Dry excavation is a vital dredging method to improve the surface water environment quality of ditches in the Nanhan embankment.In order to investigate the effect of the surface water environment quality,water environmental capacity,and the eutrophication index of water by dry excavation dredging.Taking the ditches in Nanhan embankment as the research object,the water sample,water environment capacity,and eutrophication evaluation results of the ditches before and after dredging were analyzed and discussed.The result shows:1)The surface water qu...