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REFERENCE
200
100
90
80
70
60
50
40
30
20
10
10 20 30
40
50 60 80 90
100
70 200 300 400
GUIDELINES FOR SIZING
SYSTEM CAPACITY
System Capacity refers to the rate of flow in gallons per minute (gpm) necessary to eciently maintain the system. The “Fixture Unit” method is suggested for
determining this figure. This approach assigns a relative value to each fixture or group of fixtures normally encountered. Determination of the required System
Capacity is as follows:
 List all fixtures involved in the installation and using Figure 1, assign a Fixture Unit value to each. Add to obtain total.
 Referring to Figure 2, locate the total Fixture Unit amount along the horizontal axis of the graph and follow vertically until intersecting the plotted line. Read
the System Capacity in gpm along the vertical axis.
Fixture Description Unit Value Total Used
Bathroom group, consisting of lavatory, bathtub
or shower, and (direct flush) water closet
10
Bathroom group, consisting of lavatory, bathtub
or shower, and (flush tank) water closet
6
Bathtub with 1-1/2" trap 2
Bathtub with 2" trap 3
Bidet with 1-1/2" trap 3
Dental unit or cuspidor 1
Drinking fountain 1
Dishwasher (domestic type) 2
Kitchen sink (domestic) 2
Kitchen sink (domestic with waste grinder) 3
Lavatory with 1-1/2" trap 1
Lavatory (barber or beauty shop) 2
Laundry tray (2-compartment) 2
Shower stall 2
Shower (group), per head 3
Sink (service type with floor drain) 3
Sink (scullery) 4
Sink (surgeons) 3
Urinal (with flush valve) 8
Urinal (with flush tank) 4
Water closet (flush valve) 7
Water closet (flush tank) 3
Swimming pools (per 1000 gal. capacity) 1
Unlisted fixture with 1-1/4" trap size 2
Unlisted fixture with 1-1/2" trap size 3
Unlisted fixture with 2" trap size 4
Unlisted fixture with 2-1/2" trap size 5
Unlisted fixture with 3" trap size 6
Unlisted fixture with 4" trap size 7
Water softener (domestic) 4
Washing machine 2
TOTAL
FIGURE 1
FIGURE 2
FIGURE 3
102