随着我国经济产业结构的不停调整，很多新的经济开发区也已经或开始建立。城市的规模发展不断壮大，直接给供排水的管网建设带来了十分严峻的挑战。虽然这些年来建设水平也在不断的提高，但其中仍然存在着很多问题。%With the constant adjustment of Chinese economy industrial structure, a lot of new economic development zones have been established or started. With the development of city scale, this directly brought a very serious chal enge to the con-struction of water supply and drainage pipe network. Although the building level has been improved in these years, there stil exist many problems.
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