflicts especially in the agricultural sector where challenges with regard to water management are increasingly exacerbated by the effects of climate change. However, for the conceptualization and implementation of non-potable water reuse projects for agricultural purposes a comprehensive understanding of the irrigation requirements is required. But this information is frequently not readily available. Within the scope of this study modelling based on the approach implemented within the CROPWAT 8.0 software was applied in order to determine the irrigation requirements for an agricultural area in Gochsheim, Lower Franconia (Germany) since locally recorded data were missing, inconsistent or incomplete. The model was validated not only by available locally recorded groundwater extraction rates for agricultural irrigation purposes but also by comparison with findings from the literature. Based thereon, the annual and daily crop specific net irrigation requirements of ten commonly cultivated crops were computed – those comprised celery, lettuce, onions, potatoes, cabbage and others. The crops showed crop-specific typical annual as well as daily net irrigation requirements, e.g. celery with an annual and daily demand of 228–602 mm and 5–20 mm, respectively. Particularly important for the planning of a water reuse project was the determination of the overall daily peak gross irrigation requirement. The modelling approach revealed a value of 14.3 mm/day for this area, which represents the technically as well as economically most feasible benchmark, and a good approximation to the historical recorded overall daily peak gross irrigation demand.

中文翻译：

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估算非饮用水回用项目规划中的农业灌溉需求

摘要 水的回收和再利用是缓解与水相关的使用冲突的一种很有前景的方法，特别是在农业部门，气候变化的影响日益加剧了水资源管理方面的挑战。然而，对于用于农业目的的非饮用水再利用项目的概念化和实施，需要全面了解灌溉要求。但这些信息通常不容易获得。在本研究范围内，基于 CROPWAT 8.0 软件中实施的方法进行建模，以确定下弗兰肯（德国）Gochsheim 农业区的灌溉要求，因为当地记录的数据缺失、不一致或不完整。该模型不仅通过当地记录的用于农业灌溉目的的地下水提取率进行了验证，而且还通过与文献中的发现进行了比较来验证。在此基础上，计算出 10 种常见作物的年度和每日作物特定净灌溉需求 - 包括芹菜、生菜、洋葱、土豆、卷心菜等。作物表现出特定作物的典型年度和每日净灌溉需求，例如芹菜的年度和每日需求分别为 228-602 毫米和 5-20 毫米。对于水回用项目的规划而言，特别重要的是确定总体每日高峰总灌溉需求。建模方法显示该区域的值为 14.3 毫米/天，这代表了技术和经济上最可行的基准，