建筑给排水文献毕设翻译.doc

英文翻译 院 （系） 环境与市政工程 专业班级 给水排水工程1001班 姓 名 李倩昱 学 号 100320115 指导教师 王 俊 萍 2014年 04月 18日 The effect of rainwater storage tanks on design storms From Urban Water G. Vaes *, J. Berlamont Abstract The effect of source control measures on the design of combined sewer systems can in most cases only be correctly assessed using the intrinsic temporal rainfall variability, because long antecedent periods can have an important influence. A conceptual model was built to assess the effect of rainwater tanks on the rainfall runoff using long term historical rainfall series. The outflow of the rainwater tank model is converted to equivalent rainfall series. Based on intensity/duration /frequency-relationships (IDF-relationships) for this equivalent flattened rainfall, modified design storms are developed. 2001 Elsevier Science Ltd. All rights reserved. Keywords: Design storm; Intensity/duration/frequency-relationships; Rainwater; Source control; Storage tanks 1. Introduction The driving force behind the behaviour of many hydraulic structures and systems is the rainfall input. In order to simplify design calculations and limit simulation time, representative single storm events are often used. In Flanders, standard design storms are used for the design of combined sewer systems, based on intensity/duration/frequency-relationships (IDF-relationships) (Vaes, 1999). These design storms are called `composite storms (Fig. 1), because for one return period all storm durations are included in one storm [comparable with the well-known Chicago-storms (Keifer Chu, 1957)]. However, the variability of the rainfall is high. A comparison between the simulation results (flow, water depth, etc. in hydrologic/hydraulic systems) obtained with continuous simulations and simulations with design storms indicate that significant differences may be found for the probability of an event when the intrinsic variability of the rainfall is neglected (Dahl, Harremoes, Jacobsen, 19