Study on several important problems about urban flood-control construction of Changsha city
长沙市防洪建设中若干重要问题探讨

Seveal problems about urban flood control construction of Changsha city, akey important flood control city in China, are studied These issues include the establishment of flood control standard, flood level designing and height determination of floodwalls; construction policy and program; entire flood control power construction; harmonious development among flood control installations construction, infrastructure construction and urban landscape construction,etc The designed flood recurrence interval (flood control standard) in Changsha city is 100a The establishment of flood level designing should take the following aspects into consideration: high standard floods in Xiangjiang River flowing through Changsha city and its branches as well as Dongting Lake have never met with each other nor the occurrence of the same frequency flood; relation is not the major evidence of flood design;and the amplitude of setup of flood of the South Dongting Lake is a unsteady influencing factor and the reduction of channel storage is a steady influencing factor of flood level in Changsha city Flood control levee altitude is higher than the real demand of Changsha city,which reduces the levee steadiness, and causes ineffective investment and influence on the urban landscape The flood control projects must be constructed step by step,firstly excluding the dangerous factors and then reinforcing levee and therefore improving the entire flood control power, also be harmonized relations with the construction of urban infrastructure and the construction of urban landscape