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29 INDIVIDUAL SUBSURFACE SEWAGE TREATMENT SYSTEMS 7080.1860 7080.1860 DESIGN FLOW (GALLONS PER DAY). TABLE IV Number of bedrooms Classification of dwelling I II III Gallons per day 2 or less 300 225 180 3 450 300 218 4 600 375 256 5 750 450 294 6 900 525 332 * Flows for Classification IV dwellings are 60 percent of the values as determined for Classification I, II, or 111 systems. For more than six bedrooms, the design flow is determined by the following formulas: Classification I: Classification I dwellings are those with more than 800 square feet per bedroom, when the dwelling's total finished floor area is divided by the number of bedrooms, or where more than two of the following water -use appliances are installed or anticipated: clothes washing machine, dishwasher, water conditioning unit, bathtub greater than 40 gallons, garbage disposal, or self-cleaning humidifier in furnace. The design flow for Classification I dwellings is determined by multiplying 150 gallons by the number of bedrooms. Classification II: Classification II dwellings are those with 500 to 800 square feet per bedroom, when the dwelling's total finished floor area is divided by the number of bedrooms, and where no more than two of the water -use appliances listed in Classification I are installed or anticipated. The design flow for Classification II dwellings is determined by adding one to the number of bedrooms and multiplying this result by 75 gallons. Classification 111: Classification 111 dwellings are those with less than 500 square feet per bedroom, when the dwelling's total finished floor area is divided by the number of bedrooms, and where no more than two of the water -use appliances listed in Classification I are installed or anticipated. The design flow for Classification III dwellings is determined by adding one to the number of bedrooms, multiplying this result by 38 gallons, then adding 66 gallons. Classification IV: Classification IV dwellings are dwellings designed under part 7080.2240. Statutory Authority: MS s 115.03; 115.55 History: 32 SR 1347 Published Electronically: October 10, 2013 Copyright ©2014 by the Rev so of Statutes, State of Minnesota. All Rights Reserved.