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Investment Cost per personRyesgade (Cancelled)11.962Baldersgade 20-22 (Cancelled)Nordhavnsgården2.1282.500Afd. 47 Virklund6.333LEV huset10.500Afd. 42 Virklund7.000Folehaven569Hedehusene-- 2.000 4.000 6.000 8.000 10.000 12.000 14.000Investment Cost (DKK/person)Figure A: Investment Unit CostsFurthermore, the payback time has been estimated for the treatment systemsfor which information about investment costs, water savings and operatingcosts were available. The estimated payback time periods appear from figureB.Estimated Payback TimeRyesgade (Cancelled)78Baldersgade 20-22 (Cancelled)26Nordhavnsgården12Afd. 47 Virklund47LEV huset63Afd. 42 Virklund270 10 20 30 40 50 60 70 80 90Payback Time (Years)Figure B: Payback PeriodFigure C gives a summary of the produced greywater quantity per person perday. The average is estimated at 31 l/p×d (except for Folehaven, which onlyreuses wash water from washing machines at a common laundry). By comparison,the average consumption for toilet flushing for a normal householdwas 35.4 l/p×d in the year of 2000.15