环境工程专业英语unit6.ppt

Unit 6 Water Supply System 05.11.18 The nature of the water source commonly determines the planning, design, and operation of the collection, purification, transmission, and distribution works. 一般说，水资源的自然状态决定了收集、净化、输送和配水工程的规划、设计和运行。 Profession-related English The two major sources used to supply community and industrial needs are referred to as surface water and groundwater. 为社区和工业需要提供水源，两个重要的来源是地表水和地下水。 Streams, lakes, and rivers are the surface water sources. 溪流、湖泊和河流属于地表水源。 Groundwater sources are those pumped from wells. 地下水是指从井里泵上来的水。 Fig. 2-1 depicts an extension of the water resource system to serve a small community. 图2-1描述了向小区供水的水资源系统范围。 The source in each case determines the type of collection works and the type of treatment works. 水源的具体情况决定了集水工程和处理工程的类型。 The pipe network in the city is called the distribution system. 城市管网叫作配水系统。 The pipes themselves are often referred to as water mains. water mains 给水干管 管道本身常常称作给水干管。 Water in the mains generally is kept at s pressure between 200 and 860 kilopascals (kPa). 干管中的水通常保持着200~860千帕的压力。 Excess water produced by the treatment plant during periods of low demand (usually the nighttime hours) is held in a storage reservoir. 低需水量时期（常常是夜间），水处理厂多生产的水被储存在水库中。 The storage reservoir may be elevated (the ubiquitous water tower), or it may be at ground level. storage reservoir 蓄水池 蓄水池可以是高位的(如普遍使用的水塔),也可以在地下. The stored water is used to meet high demand during the day. 为了满足当日的最大需水量，需要使用这部分储存水。 （As a ）Storage compensates for changes in demand and allows a smaller treatment plant to be built（主句）. 因为有储备水来适应水量供求上的变化，水厂可以建得小一些。 Storage is also used to provide emergency backup in case of a fire. 储备水也被用来提供有火情情况下的紧急水源。 Population and water consumption patterns are the factors that govern the quantity of water required and hence the source and the whole composition of the water resource system. One of the first steps in the selection of suitable water supply source is determining the demand that will be placed on it. T