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<br /> -.l" <br /> , <br /> .- -iJII~~ CONSULTING ENGINEERS <br /> Maier Stewart & Associates Inc. <br /> fm~c TO: CITY counCII_. CITY OF ARIJDI HILLS <br /> II~OH : TERRY J, HAURFR, CITY ENGINEER ~ <br /> FILt:: 520-015-80 <br /> RE: WATER DISTRIBUTION SYSTEH LOSSES <br /> The C: [y staff has unalyzed metered Hater records and TI',(; bi 11 ings from n,e <br /> City of Roseville and determined that tnere is a significant unexplained <br /> difference in the data. The difference or apparenc JOSS is tyoically 20 TO <br /> 25 percent of the volume recorded by Roseville. <br /> In response to this analysis, the City Council initiated an inceoc:ve <br /> program in an attempt to idenTify the sources of [he less ard DocenTially <br /> recover lost income. <br /> fie have reviewed the metering dato from early 1989, discussed l:1e 11'.etero <br /> \r~~th publ ic \'-/orks personnel> looked dt. several uf [j-lt: lCl('~e r~C[fJS in U-'i? <br /> system and conducted some research, e 'l'idter loss -in l\('Jen H-i.I'I:; ~Uf-:~; <br /> . appear excessive in comparison to other municipal SYS1.2ms. HOd2ver, lh~:~re <br /> is alHays some loss in the system. Even rnunicipa"iit-ies hl-iU"1 tigOr'C)~iS 12iJk <br /> detection and repair programs Hill typically only be able to achieve a 12 <br /> percent loss rate due to the many and varied types of potential leaks. <br /> Therefore, He Hould anticipate that reasonable system losses in Arden Hills <br /> Hould be in the 12 to 15 percent rate. <br /> Studies indicate that there are eight areas Hhich may result in water loss <br /> in typical munLipal systems. These areas and their applicability to the <br /> Arden Hills situation are as follows: <br /> A. Inaccurate Master Meters <br /> B. Inaccurate Commer'cial/lnclustrial ~leter5 <br /> C. Inaccurate Residential Meters <br /> O. Meter Reading and Billing Errors <br /> " Underground Leakage <br /> - . <br /> F. Hydrant Usage <br /> G, Unmetered Connections <br /> Ii [mproper System Controls <br /> . <br /> 1959 SLOAN PLACE, ST PAUL, MINNESOTA 55117 612-774.6021 Equal Opportuni1y Employer <br />