October 2012
1-15
1.2
Water Management Planning
Table 1-2. Example Laboratory FacilityWater Balance for PotableWater Source
Table 1-3. Example Laboratory FacilityWater Balance for Air Handler Condensate Supply
Major Process
Annual Water
Use (gallons)
Percent
of Total
Basis of Estimate
Total Annual Potable
Water Supplied
4,900,000
100
MonthlyWater Bills
Use 1: Sanitary (e.g., toilets,
urinals, showerheads,
faucets)
550,000
11
Engineering estimate of
750,000
gallons per year,
subtracting onsite rainwater
supply of 200,000 gallons/year
Use 2: Water-Cooled Ice
Machine in Commercial
Kitchen
300,000
6
Engineering estimate using
manufacturer product litera-
ture
Use 3: Pre-Rinse Spray Valve
50,000
1
Engineering estimate
Use 4: Steam Sterilizer
(
i.e., continuous discharge
tempering water)
300,000
6
Instantaneous flow rate mea-
surement
Use 5: Reverse Osmosis
Supply
100,000
2
Metered
Use 6: Cooling Tower Make-
UpWater
3,000,000
62
Metered
Use 7: Steam Boiler Make-
UpWater
300,000
6
Metered
Sum of Accounted-for
PotableWater Use
4,600,000
94
Summed from uses 1
through 7
Unaccounted-for Potable
Water Use
300,000
6
Calculated by difference
from total water use and
accounted for water use
(
since this is less than 10 per-
cent, the facility likely does
not have a significant leak)
Major Process
Annual Water
Use (gallons)
Percent
of Total
Basis of Estimate
Total Annual Air Handler
Condensate Supplied
500,000
100
Metered
Use 1: Cooling Tower Make-Up
Water
500,000
100
Metered (separately from
city-supplied make-up
water)
Sum of Accounted-for Air
Handler CondensateWater Use
500,000
100
Use 1
Unaccounted-for Air Handler
CondensateWater Use
0
0
Calculated by difference
from total water use and
accounted for water use
