Eliminating Chronic Sanitary Sewer Overflows in a Historic Fort

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Transcript of Eliminating Chronic Sanitary Sewer Overflows in a Historic Fort

  • 2016 WEAT Collections Specialty Conference

    Deeper into the 4Ms of Collection Systems: Siphons, Force Mains & Lift Stations

    San Marcos, Texas January 26-27, 2016

    Prepared byRJN Group, Inc.

    Eliminating Chronic Sanitary Sewer Overflows in a Historic Fort Worth Neighborhood

    Siphon Remediation

  • WHAT IS A SIPHON?

    An inverted siphon uses pressurization to push the flow from one location to another through a U shaped tube or pipe.

    Clear Fork Drainage Area M-210 Sewer Improvements Project

    A siphon uses a vacuum to pull fluids from one location to another through a humped tube or pipe, thus..

    #DoSiphons_ _ _ _?

  • INVERTED SIPHON DEFINED More specifically, an Inverted Siphon is a pipe for conducting

    water beneath a depressed place, as from one hill to another across an intervening valley, following the depression of the ground or more simply put - a Depressed Sewer.

    Clear Fork Drainage Area M-210 Sewer Improvements Project

  • City of Allen 36-inch Inverted Siphon MAG Flow Meter

    INVERTED SIPHONS

    Clear Fork Drainage Area M-210 Sewer Improvements Project

    Siphons are an often used utility solution in a CEs technical toolbox to clear existing structural & hydraulic conflicts with proposed gravity sewers

    Inverted Siphons are also a popular design concept used for permanent meter stations.

  • EFFICIENT SIPHON DESIGNS:

    Clear Fork Drainage Area M-210 Sewer Improvements Project

    Size Pipe Diameters to achieve Scouring Velocities > 3.0 fps at least ONCE daily

    Integrate Hydraulic Slides in Siphon Structures

    Seek Laminar Flows Entering and Exiting the Siphon

  • EFFICIENT SIPHON DESIGNS:

    Clear Fork Drainage Area M-210 Sewer Improvements Project

    Odor Control (addresses the Bad Air that is coming to your siphon)

    Control Active and Passive Corrosion

    Produce a Maintenance Friendly Design

  • POOR SIPHON DESIGNS:

    Clear Fork Drainage Area M-210 Sewer Improvements Project

    Does Not achieve Scouring Velocities > 3.0 fps Excess use of Hard Bends and Weir Walls in Siphon Structures Turbulent Flows Entering and Exiting the Siphon Corrosion is not Controlled Difficult Siphon Maintenance Poorly addressed Odor Control

    #SiphonsStink

  • CHRONIC M-210 SSOs

    Clear Fork Drainage Area M-210 Sewer Improvements Project

    Recurring 18 Siphon SSOsRecurring 16 Siphon SSO

  • M-210 PROJECT BACKGROUND

    Clear Fork Drainage Area M-210 Sewer Improvements Project

    Existing M-210 Clear Fork Trinity River 18-in Single Barrel Siphon is Undersized.

    Two (2) recurring SSOs (TCEQ monitored) are located immediately upstream of siphon.

    Existing SS Mains (M-64R & M-210) serving this prominent and historic area of Fort Worth (includes TCU campus) are undersized (21 and CIPP lined 24, respectively).

    M64, M-64R and M-210 are located throughout the Colonial Country Club (CCC) golf course & most of those manholes are capped with concrete and buried due to prior SSOs.

  • M-210 PROJECT BACKGROUND - Continued

    Clear Fork Drainage Area M-210 Sewer Improvements Project

    An undersized single barrel siphon crosses Mockingbird Ln. and USACE 7x7 box culvert with integrated floodwall discharging into M-210 at the manhole on the No. 15 Tee box.

    Manhole in Mockingbird Ln. at Hartwood St. is a recurring TCEQ monitored SSO location.

    Heavy rains in 2007 resulted in an overflow at the No. 15 Tee Box manhole during the Crowne Plaza Invitational at Colonial Country Club Tournament Pro-Am event.

  • M-210 PROJECT AREA

    Clear Fork Drainage Area M-210 Sewer Improvements Project

    Holistically, the M-210 project presented a wide array of unique challenges: Permitting Coordination Jurisdictional Issues Construction Windows High Profile Project Pipeline Design Siphon Design Traffic Control

  • M-210 Drainage Areas & Flows

    Clear Fork Drainage Area M-210 Sewer Improvements Project

    Upper M-210: Q (5 Yr.. Peak) = ~3.49 MGD

    M-64R: Q (5 Yr. Peak) = ~5.00 MGD

    M-71 & M-72: Q (5 Yr. Peak) = ~2.11 MGD

    Lower M-210: Q (5 Yr. Peak) = ~10.6 MGD

    Upper M-37: Q (5 Yr. Peak) = ~1.57 MGD

    Note: Due to DS Surcharging Conditions in M-272C - Only 1.2 MGD of M-37 Sewer Flows were assumed to contribute and used for the new Trinity River Siphon Design. Q(Total) = 11.80 MGD

  • M-210 PROJECT INITIAL SCOPE OF WORK Primary objectives were to identify

    & evaluate re-route options to divert ~5.0 MGD of flow along the western CCC property line.

    USACE levee in the area is actually located on private property (berm on CCCs No. 14 fairway).

    Any proposed gravity relief main along the western boundary would be located in the toe of the slope of the levee and not allowed.

    Clear Fork Drainage Area M-210 Sewer Improvements Project

  • Evaluated various lift station & force main scenarios all were Rejected.

    Clear Fork Drainage Area M-210 Sewer Improvements Project

    No Viable Western Interceptor Relief or Pumping Option Existed for the M-210 system, but, an Eastern Relief Interceptor could work

  • M-210 PROJECT MODIFIED SCOPE

    Phased Design Plan (5 Parts)

    Clear Fork Drainage Area M-210 Sewer Improvements Project

    7,503 LF of 18 to 42 Relief Mains

    543 LF Double Barrel Siphon16 & 30

  • Clear Fork Drainage Area M-210 Sewer Improvements Project

    FINAL M-210 SCOPE OF WORK

  • M-210 DESIGN PARAMETERS

    7,503 LF of 18 to 42-inch diameter Sewer Mains (PVC & FRP) 543 LF (16 and 30 inch diameter) Double Barrel Inverted Siphon. Nine foot (9 ft.) of fall exists from the upper project limits in

    Hartman St. to the bottom of the project limits in Riverfront Dr. Relief Interceptor crosses Howards Branch Creek at Mockingbird

    St. and a 54-inch storm sewer and deep drainage swale in Forest Park before crossing the Trinity River at Riverfront Dr.

    Phased construction between annual Colonial Invitational Tournaments and other Civic Functions held in this area.

    Limited street widths and deep sewer mains (Depths to 40 ft.).

    Clear Fork Drainage Area M-210 Sewer Improvements Project

  • M-210 DESIGN PARAMETERS - CONTINUED Heavy Neighborhood Traffic Volumes Popular Public Park and Steak Restaurant Located near the

    Siphon Outfall - Access Impacts & Odor Control Examined HDD options for individual and combined pipe

    combinations for the River crossing Rejected for Cost and Constructability issues.

    Analyzed multiple pipe material combinations to try to optimize the hydraulic efficiencies of the siphon.

    Corrosion Protection - Used ConShield Additive and Polymer Concrete Structures

    Permitting

    Clear Fork Drainage Area M-210 Sewer Improvements Project

  • PERMITS USACE Minor Section 408

    Clear Fork Drainage Area M-210 Sewer Improvements Project

  • PERMITS PARKS CONVERSION

    Clear Fork Drainage Area M-210 Sewer Improvements Project

  • M-210 PARKS CONVERSION PHOTOS

    Clear Fork Drainage Area M-210 Sewer Improvements Project

  • M-210 PARKS CONVERSION PHOTOS

    Clear Fork Drainage Area M-210 Sewer Improvements Project

  • M-210 SIPHON CALCULATIONS

    Clear Fork Drainage Area M-210 Sewer Improvements Project

    Siphon Length includes 5-ft drop in elevation (field change) after numerous analysis iterations adjusting the siphon lengths and evaluating different fitting angles.

    Analyzed multiple pipe material combinations to optimize the hydraulic efficiencies of the siphon. Used DR 11 (DIPS) 16 and 30 HDPE.

    Available head drop through the siphon was 2.435 ft.

    Evaluated impacts of internal HDPE beading from butt fusing

  • M-210 PART 1 CONSTRUCTION PLANS

    Clear Fork Drainage Area M-210 Sewer Improvements Project

  • M-210 PART 1 CONSTRUCTION PLANS

    Clear Fork Drainage Area M-210 Sewer Improvements Project

  • M-210 PART 1 CONSTRUCTION PHOTOS

    Clear Fork Drainage Area M-210 Sewer Improvements Project

  • M-210 PART 1 CONSTRUCTION PHOTOS

    Clear Fork Drainage Area M-210 Sewer Improvements Project

  • M-210 PART 1 CONSTRUCTION PHOTOS

    Clear Fork Drainage Area M-210 Sewer Improvements Project

  • M-210 PART 1 CONSTRUCTION PHOTOS

    Clear Fork Drainage Area M-210 Sewer Improvements Project

  • M-210 PART 1 CONSTRUCTION PHOTOS

    Clear Fork Drainage Area M-210 Sewer Improvements Project

  • M-210 PART 1 CONSTRUCTION PHOTOS

    Clear Fork Drainage Area M-210 Sewer Improvements Project

  • M-210 PART 1 CONSTRUCTION PHOTOS

    Clear Fork Drainage Area M-210 Sewer Improvements Project

  • M-210 PART 1 CONSTRUCTION PHOTOS

    Clear Fork Drainage Area M-210 Sewer Improvements Project

  • M-210 PART 1 CONSTRUCTION PHOTOS

    Clear Fork Drainage Area M-210 Sewer Improvements Project

  • M-210 PART 1 CONSTRUCTION PHOTOS

    Clear Fork Drainage Area M-210 Sewer Improvements Project

  • Questions?

    Special Thanks to Derek Schwanke on this Project Closing Remarks -

    Clear Fork Drainage Area M-210 Sewer Improvements Project

    #DoesyourSiphonRock?