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  • F.17 Inlet Controls | Philadelphia Water Stormwater Plan Review
    Standards 4 6 4 Blue Roof Material Standards 4 6 5 Blue Roof Construction Guidance 4 6 6 Blue Roof Maintenance Guidance Back to Chapter 4 4 7 1 Pond and Wet Basin Introduction 4 7 2 Pond and Wet Basin Components 4 7 3 Pond and Wet Basin Design Standards 4 7 4 Pond and Wet Basin Material Standards 4 7 5 Pond and Wet Basin Construction Guidance 4 7 6 Pond and Wet Basin Maintenance Guidance Back to Chapter 4 4 8 1 Subsurface Detention Introduction 4 8 2 Subsurface Detention Components 4 8 3 Subsurface Detention Design Standards 4 8 4 Subsurface Detention Material Standards 4 8 5 Subsurface Detention Construction Guidance 4 8 6 Subsurface Detention Maintenance Guidance Back to Chapter 4 4 9 1 Media Filter Introduction 4 9 2 Media Filter Components 4 9 3 Media Filter Design Standards 4 9 4 Media Filter Material Standards 4 9 5 Media Filter Construction Guidance 4 9 6 Media Filter Maintenance Guidance Back to Chapter 4 4 10 1 Pretreatment Introduction 4 10 2 Berms and Retentive Grading 4 10 3 Filter Strips 4 10 4 Forebays 4 10 5 Swales Back to Chapter 4 4 11 1 Inlet Control Introduction 4 11 2 Flow Splitters 4 11 3 Curbless Design Curb Openings 4 11 4 Energy Dissipaters 4 11 5 Inlets Back to Chapter 4 4 12 1 Outlet Control Introduction 4 12 2 Orifices 4 12 3 Weirs 4 12 4 Risers 4 12 5 Underdrains 4 12 6 Level Spreaders 4 12 7 Impervious Liners 4 12 8 Micro Siphon Drain Belts 4 12 9 Low Flow Devices Back to Chapters 5 0 Introduction 5 1 Construction Inspection 5 2 Common Construction Issues 5 3 Construction Documentation Back to Chapter 5 5 1 1 Coordinating Inspections with Other PWD Units 5 1 2 Preconstruction Processes 5 1 3 Construction Processes 5 1 4 Final Inspection 5 1 5 Post Construction Submissions Back to Chapter 5 5 2 1 Erosion and Sediment Related Construction Issues 5 2 2 Stormwater Management Practice Related Construction Issues Back to Chapter 5 5 3 1 Construction Certification Package 5 3 2 Record Drawings Back to Chapters 6 0 Introduction 6 1 Operations and Maintenance 6 2 Stormwater Management Practice Inspection Guidance 6 3 Stormwater Credits Program Back to Chapter 6 6 1 1 Maintenance Requirements for Property Owners 6 1 2 Operations and Maintenance Agreements Back to Chapter 6 6 2 1 PWD Inspections and Enforcement 6 2 2 Property Owner Inspections Back to Chapters Appendix Index A Glossary B Abbreviations C PWD Stormwater Regulations D Watershed Maps E Plan and Report Checklists F Design Guidance Checklists G Worksheets and Infiltration Waiver H Infiltration Testing Log I Landscape Guidance J Construction Certification Package K Record Drawing Sample Back to Appendices Table E 1 General Plan Sheet Requirements Table E 2 Existing Conditions Plan Requirements Table E 3 Conceptual Stormwater Management Plan Requirements Table E 4 Erosion and Sediment

    Original URL path: http://www.pwdplanreview.org/manual/appendices/f.-design-guidance-checklist/f.17-inlet-controls (2016-04-24)
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  • F.18 Outlet Controls | Philadelphia Water Stormwater Plan Review
    1 6 F 18 2 Orifice Design and Material Standards Verify that the orifice diameter for a traditional orifice i e that which is not part of an underdrain is no smaller than one inch Section 4 12 2 1 Verify that the orifice diameter for an underdrain orifice i e that which is located at the capped end of an underdrain is no smaller than 0 5 inch Section 4 12 2 1 Verify that a trash rack is provided for any orifice draining surface basins Section 4 12 2 2 For any traditional orifice three inches in diameter or smaller verify the following To prevent clogging verify that screening is provided over the orifice The dimensions of the openings within the screening must be half the diameter of the orifice The screening should be separated from the orifice not placed directly over the orifice A minimum 12 inch sump must be provided beneath the invert of the orifice to prevent the collection of debris Section 4 12 2 3 Verify that an outlet structure box with one manhole access lid on each side of the weir wall is proposed for maintenance access Adequate space to perform maintenance on the orifice must be provided on each side of the weir wall it is recommended that at least four feet by three feet of space be provided on each side of the weir wall Section 4 12 2 4 Verify that suitable access is provided to inspect and maintain all orifices Section 4 12 2 6 F 18 3 Weir Design and Material Standards For impermeable weirs verify the following Verify that check dams when placed within swales are evenly spaced and no more than six to 12 inches high Section 4 12 3 3a Verify that check dams that provide ponding in swales and are designed for infiltration are not porous as water should be ponded behind each check dam and forced to infiltrate Section 4 12 3 3b Verify that permeable weirs are not proposed in areas that receive high sediment loads Section 4 12 3 4 For spillways verify the following Verify that a minimum of one foot of freeboard is provided between the ponding elevation during the 100 year 24 hour storm event and the invert elevation of the emergency spillway Section 4 12 3 5a Verify that a minimum of one foot is provided between the invert elevation of the emergency spillway and the top of berm elevation Section 4 12 3 5b Verify that all emergency spillways are stabilized with stone geotextile or plant material that can withstand strong flows Section 4 12 3 5c Verify that spillway flow is not directed toward neighboring properties Section 4 12 3 5d F 18 4 Riser Design and Material Standards Verify that riser design balances providing positive overflow with allowing for adequate static storage Overflow must be provided at the maximum Water Quality storm ponding depth for all SMPs and for bioinfiltration bioretention basins at the minimum height to provide sufficient static storage of the Water Quality Volume WQv Section 4 12 4 1 Verify that riser pipes are specified on the plans to be constructed of high density polyethylene HDPE plastic corrugated metal concrete or other weather resistant material Section 4 12 4 2 Verify that riser boxes are constructed of precast or cast in place concrete with reinforcing as warranted All concrete must be specified on the plans to be Class C conforming to the specifications of the City of Philadelphia Department of Streets Standard Construction Items 1997 Section 4 12 4 3 Verify that trash racks or screens are proposed with the riser and that they are specified on the plans to be constructed of durable weather resistant materials resistant to photo degradation weathering oxidation or other corrosive impacts Section 4 12 4 4 F 18 5 Underdrain Design and Material Standards Verify that capped underdrains are provided for all proposed bioinfiltration bioretention basins For bioinfiltration SMPs the cap at the end located within the outlet control structure must be a solid cover to promote infiltration For bioretention SMPs the cap within the outlet control structure must be outfitted with an orifice sized appropriately to meet all applicable release rate requirements Section 4 12 5 1 Verify that all underdrains are designed to be level i e with no slope Section 4 12 5 2 Verify that all underdrains are constructed of continuously perforated HDPE plastic piping with a smooth interior and a minimum inner diameter of four inches HDPE pipe must be specified on the plans to meet the specifications of AASHTO M252 Type S or AASHTO M294 Type S Section 4 12 5 3 Verify that all underdrains are surrounded by a sand or stone layer to filter sediment and facilitate drainage Section 4 12 5 4 Verify that the sand or stone layer surrounding the underdrain is specified on the plans to be at least six inches both above and beneath the underdrain Section 4 12 5 5 If a sand layer is proposed verify that the underdrain is surrounded by geotextile fabric to prevent clogging Section 4 12 5 6 Verify that stone surrounding an underdrain is specified on the plans as being uniformly graded crushed clean washed stone and that it is noted that PWD defines clean washed as having less than 0 5 wash loss by mass when tested per the AASHTO T 11 wash loss test AASHTO No 3 and No 57 stone can meet this specification Section 4 12 5 7 Verify that sand if proposed is specified on the plans to be AASHTO M 6 or ASTM C 33 sand and to have a grain size of 0 02 inches to 0 04 inches Section 4 12 5 8 Verify that geotextile fabric is placed between the stone layer and surrounding soil to prevent sediment contamination Section 4 12 5 9 Verify that geotextile is specified on the plans to consist of polypropylene fibers

    Original URL path: http://www.pwdplanreview.org/manual/appendices/f.-design-guidance-checklist/f.18-outlet-controls (2016-04-24)
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