06-H Lost Water Study - Laserfiche WebLink

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Proposal Comprehensive Water Distribution System Audit I * Metea that are too large for the appliwtion and do not read at low consumption levels To determine the source of the unbilled water in the system, several important areas of the utiliry operation need to be evaluated. Theseareasareidentifiedinthefollowingitems: rt An evaluation of the installation and accurary of various meters installed in the City's system must be performed. * Investigate and estimate the amount of unbilled water used bythe Ciryand other customers. * The existing billing saftware should be examined to canfirm thatthere are no under-billed accaunts. * Thepossibleleakageinthesystemmustbeevaluated to determine the eztent of the problem, and to identi{y, in so far as possible, the areas with most of the leaks. * Determine the feasibiliry af ineter replacements to reduce the amount of unbilled water in the system. Project Approach Problem Identification The firyof Paris produces approximately 12 to 15 M6D of water on on average day. The typical consumption for residentiaVrommercial uses is reported to be 2.6 MGD. Therefore about 10 to 12 MGD of water is being supplied to major customers. The first adion should be to confirm that the meters far the major cusromers are reasonably accurate. The Grystaff has a number of these metersthat are routinely colibrated as partofthe normal operations; therefore, this portion of the projed should proceed rapidly. Additionally, the master meter's (the 42-inch meter) calibration needs to be wnfirmed, since that is the basis for much of the dotn that have been gathered. Checking Carter nBurgess calibration of the master meter appears to be reasonably straight forward, and the volumetric procedure described helow will be used. Flow Meter installation The (arter 8 BurgessTeam will visitthe meters identified by Cirystaff andevaluatetheinstallatian. The evaluation will be conduded for the following reasons: * To determine if ihe installation of the meter mn have an adverse impact on the accuracy, and * Toevaluatethelocotianandinstallationforsubsequent in situ mlibration. The Team wil I document the canditions at each meter location by preparing a field sketch ofthe instailation and o6taining digital phatographs. Installation Errors The most common errors in installing flow meters are: * Lacating the meter in a position where it dces not flow full. * Failing to provide the upstream and dawnstream conditions necessory to minimize turbulence in the meter. 16