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Proposed Project: Spring Lane and Hendren Street Storm and Sanitary Sewer

This presentation provides an overview of a potential project to relive neighborhood flooding and sanitary sewer issues in an area of Philadelphia that is served by a private sewer. This was delivered in a face to face meeting with residents in the vicinity of Spring Lane and Hendren Street on November 12, 2013.

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Proposed Project: Spring Lane and Hendren Street Storm and Sanitary Sewer

  1. 1. Spring Lane and Hendren Street Proposed Flood Relief Project November 12, 2013 www.phillywatersheds.org
  2. 2. Outline Review of Past Problems and Project Objectives PWD Involvement and Initiatives Watershed and Neighborhood Findings PWD Proposed Contributions to Solutions Homeowner Involvement Choices and Decision Making
  3. 3. Hendren Street and Spring Lane Review of original problem Stabilize the Spring Lane Outfall Protect the existing 4” force main Address the flooding impacts experienced by residents
  4. 4. Infrastructure Damage: Failed Outlet700 Block Spring Lane
  5. 5. Infrastructure Damage: Failed Outlet 700 Block Spring Lane
  6. 6. Impaired Driver Safety: Standing Water700 Block Spring Lane PONDED WATER LIMITS AFTER JUNE 2013 THUNDERSTORM
  7. 7. Impaired Driver Safety: Sediment Deposition @ Hendren & Spring Intersection
  8. 8. Roadway/Lawn Interface Deterioration Eroded gutter@ Hendren & Spring Intersection
  9. 9. Homeowner Impacts: Erosion and Pavement Damage- 600 Block Hendren Street
  10. 10. PWD Involvement and Initiatives Initiative 1: Homeowner Surveys Quantify number of homeowners adversely affected by stormwater runoff Concurrently gather data to evaluate provision of sanitary sewer service Initiative 2: Analysis Determine Source(s) and destinations of problematic runoff Evaluate Potential remedies Initiative 3: Recommendations
  11. 11. PWD Survey Response Summary 45 Surveys Distributed / 19 Responses (42%) 15 Surveys on Spring Lane/ 7 Responses (47%) 30 Surveys on Hendren / 12 Responses (40%)
  12. 12. PWD Survey Summary: Septic ID Good Condition Fair Condition Poor Condition Spring Lane 4 2 1 Hendren Street 3 5 4 Total 7 7 5
  13. 13. PWD- Analysis- Source of Runoff Drainage Area to Spring Lane is approximately 25 Acres
  14. 14. Runoff Sources: Manatawna Avenue to Spring Lane
  15. 15. Runoff Sources: Hendren Street and Yards to Spring Lane
  16. 16. Summary of Observations: PWD’s installation of storm sewers/inlets in Manatawna Avenue, Hendren Street and Spring Lane will provide control of stormwater from city streets and public rights-of-way, however, runoff from private property, driveways and roof tops will need to be directed and connected to this infrastructure.
  17. 17. Manatawna Stormwater Improvements Inlets can be added in Manatawna to intercept this street runoff HOWEVER, this represents only a small fraction of the total land area currently contributing to Hendren and Spring flooding.
  18. 18. PWD Analysis: Runoff Path Yards Hendren Street Colonial Swale and Yards Residences Low Point in Spring (Damaged Storm pipe and Headwall)
  19. 19. Runoff Paths: Colonial Gutter
  20. 20. Runoff Paths: Yards-Hendren to Spring
  21. 21. Runoff Paths: Streets- Spring to Field
  22. 22. Runoff Paths: Streets -Low Point Spring
  23. 23. PWD Analysis: Significant Runoff Generators Surface Character affects the amount of runoff Impervious Surface like roofs, drives, streets and walks prohibit infiltration of stormwater. Nearly 100% Runoff Pervious, Vegetated Surfaces absorb some runoff, however runoff still occurs, especially in more intense storms
  24. 24. Watershed Statistics: Impervious Surface 25 Acres Total Drainage Area 25% Impervious (6.3 acres) 2.3 acres streets (public) 4.0 acres roof tops and driveways (privately owned) 75% Pervious (18.6 acres – privately owned)
  25. 25. Public vs. Private Runoff Generators Runoff from streets and public rights-of-way 2.3 Acres or 9% Yards, roofs and driveways 18.5 acres + 4 Acres = 22.5 Acres or 91%
  26. 26. Sanitary Sewer Service Existing Sanitary Challenges Of the respondents to the survey, 62% indicated that their existing septic system was only in “fair” or “poor” condition
  27. 27. Sanitary Sewer Design Considerations Spring Lane South side of Spring served by a standard depth gravity sewer. A new pump station will require acquisition of additional right-of-way
  28. 28. Sanitary Sewer Design Considerations Hendren Street South side residents (uphill) can be served by standard depth (8-feet Separate) sewers North side residents (downhill) are below standard depth sewers
  29. 29. PWD Stormwater Remedies: Localized Damage solution is available; Repair damage at Spring Lane outfall Interim: Armor and reinforce
  30. 30. Typical Repair of Damaged Outfall
  31. 31. PWD Stormwater Remedies: Construction of a Storm Sewer pipe and inlet system in public rights of way is possible Will provide for safe conveyance of captured runoff Will fortify repair of damaged Spring Lane outfall and protect forcemain
  32. 32. Actions Required beyond PWD’s Proposed Stormwater Remedies: Doesn’t Solve the Entire Problem Requires that private property runoff be redirected to intercept 100% of runoff Will not resolve homeowner flooding emanating from private property runoff
  33. 33. Stormwater: Increase Effective Runoff Collection – Connect All Roofs to Proposed Main
  34. 34. Stormwater: Increase Effective Runoff Collection – Connect All Roofs to Proposed Main
  35. 35. PWD Sanitary Sewer Remedies: Construction of Sanitary Sewer and Pump station is possible Will provide alternative to replacement of failing septic systems Requires additional efforts to provide service to entire neighborhood Downslope properties that have plumbing discharge below street level may need to install ejector/grinder pumps
  36. 36. Choices Related to PWD Action Construction Impacts Financial and Action Commitment
  37. 37. Choices Related to PWD Action Construction Impacts Potential roadway changes Widening ADA Walks Curbs or swales Driveway crossings Tree, Shrubbery and Fence Removal Probable
  38. 38. Construction Choices Related to PWD Action: Fence POTENTIALLY at Risk
  39. 39. Construction Choices Related to PWD Action: Fence POTENTIALLY at Risk
  40. 40. Construction Choices Related to PWD Action: Trees POTENTIALLY at Risk
  41. 41. Construction Choices Related to PWD Action: Shrubbery POTENTIALLY at Risk
  42. 42. Construction Choices Related to PWD Action: Shrubbery and Specimen Tree at Risk
  43. 43. Consequences of PWD Action: Shrubbery and Specimen Tree at Risk
  44. 44. ALTERNATIVE APPROACH Reduced extent of curbing and street widening Intercept Runoff with Roadside Swales in-lieu of Curbing Retain Neighborhood Character Provides Infiltration Reduces Runoff Volume Improves Water Quality
  45. 45. Alternative Approach: Hendren Street Section @ Regulated Width
  46. 46. Alternative Approach: Hendren Street Section - Retained Narrow Width- No Curb
  47. 47. Choices Related to PWD Action: Financial and Action Commitment PWD Responsibility Homeowner Responsibility 3540 feet of Storm Water Main: Construct, Own & Maintain 3293 feet stormwater laterals and appurtenances from downspouts to edge of street: Construct, Own & Maintain 462 feet stormwater laterals to edge of street: Construct only. (will be owned and maintained by homeowner) Decommission septic system 3075 feet of Sanitary Sewer Main: Construct, Own & Maintain. 453 feet sanitary laterals to edge of street: Construct only. (will be owned and maintained by homeowner) 3806 feet sanitary laterals and appurtenances from house to edge of street including : Construct, Own & Maintain Pump station and + 700 Feet of Forcemain: Construct, Own & Maintain Grinder Pump (if required): Construct, Own & Maintain Inlets: Construct, Own & Maintain Swales: Construct, Own & Maintain Pay Assessment fee: $9.00/lineal foot of frontage Driveway restoration in area of disturbance only Pay monthly service fee Remove vegetation within construction limits* Acquire permits and approvals for construction within the public rights-of-way, Only * Acquire permits and approvals for construction within homeowner property limits Landscaping outside the right of way that is affected by construction will be replaced with young nursery stock of similar species. Landscape replacement within the right of way will be replaced depending on the situation. Utility, safety and maintenance issues will be evaluated.
  48. 48. Steps to Obtain Public Sewers Residents signed petition to PWD or their Councilperson City Council Ordinance is required for a public sewer Process from Ordinance to construction can take a few years
  49. 49. Impact to Customers Each property owner is assessed at the rate of $9.00 per linear foot of property frontage Plumbing which drains to the back of the house needs to be redirected to the front of the house (PWD has zero interest loans available) Yard drains, downspouts should be connected to new stormsewer via new stormwater lateral (PWD has zero interest loans available)
  50. 50. Benefits of PWD Actions Reduced runoff from street and connected roofs…reduced property damage Improved Driver Safety-Reduced standing water Elimination of maintenance associated with on-lot septic system Alternative to replacement of expensive on-lot septic system Improved marketability of property
  51. 51. Homeowner Solution Choices PWD Installation of Stormwater and Sanitary Sewer conveyance System? …or Limit PWD’s actions to Repair of Damaged Spring Lane outfall? Other?