引水调控措施是改善太湖流域区域性水环境的应急措施，多年试验研究成果证明了引水措施的有效性。由于调水工程的复杂性以及受到诸多不确定性因素的影响，引水调控措施在改善区域水环境的同时，也会对引水沿线周边区域水环境带来一定的影响，尤其是望虞河西部区域，河网水流受阻，存在武锡澄虞河网区污水滞留或向其他地方转移的风险。针对4个引排水方案，分析了引水对河网水动力条件的变化，比较了引水对望虞河西部河网地区水质影响，分析了河网河道污水滞流时间、强度及迁移长度，评价了污水滞留风险，提出了相应的应急对策。

Water diversion and regulation is an emergency measure to improve the water quality of local Taihu Lake. The effectiveness of the measure is proved through experiences and studies for years. Because of the complexity of water diversion works and some impacts of uncertainties, the diversion project may bring some impacts on water environment along the diversion channel while it improving some local water environment. Especially in the rivers west of Wangyu River, some flows are blocked off. So the risks of the retention and transfer of pollutions in the Wu Xi Cheng Yu Rivers will rise up. According to the four drainage programs, by analysis of the hydrodynamics change and impact comparison of diversion project on water quality change in the west of Wangyu River, the retention time, intensity and transfer scope, and the risk of the polluted water were assessed and the corresponding emergency measures were proposed.