Mill Creek/Peaks Branch/ State Thomas
Drainage Relief Tunnel
Parkdale / Lawnview Avenue Neighborhood April 26, 2016
Mill Creek, Peaks Branch and State-Thomas Watersheds
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PARKDALE
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Basin Area State-Thomas – 450 acres Mill Creek – 2,200 acres Peaks Branch – 3,100 acres East Peaks – 1,100 acres
Land Uses Upper Basin – Residential Lower Basin – Commercial
What’s in these basins? Baylor Hospital Old City Park Deep Ellum IH-30 Fair Park “M” Streets
Basin Characteristics
Flooding has been a problem in the Mill Creek, Peaks Branch and State-Thomas areas for years
Mill Creek and Peaks Branch were originally natural streams draining into the Trinity River and White Rock Creek
In the early 1900’s, the streams were enclosed in underground pipes
Re-development in the State-Thomas area has exceeded the capacity of local and outfall drainage systems
The drainage systems were sized to carry smaller standard storm events
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Mill Creek / Peaks Branch State-Thomas Background
In a 100-year rain event (1% annual chance):
Undersized local drainage systems cause streets to flood
Flood depths are up to 10 feet high
Additional capacity is needed in the storm sewers to accept added run-off from neighborhood drainage system
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Mill Creek / Peaks Branch State-Thomas Background
Mill Creek and Peaks Branch History
Underground Storm Sewer Construction - 1930s
May 1995 Flood March 2006 Flood September 2007 Flood
Flooding businesses and homes
Baylor Emergency Room closed - flood damage $5M
Old City Park
Fair Park
IH 30 closed due to high water
May 1995 Flood Dallas Morning News Front Page May 7, 1995
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Widespread flooding throughout Dallas
March 19th rainfall totals as high as 9.8” in Old East Dallas
Extensive street, structure and vehicle flooding in East Dallas
March 2006 Flood
Mill Creek Flooding – Baylor Hospital Area Flooding March 19, 2006
Monticello Avenue – West of Greenville Avenue
Mill Creek Flooding – March 2006
Zaragoza Elementary Flooding 11
Peaks Branch Flooding – March 2006
Worth Street Flooding 12
Peaks Branch Flooding – March 2006
I-30 Flooding – March 2006
City Commissioned Studies
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Mill Creek Mill Creek Master Drainage Plan Study (2006)
Peaks Branch Lower Peaks Branch Preliminary Design Report (1976) Peaks Branch Preliminary Design Report (1989)
Mill Creek and Peaks Branch Initial Study (2008) State-Thomas Area Studies
Town Branch Study (1986) State-Thomas Master Drainage Plan (1998) Woodall Rodgers Drainage Tunnel Improvement Plan (2007)
2006 Plan – Mill Creek(1) / Middle Peaks Branch(2) and State Thomas(3)
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Mill Creek/Peaks Branch/State Thomas Drainage Tunnel
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Tunnel Length – 5 Miles Tunnel Diameter – 30 Feet Tunnel Depth – 70 Feet to 150 Feet Tunnel Volume – 160 Million Gallons Project Budget – $320 Million Construction Duration – 5 Years starting in 2016 Construction method – Tunnel Boring Machine
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Project Information
Mill Creek / Peaks Branch / State Thomas Drainage Relief Tunnel
Tunnel Profile
Drainage Relief Tunnel
http://voteyesdallas.com/press-room-images.html
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30’x35.5’ HORSESHOE MAIN TUNNEL SECTION
OUTFALL TO SITE A (2 MILES)
30’ CIRCULAR MAIN TUNNEL SECTION
SITE A TO END (3 MILES)
Tunnel Sections
Tunnel Boring Machine (TBM)
Deep Tunnel Construction
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Tunnel Boring Machine (TBM) Workers on a TBM after break-through
Advantages to tunneling: • Minimal utility relocation • Reduced ROW acquisition • Minimal street replacement • Minimal traffic impacts
Areas Currently Subject to 100-Year Flooding in Mill Creek, Peaks Branch and State Thomas Watersheds
Note: Hatched area denotes known street flooding in the State Thomas area
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60% of the Areas Removed from 100-Year Flooding After Mill Creek, Peaks Branch and State-Thomas Tunnel is Constructed
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White Rock Creek Drainage Area
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Water surface elevations in the White Rock Creek and Forney Branch floodplains remain the same
Parkdale / Lawnview neighborhood impacts Construction truck traffic permitted along SH 352 (Scyene Road)
Construction hauling will be limited to 7 am to 7 pm
Parkdale / Lawnview Concerns - Mill Creek / Peaks Branch /
State Thomas Drainage Tunnel
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PARKDALE
White Rock Creek Floodplain
Mill Creek / Peaks Branch / State Thomas Drainage Relief Tunnel