盐湖城的干旱周期始于1999年，持续到2004年。1999年，上加利福尼亚州的储量 水库被拉下以提供饮用水。预计径流 在可预见的未来某个时候会再次发生，并将其填满。接下来的四个 多年来，径流的影响不大。这项决定是在2000年做出的 尽量少使用Parleys处理厂，并从附近的公用事业公司购买水 有更多的存储空间。下游水库的流量从 每年20000英亩到5000英亩以下。上水库直到 在经历了严冬之后的2005年春天。没有水被释放，而且 2000年至2004年间，从下水库得到的处理很少。 非常小 从上到下的储层进行释放，以提供 2000年至2004年期间治疗绝对必要。下水库成了一座水库 基本上是封闭的系统，2002年开始出现水质问题。2002年10月下旬，Parleys处理厂被要求在污水处理后生产水 离开大约九个月。原水中的藻类数量很高 约为202000000/100L。主要生物为巨细胞卵母细胞。虽然 这种微生物不是味觉和气味的问题，它形成了一层黏液涂层，这使它非常容易被感染 在处理过程中难以凝结和去除。良好的絮状物似乎形成了 很好。然后，絮体在沉淀池中破碎，形成不可过滤的水 结果是。 最终，60 mg/L的三氯化铁产生了一种可沉降的 可过滤絮体。处理厂的正常剂量为5-10 mg/L。这起事件 促使人们更仔细地观察水库水质的变化 在干旱期间。总的来说，随着水库年流量的增加，溶解氧减少，TDS增加 数量减少。本文讨论了改进 由于2004年夏天采取的措施。包括数字。

A drought cycle began in Salt Lake City in 1999 and persisted through 2004. In 1999, the reserves in the Upper Reservoir were drawn down to provide drinking water. It was anticipated that runoff would happen again sometime in the foreseeable future and fill it back up. The next four years did not see much in the way of runoff. The decision was made in 2000 to minimally utilize Parleys Treatment Plant and purchase water from neighboring utilities that had more storage. The flow through volumes in the Lower Reservoir went from 20,000 acre-ft to less than 5,000 acre-ft annually. The Upper Reservoir did not fill until the spring of 2005 after a heavy winter. No water was released and very little was treated from the Lower Reservoir during 2000 through 2004. Very small releases were made from the Upper to the Lower Reservoir to provide what was absolutely necessary for treatment during 2000 to 2004. The Lower Reservoir became an essentially closed system, and water quality problems started to occur in 2002. In late October of 2002 Parleys Treatment Plant was called upon to produce water after being off for about nine months. The algae counts in the raw water were about 202,000,000/100L. The predominant organism was Oocystus Gigal. While this organism is not a taste and odor problem, it forms a slime coating which made it very difficult to coagulate and remove in the treatment process. Good floc appeared to form just fine. Then the floc broke up across the sedimentation basin, and unfilterable water resulted at the end. Eventually, 60 mg/L of ferric chloride produced a settleable and filterable floc. The normal dose for the treatment plant was 5-10 mg/L. This incident prompted a closer look at what had been happening to water quality on the reservoir during the drought. In general, DO decreased and TDS increased as the reservoir annual flow through amounts decreased. This paper discusses improvements due to measures that were taken during the summer of 2004. Includes figures.