Chula Vista市正处于快速增长的门槛，大量住宅开发计划正在酝酿中，以满足对额外住房的预期需求。预计到2020年，该市将新增1万套住房。由于丘拉维斯塔市90%以上的供水来自其他流域，规划者认为有必要在技术和经济上尽可能多地将节水功能纳入新住宅。对14个具体的节水方案、其特点、成本、效益以及施工阶段实施的可行性进行了经济分析。 这14个选项超出了联邦、州或当地现行法规已经规定的选项，如超低冲水马桶（ULFTs）、低流量淋浴头等。这14个评估选项包括节水景观、旱生景观、景观灌溉蒸发蒸腾控制器、高效洗衣机、热水管道隔热、，节水洗碗机、热水需求装置、双冲水马桶、减压阀、景观灌溉循环水的使用，以及现场水重复使用的灰水系统。每种方案的典型节水数据都是从一台机组（每台机组）的文献中获得的- （居住）每年一次。成本来自系统制造商、制造商和供应商。计算了每个保护方案生命周期内节水的现值，以及购买和运营、维护和管理成本。根据这些分析，计算了效益成本比，以便对各种用水效率方案进行并排比较。本研究中使用的过程可以为鼓励新开发项目未来持续用水效率提供合理依据。它还可以作为其他社区的一个榜样，希望在为自己日益增长的住房需求建造的新住宅中建造节水方案。 包括表格、数字。

The City of Chula Vista is poised at the threshold of a growth spurt, with a large number of residential development proposals in the pipeline, to meet the expected demand for additional housing. It is projected that by 2020, an additional 10,000 housing units will be built in the City. Since over 90 percent of the City of Chula Vista's water supplies are imported from other basins, planners saw the need for incorporating as much water conserving features into new homes as technically and economically feasible. An economic analysis was conducted comparing 14 specific water conservation options, their characteristics, costs, benefits, and feasibility of implementation during the construction stage. The 14 options are above and beyond those already mandated either by federal, state, or local regulations in effect, such as ultra low flush toilets (ULFTs), low-flow showerheads, etc. The 14 evaluated options included water-efficient landscapes, xeriscape, evapotranspiration controllers for landscape irrigation, high-efficiency clothes washers, hot-water pipe insulation, water- efficient dishwashers, hot-water demand units, dual-flush toilets, pressure-reducing valves, use of recycled water for landscape irrigation, and use of gray water systems for onsite water reuse. Typical water savings data for each of these options were obtained from the literature on a unit (per-residence) annual basis. Costs were obtained from manufacturers, builders, and suppliers of systems. Present-worth value of the water savings over the life-cycle of each conservation option was calculated, as was cost of purchase and operation, maintenance, and administration. From these analyses, benefit-cost ratios were calculated for side-by-side comparison of a diverse range of water-use- efficiency options. The process used in this study can provide a rational basis for encouraging sustained future water use efficiency in new developments. It also can serve as a model for other communities desiring to build water conservation options into new homes built for their own growing housing needs. Includes tables, figures.