Designation:E2728−11StandardGuideforWaterStewardshipintheDesign,Construction,andOperationofBuildings1ThisstandardisissuedunderthefixeddesignationE2728;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguideisintendedtoinformsustainabledevelop-mentinthebuildingindustry.Itoutlinesidealsustainabilityandappliedsustainabilityforwatermanagement,consistentwithGuideE2432.Bothidealsustainabilityandappliedsustainabilityshouldinformdecisionsregardingwaterman-agement.1.1.1Idealsustainabilityispatternedonthehydrologicalcycle.Thisprovidestheconceptgoalsanddirectionforcontinualimprovement.1.1.2Appliedsustainabilityoutlinescurrentbestpractices.Thisidentifiesavailableoptionsconsideringenvironmental,economic,andsocialopportunitiesandchallenges.Themostappropriateoption(s)arelikelytovarydependingonthelocationoftheproject.1.2Watermanagementchallengesdifferenormouslyde-pendingonthetypeofbuiltenvironmentandtheavailablewaterresources.1.2.1Thegeneraldemandsofthebuiltenvironmentvaryfromverylowdensityruraldevelopmenttocrowdedurbandevelopment.Largecitiespresentaparticularchallenge,with400citiesworldwidehousingover1millioninhabitants.1.2.2Successfullymeetingthechallengesofunevendistri-butionofwateraroundtheworld,depletionofgroundwater,changingrainfallpatterns,andotherwaterindustrytrendsrequiressustainablesolutionsfortheeffectivemanagementoftheentirewatercycle.1.2.3Sustainabledesign,construction,andoperationofwaterandwastewaterservicesforthebuiltenvironmentarecriticalcomponentsofwaterstewardshipandglobalsustain-ablewatermanagement.1.3Waterstewardshipencompassesbothpollutionpreven-tion(qualityissues)andconservation(quantityissues).1.4Thevaluesstatedininch-poundunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddr...
