Water reuse via land application is old technology; but the water balance only design approach and practice has not worked well. There are many benefits of water reuse by irrigating crops; however, there are some risks if not designed properly. When the design approach uses a combined water-nutrient-salt balance, the most effective and sustainable, long-term system is achieved. This approach provides a design based on land area requirements, on-site water storage, and economic return from the irrigated crops. The single, most often overlooked step in the water balance is accounting for the water stored in the soil. When spread over large areas, this quantity of water results in considerably less required surface water storage, which saves capital costs. This design approach has been used successfully on multiple sites for over 30 years without failure.

中文翻译：

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中水回用土地应用系统设计

土地利用中水回用是老技术；但仅水平衡的设计方法和实践效果不佳。通过灌溉作物进行水再利用有很多好处；但是，如果设计不当，则存在一些风险。当设计方法使用组合的水-养分-盐平衡时，可实现最有效和可持续的长期系统。这种方法提供了一种基于土地面积要求、现场蓄水和灌溉作物的经济回报的设计。水平衡中最常被忽视的一个步骤是计算土壤中储存的水。当分布在大面积区域时，这种水量导致所需的地表水存储量大大减少，从而节省了资本成本。