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016 -21 <br />PROPOSED TOILET REPLACEMENT PROGRAM <br />Ultra Low Flush Toilet (ULFT) Payback Period Calculations <br />Assumptions: <br />Single Family <br />Multiple Family <br />Cost of Each Direct Install ULFT <br />$175.00 <br />$300.00 <br />Cost of water from SFPUC ($ /Ccf - or unit) <br />$1.10 <br />$1.10 <br />Cost of water from SFPUC ($ /Acre Foot) <br />$479 <br />$479 <br />Water saved to break even (Ccf) <br />159 <br />273 <br />Water saved to break even (gallons) <br />119,000 <br />204,000 <br />ULFT Water Savings Per Home (gals per day)' <br />43.3 <br />43.8) <br />Toilets per Home <br />2.0 <br />1.21 <br />Water Savings Per ULFT (gpd) <br />21.65 <br />36 <br />Days needed to break even <br />5,497 <br />5,589 <br />Years needed to break even <br />15.1 <br />15.3 <br />'Water savings from MOU Exhibit 6, Tables 1 and 2. <br />Payback periods do not factor in natural replacement or freerider issues into estimates. <br />Cost of water from SFPUC is taken as avoided cost for water. In drought years avoided cost will <br />be much higher. <br />Revised 6/23/2003 <br />