1991年6月，面对不断加剧的干旱和不断上涨的批发水费，欧文牧场水区（IRWD）实施了一项积极的、不断上升的计划 块速率结构。流程、理念、对客户的影响 用水行为、机构收入和客户满意度见 这篇论文。包括表格、数字。

In June of 1991, faced with deepening drought and increasing wholesale water charges, the Irvine Ranch Water District (IRWD) implemented an aggressive, ascending block rate structure. The process, the philosophy, the impact on customer water use behavior, the agency revenues and customer satisfaction are described in this paper. Includes tables, figures.