Future sea level rise can also overload the normal protective function of coastal water projects, such as protective dikes and drainage sluiceways capacity. An estimation of the drainage variations of Sheyang River sluice wal due to sea level rise shows that sea level rise reduces drainage capacity and avialable drainage time. A 50 cm rise of sea level can cause a drainage decrease of 20% - 30% through the Sheyang River sluiceway pertide period; a 100 cm rise can decrease the drainage from 40% to 50%, and a150 cm rise can cut down the darinage from 65% to 75%. The reduction of drainage capacity can cause more damage from waterlogging and flooding in the area.

The last part of the paper gives suggestions and countermeasures for coping with the impact of sea level rise on coastal wafer projects of Jiangsu Province.