本文介绍了生产成本法，并举例说明如何将其用于节水项目或替代供水的评估。生产成本模型是评估供需双方备选方案的有用工具。该模型计算生产供水以满足预测负荷所产生的成本。传统资源和替代资源之间的比较可以通过根据公用事业公司的独特情况定制的生产成本模型来完成。最后，在情景规划中使用生产成本模型有助于解决未来的不确定性。 对各种情景的生产成本计算结果进行比较，对于制定可靠的水资源利用计划很有价值。本文描述了生产成本计算的计划过程，详细概述了生产成本模型所包含的内容，并给出了一个演示如何使用生产成本模型的简化示例。许多表格显示了在各种条件下的七年简化生产成本模型。

This paper introduces production costing and illustrates how it can be used in the evaluation of water conservation projects or alternative supplies. Production cost models are useful tools to evaluate supply- and demand-side alternatives. The model calculates the costs incurred in producing a water supply to meet forecasted loads. Comparisons between conventional and alternative resources can be completed with the aid of a production cost model tailored to a utility's unique situation. Finally, the use of a production cost model for scenario planning helps to address uncertainty about the future. Comparisons of production costing results for the scenarios are valuable in the creation of robust water utility plans. This paper covers a description of the planning process for production costing, a detailed outline of what a production cost model contains, and a simplified example that demonstrates how a production cost model can be used. A number of tables show a seven-year simplified production costing model under various conditions.