CCP 12-10-1990 - Laserfiche WebLink

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~ ~~ '''J.' WATER DISTRIBUTION SYSTEM LOSSES . NOVEMBER 20, 1990 P,~,GE HiO . A. Master Meter Accuracy The three (3) master ~eter installations between Arden Hills and Roseville are routinely calibrated and certified annually. These efforts should keep the meters recording as accurately as possible. B, Commercial/Industrial/Charicable Meter Accuracy The large C/I/C meters in Arden Hills have not been calibrated in many years and their accuracy may be questioned. All metering systems can be expected to "wear" during norrnal operation and will eventually suffer some consequences of this "wear" over an extended periOd of time. A representative of St. Paul Water Utility indicated that one of their large meters is changed every six months due to wear on the mechanical parts. This is an extrerne case, but Ihese larger meIers should be calibrated regularly due to their impact on [he overall system consurnption. The Arden Hills water records frorn 1989 and the first half of 1990 indicate that the large users co~bine to consume 49 [0 55% of the total ,'later metered in the system. The tVienty two (22) ~: argest users . accounted for 40 and 36% of the first and second quarter 1990 usage, respectively. Since the volume of water run through tI:ese rl,eters is quite large, a small percentage of error could account for a significant difference, C. Residential Meter Accuracy Using the total consumption records and the number of connections, the following per connection usage rates were calculated: Period No. of Users Per Connection Usage i~alions per day @ 90 days/quarter) 1089 2308 46 2089 2313 12 3089 2313 82 4089 2317 86 1090 2318 21 2090 2320 59 .