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

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Water Resources Development Criteria/Standards Manual Chapter 3UNIT III – Sanitary Sewer Design StandardsPublic Sewers3.10 Sewer Pipe .............................................................................................................................III-3-113.11 Manholes................................................................................................................................III-3-123.11.1 General......................................................................................................................III-3-123.11.2 Manhole Locations ...................................................................................................III-3-123.11.3 Manhole Spacing ......................................................................................................III-3-123.11.4 Manhole Diameter ....................................................................................................III-3-123.11.5 Flow Channel............................................................................................................III-3-133.11.6 Bench ........................................................................................................................III-3-133.11.7 Watertight Bolt-Down Construction.........................................................................III-3-143.11.8 External Drop Inlets..................................................................................................III-3-143.11.9 Adjustment Rings .....................................................................................................III-3-143.12 Stubs.......................................................................................................................................III-3-143.13 Siphons...................................................................................................................................III-3-143.14 Floatation ...............................................................................................................................III-3-143.15 Anchors..................................................................................................................................III-3-143.16 Concrete Encasements ...........................................................................................................III-3-153.17 Railroad Crossings.................................................................................................................III-3-153.17.1 Criteria ......................................................................................................................III-3-153.17.2 Railroad Conflict Drawings ......................................................................................III-3-163.18 Highway Crossings ................................................................................................................III-3-163.19 Casing Pipe and Tunnel Liners..............................................................................................III-3-173.19.1 Tunnel Liners............................................................................................................III-3-173.19.2 Pipe Casing ...............................................................................................................III-3-17EXHIBITSIII-3-1 Wastewater FlowsIII-3-2 Peaking FactorsIII-3-3 Minimum Allowable SlopesCreated: January 1, 2002 III - 3 - 2 City of Fort WayneRevised:
Water Resources Development Criteria/Standards Manual Chapter 3UNIT III – Sanitary Sewer Design StandardsPublic Sewers3.1 PurposeCHAPTER 3 – PUBLIC SEWERSThis chapter focuses on the design elements and basic hydraulic criteria necessary for the properdesign of sanitary sewer systems. This chapter establishes the minimum standards and technicaldesign criteria for all sanitary sewer systems within the City of Fort Wayne service area. Knownvariances from these design standards must be approved by Water Resources prior tocommencement of design. Unit III of the Design Manual shall be referenced for additionaldesign detail and methodology.3.2 General Improvement Location CriteriaSound engineering judgement shall be utilized when determining locations for sanitary sewers.Existing easements and rights-of-way shall be utilized if at all possible. Service needs of both thepresent service area and future service areas should be thoroughly evaluated.3.3 Horizontal Alignment Criteria3.3.1 GeneralAll sanitary sewers shall be constructed with a straight alignment between manholes.Where sewer depth is ten feet (10') or less, sewer lines and manholes shall be located aminimum of ten feet (10') horizontally from any part of a building structure or itsfoundation. For sewer depths greater than ten feet (10'), this minimum distance shall befifteen feet (15').3.3.2 Placement in Existing Rights-of-Way and EasementsFor sanitary sewers located within existing or proposed street right or way, the preferredplacement should be as generally defined on the Standard drawings for RecommendedUtility Placement as found in the Separations and Backfill section of Unit VI - StandardDrawings. Three drawings, Recommended Utility Placement in Public Right-of-Way,Recommended Utility Placement in Back to Back Easement, and Recommended UtilityPlacement in Existing Perimeter Easement are presented. These utility locations areapplicable to existing right-of-way and easements. In isolated situations, sanitary sewerscan be placed in separate easements outside of the existing rights-of-way or easements.Consideration for allowances for future curb and gutter shall be taken into account whenconsidering the sewer location. In areas with concrete pavement, consideration shall begiven to placing the sewer in a location such that one edge of the pavement to beremoved would coincide with existing construction joints. This procedure would allowfor the sawing and removal of only one side of the pavement. Manhole structures shallbe either completely outside the pavement or completely inside the pavement. Theexistence of curbs or proposals for future curb and gutter shall be taken into accountwhen evaluating the benefit of reducing the number of manholes in curved streets.Created: January 1, 2002 III - 3 - 3 City of Fort WayneRevised:
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Unit III - Sanitary Sewer Design Standards - City of Fort Wayne

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