Abstract
We estimated domestic water consumption and sewerage discharge in each standard grid cell across the 44 municipalities in the Lake Kasumigaura watershed for 1995. Domestic water consumption ranged from-792 to +2, 354m3/d; sewerage discharge ranged from-765 to +1, 949 m3/d between the method in case that only nighttime population was considered and that both nighttime and daytime population was considered. Consideration of the daytime population was important in accurately modeling the hydrological cycle in the watershed.
