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<br />'-'7'''- <br />__.~:_:"_.:'./_.,s~~;"'';" <br /> <br />Inflow Ilnfi Itration <br /> <br />With the Metropolitan Council Environmental <br />Services (MCES) taking a greater interest in <br />excessive inflow and infiltration II/I) from client <br />cities, Bonestroo's civil and environmental service <br />groups have developed an 1/' reduction program <br />that can be customized for any metro area <br />community. <br /> <br />Our 1/1 reduction program focuses on three things: <br /> <br />. Confirming MCES's 1/1 figures for our client <br />city <br />. Determining the sources of 1/1 through study and <br />analysis <br />. Devising a cost effective 1/1 reduction program <br />that will meet MCES requirements <br /> <br />Infiltration <br />Infiltration is the extraneous clear water entering a sanitary sewer system (services, laterals, trunks, <br />and manholes) from the ground, through such means as defective pipes, pipe joints, connections, or <br />manhole walls. Infiltration does not include and is distinguished from inflow. <br /> <br />Inflow <br /> <br />Inflow is the extraneous clear water entering a sanitary sewer system from such sources as roof <br />leaders; cellar, yard, and area drains; foundation drains; cooling water discharges; drains from springs <br />and swampy areas; manhole covers; and cross connections to storm sewers. Inflow does not include <br />and is distinguished from infiltration <br /> <br />Infiltration/Inflow (1/1) <br />Infiltration/inflow is the total volume of extraneous clear water without distinguishing the source. <br /> <br /> <br />Where does VI come from? <br /> <br />Typical municipal 1/1 sources are: <br /> <br />. Cross connections between sanitary and storm <br />sewers <br />. Cracked sanitary pipes <br />. Leaking pipe joints <br />. Leaking manholes or holes in manhole covers <br />. Connections from basement sump pumps, <br />foundation drains, ete. <br /> <br />The first four sources are public and, once <br />pinpointed, can be substantially reduced through <br />good in-house maintenance and repair programs. <br />The final source, private property sump pumps <br />and foundation drains, requires a comprehensive <br />education and Inspection program for effective <br />reduction <br /> <br />MCES is asking all communities served by the <br />metropolitan disposal system, whether they are <br />on the excessive 1/1 list or not to develop and <br />implement an 1/1 program as soon as practicable. <br />All communities will be required to include such a <br />program in their next comprehensive plan, due in <br />2008. <br /> <br />~ <br /> <br />~ <br /> <br /> <br /> <br />The rwo cham above iIIusrrare why excessive V' ham- <br />pers communlfy growrh When V' fills rhe sysrem's <br />capaciry, rhere is simply no room for new housing or <br />commercial growrh. <br />