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Ic..- ALAN f L.L.\I\1 I I: TECHNICAL MEMORANDUM <br /> ASSOC:IATl -. INC:. <br /> llihi, .. .r><ENGINEERS•UE,.,'i.::.'.;.SC*N SIS <br /> City of San Marcos <br /> Evaluation of Service Unit Equivalency <br /> It is important to note that multi-family is not a discrete use. It is possible that some of the%-inch and 1- <br /> inch residential meters are actually duplex installations. Some of the larger meters identified as <br /> commercial use are certainly multi-family complexes. It is interesting to note that a natural progression <br /> from a 5/8-inch meter to a 1-1/2-inch commercial meter is not observed. This is quite likely due to <br /> uncertainty concerning the use and the appropriate meter size for these smaller commercial users. It is <br /> also interesting to note that irrigation meters experienced higher peak demands than similarly sized <br /> meters employed in commercial applications. <br /> Commercial Meter Installations <br /> Meter <br /> Design Observed <br /> Peak Flow Cumulative Service Unit <br /> Meter Size (gpm) Peak(gpm) Equivalent <br /> 5/8"Seal 10 0.4 1 <br /> 3/4"Seal 15 2.0 5.0 <br /> 1"Seal 25 1.0 2.4 <br /> 1-1/2"Seal 50 2.1 5.1 <br /> 2"CMPD 80 3.6 8.9 <br /> 3"CMPD 160 11.5 28.3 <br /> 4"CMPD 250 28.9 71.3 <br /> 6"CMPD 500 42.3 104.2 <br /> Irrigation Meter Installations <br /> Meter <br /> Design Observed <br /> Peak Flow Cumulative Service Unit <br /> Meter Size (gpm) Peak(gpm) Equivalent <br /> 5/8"Seal 10 1.7 4.2 <br /> 3/4"Seal 15 2.4 5.8 <br /> 1"Seal 25 3.9 9.7 <br /> 1-1/2"Seal 50 13.5 5.1 <br /> 1-1/2"Turbo 50 15.7 8.9 <br /> 2"Turbo 80 20.1 28.3 <br /> This analysis indicates that the Service Unit Equivalents the City has been assessing for commercial and <br /> residential developments appear to be reasonable for projects that use a 2-inch meter or smaller. <br /> However, it also appears as though the City has been under assessing developments with larger meters <br /> Texas Registered Engineering Finn F-13 6 of 7 <br /> ‘aus I aus apadsi-zroprojecaslg6CQ1C13 4'4Jootrn impart lees 3 19 14 docx <br />