This paper reports on a preliminary study for improvement of a lake with springs in an urban area. Water balance, water quality and bottom sediment were examined. The flow rate was measured at 25 sample sites around the lake from Dec. 1991 to Nov. 1992. The water flow rate was ca. 520000m3/d during the experimental period and the spring rate about 90%. The water quality in this area is dependent on the springs. It is marked by a heigh concentration of No3-N and Po4-P. The amount of bottom sediment was ca. 10000m3 in KE-lake. The physical and chemical properties were simillar to Andosol.
