水务设施的短期收入取决于用水的变量。由于对未来一年和两年收入的预测对预算和规划很重要，华盛顿郊区卫生委员会（WSSC）开发了一个计算机化模型，该模型包含了一系列变量，如天气条件和水分不足。WSSC目前正在使用该模型估算收入预测的上限和下限，并评估利率结构或水平变化对收入的影响。 包括11个参考文献、表格、图表。

Short-term revenues for water utilities depend on variables in water use. Since forecasts of revenue for one and two years in the future are important for budgeting and planning, the Washington Suburban Sanitary Commission (WSSC) developed a computerized model that incorporates a series of variables such as weather conditions and moisture deficits. The model is being used currently by the WSSC to obtain estimates of upper and lower limits on revenue fore- casts and to assess the impact of changes in the structure or level of rates on revenues. Includes 11 references, tables, figures.