A comparison between the fixed schedule of planned expansion of water supply sources and an alternative expansion program based on a short‐term decision from monitoring reservoir levels, water use, and streamflows and employing water reuse capacity and new source development is simulated for the Colorado Springs, Colorado, municipal water system. For this complex, fast growing system with supply based on streamflows and some current reuse capacity the alternative plan postpones major new development an average of 14 years at a cost at present value of half the original planned expansio
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