Page 246 - Water Loss Control

Contr olling Appar ent Losses—Data Transfer Err ors 219

Usage Profile
45

40
35
4 gpm/hr. Leak
30 being registered
Gallons 25
20
15
10
5
0
12:00 AM 1:00 AM 2:00 AM 3:00 AM 4:00 AM 5:00 AM 6:00 AM 7:00 AM 8:00 AM 9:00 AM 10:00 AM 11:00 AM 12:00 PM 1:00 PM 2:00 PM 3:00 PM 4:00 PM 5:00 PM 6:00 PM 7:00 PM 8:00 PM 9:00 PM 10:00 PM 11:00 PM

Day 8-digit encoder
FIGURE 13.17 Neptune’s 8-digit encoder captures low leakage fl ow in early morning hours.
(Source: Neptune Technology Group.)

150
132,850 gal

125 Normal 1–20 gpm usage 1/16 gpm Leak
Shaded area indicates water 100,000 gal
Total water used (kgal) 75 “Combined”
(i.e. revenue) lost if meters do
100
not accurately measure low flow

50

25 32,850 gal

0
0 1 2 3 4 5 6 7 8 9 10 11 12
Months
FIGURE 13.18 Total water usage for one residence with and without 1/16 gpm leak.
(Source: Neptune Technology Group.)