Parkdale / Lawnview Avenue Neighborhood - Dallas Documents/Mill...Tunnel Boring Machine (TBM)...

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