这篇文章描述了俄勒冈州波特兰市波特兰水务局采用的延长寿命的方法，以增加旧露天水库以及各种有盖蓄水设施的使用年限。目前正在执行例行清洁、维护和保护程序。在春季和秋季，开放式储液罐每六个月进行一次清洁，而钢制储液罐则进行检查，必要时重新喷漆，并每年进行维修。为了保护露天水库免受破坏，波特兰依靠闭路电视监控。包括数字。

This article describes life-prolonging methods employed by the Portland Water Board in Portland, Oregon to add additional years of service to old open storage reservoirs as well as a variety of covered storage facilities. A routine cleaning, maintenance, and protective program is currently functioning. Open reservoirs are cleaned every six months in the spring and fall, while steel reservoirs are inspected, repainted if necessary, and repaired annually. In order to protect open reservoirs from vandalism, Portland relies on closed-circuit television surveillance. Includes figures.