Unit III - Sanitary Sewer Design Standards - City of Fort Wayne

Water Resources Development Criteria/Standards Manual Chapter 4UNIT III - Sanitary Sewer Design StandardsBuilding Sewers4.1 PurposeCHAPTER 4 – BUILDING SEWERSThe purpose of this chapter is to outline the requirements for building sewers. This chapterestablishes the technical design criteria for all building sewers within the City of Fort Waynejurisdiction. Any variances from these standards must be approved by Water Resources.4.2 Prohibition Against Clear Water DischargesNo building sewer with any of the following sources of clear water connected to it shall beconnected to the City’s sewer system:• Foundation or footing drains. • Roof drains / downspouts• Yard drains • Sump pump discharges• Heat pump discharges • Cooling water discharges• Storm drain connections • Any other sources of surface runoff orgroundwater4.3 Buildings Served4.3.1 Maximum Number of Buildings ServedA separate and independent building sewer shall be provided for every building, exceptwhere one building stands at the rear of another on an interior lot and where no privatesewer is available or can be constructed to the rear building through an adjoining alley,courtyard, or driveway. The building sewer from the front building may be extended tothe rear building and the whole considered as one building sewer. Calculationssupporting sizing must be provided to Water Resources. Prior permission for suchconfiguration and sizing must be granted by Water Resources.4.3.2 Gravity Sewer ServiceIt is recommended that gravity building sewer connections only be constructed for homesor buildings where the lowest elevation to have sanitary services is one foot (1’) or moreabove the top of the manhole casting elevation of the first upstream manhole on thepublic sewer to which the connection is proposed to be made. In instances where this onefoot distance is not achievable and in areas susceptible to back-ups, proper backflowprevention shall be designed. If the first upstream manhole is at a higher elevation due tothe natural topography of the area, an alternate method may be selected by WaterResources for the purpose of determining the feasibility of gravity connection.4.3.3 Non-Gravity Sewer ServiceA gravity building sewer connection will NOT be allowed for homes or buildings wherethe lowest elevation to have gravity sanitary services is less than one foot (1’) above thetop of the manhole casting elevation of the first upstream manhole on the public sewer toCreated: January 1, 2002 III - 4 - 2 City of Fort WayneRevised: