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Huntington Levee Community Meeting

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Huntington Levee Community Meeting

January 29, 2015

Published in: News & Politics
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Huntington Levee Community Meeting

  1. 1. January 29, 2015 Building Design Branch Huntington Levee Community Meeting
  2. 2. Building Design Branch Agenda I. Project Background & Completed Tasks II. Interior Drainage Analysis III. Pump Station Design IV. Construction Access V. Schedule and Next Steps VI. Community Outreach VII. Questions 2
  3. 3. Building Design Branch • June 2006 -160 homes were flooded from a storm event • 2009 – US Army Corps of Engineers (USACE) completed a study to evaluate flood damage reduction measures in the Huntington Community 3 Project Background
  4. 4. Building Design Branch • November 6, 2012 – Fairfax County voters approved stormwater bond referendum to fund design and construction of flood damage reduction measures proposed by the USACE • June 2013 – Fairfax County awarded the levee design contract to ARCADIS • November 2013 – ARCADIS submitted the Phase I design package to Fairfax County • Survey, Geotechnical Investigation, Wetland Delineation, and Conceptual Design • January 2014 – Fairfax County and Huntington Community reach consensus on conceptual design features 4 Project Background
  5. 5. Building Design Branch • July 2014 – ARCADIS completed Hydraulic and Hydrologic Modelling for Cameron Run • September 2014 – ARCADIS submitted Schematic (30%) Design package to Fairfax County • October 2014 - Fairfax County conducted Value Engineering Workshop • December 2014 – ARCADIS began Design Development (60%) phase • December 2014 – Geotechnical Report submitted for Permitting • January 2015 – ARCADIS completed the Interior Drainage Analysis 5 Project Background
  6. 6. Building Design Branch Project Background • Earthen Levee/I-Wall Combination • Collection Drains • Pump Station Location – East end of levee • Stormwater Diversion – Concrete box culverts Key Design Features 6
  7. 7. Building Design Branch Interior Drainage Analysis Interior Levee Exterior Note: Exterior (Cameron Run) Modeling Completed July 2014
  8. 8. Building Design Branch Interior Drainage Analysis Purpose • Understand how water flows on land behind levee • Understand how adding the levee will change the water flow • Set design water elevation • Size pumps and interior water storage area • Provides the data necessary for the FEMA Accreditation package and revision to the Floodplain Maps. • Support the Floodplain Study for submission to the County Land Development Services
  9. 9. Building Design Branch 9 Existing 100-year Water Surface Elevation Interior Drainage Analysis
  10. 10. Building Design Branch Interior Drainage Analysis
  11. 11. Building Design Branch Interior Drainage Analysis HEC-HMS Modeling Approach
  12. 12. Building Design Branch Interior Drainage Analysis HEC-HMS Results – Hypothetical Events Closed Drainage Structures Peak Pond Elevation based on HEC-HMS modelling Storm Intensity Rainfall Depth (in.) Peak Pond Elevation (ft.) 2- year 3.17 5.5 5- year 4.07 6.1 10- year 4.87 6.6 25- year 6.09 7.1 50- year 7.18 7.5 100- year 8.41 8.0 500- year 12.00 9.1
  13. 13. Building Design Branch Interior Drainage Analysis Project Cross-Section Key Elevations
  14. 14. Building Design Branch 14 100-year stormwater ponding at elevation 8.0’ Interior Drainage Analysis
  15. 15. Building Design Branch Interior Drainage Analysis Historical Flood Events - Cameron Run – Jones Point Rainfall Historical Event Rainfall at Jones Point Station (Inches) Peak Water Surface Elevation (Feet) July 28, 2000 1.12 4.1 September 23, 2003* 1.80 4.6 June 25, 2006 3.51 5.1 September 6, 2008 3.40 4.4 September 8, 2011** 2.64 4.5 June 10, 2013 2.30 4.6 June 28, 2013 1.59 4.4 July 12, 2013 2.46 4.8 May 16, 2014 2.68 4.5 Peak Water Surface Elevation based on HEC-HMS modelling * Tropical Storm Isabel ** Tropical Storm Lee
  16. 16. Building Design Branch Interior Drainage Analysis Historical Flood Events - Cameron Run – Jones Point Rainfall Peak Water Surface Elevation based on HEC-HMS modelling
  17. 17. Building Design Branch 17 25-year stormwater ponding Interior Drainage Analysis
  18. 18. Building Design Branch 18 10-year stormwater ponding Interior Drainage Analysis
  19. 19. Building Design Branch Interior Drainage Analysis Interior Ponding Area • Provides location for stormwater until it can be pumped out • Controlled flooding area • Coordinating with Fairfax County Park Authority on design and possible amenities • Likely not athletic fields
  20. 20. Building Design Branch 20 Levee impact and storage requirements Interior Drainage Analysis
  21. 21. Building Design Branch 21 Pump Station
  22. 22. Building Design Branch 22 Pump Station Pump Station Equipment • 3 Active Stormwater Pumps • 1 Backup Stormwater Pump • 2 Dewatering Pumps • Generator for Emergency Power
  23. 23. Building Design Branch 23 Preliminary Interior Rendering Pump Station
  24. 24. Building Design Branch 24 Scaled Model of Pumping Configuration Pump Station
  25. 25. Building Design Branch 25 Preliminary Exterior Rendering Pump Station
  26. 26. Building Design Branch 26 Preliminary Exterior Rendering Pump Station
  27. 27. Building Design Branch 27 Construction and Maintenance Access
  28. 28. Building Design Branch • Phase II (January 2014-Winter 2017) • Schematic Design (30%) • Design Development (60%) • Permitting • Land Acquisition • Construction Documents (100%) • Bidding • Phase III (Winter 2017-Spring 2019) • Construction 28 Schedule Schedule
  29. 29. Building Design Branch • Next Steps • Site Permit Submission – February 2015 • Pump Station Work Session – February 2015 • Design Development Submission (60%) – April 2015 29 Schedule Schedule
  30. 30. Building Design Branch Schedule 30
  31. 31. Building Design Branch Community Outreach 31
  32. 32. Building Design Branch Community Outreach • Community Meeting notes will be placed on the web site 2 weeks after the meeting • Quarterly emails sent out to the project listserv with progress made in the past three months and what to expect in the next three months • Schedule – added a feature to the web site to help the Community track the progress of the active components of the project. Communication 32
  33. 33. Building Design Branch Community Outreach • Bi-annually • Important Milestones • Next Community meeting – July 2015 • Updates on Permitting • Interior Ponding Development • Pump Station Community Meetings 33
  34. 34. Building Design Branch Questions  Contact Information – Huntington Levee Project  Phone #: 703-324-5800  Email address: HuntingtonLevee@fairfaxcounty.gov  Contact Information – Stormwater Questions  Phone #: 703-324-5821  Email address: SWPDmail@fairfaxcounty.gov  Huntington Levee Website: www.fairfaxcounty.gov/dpwes/huntingtonlevee To request this document in an alternate format call 703-324-5800, TTY 711. 34

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