Mill Creek/ Peaks Branch/ State Thomas Drainage Relief Tunnel - PowerPoint PPT Presentation

Mill Creek/ Peaks Branch/ State Thomas Drainage Relief Tunnel Parkdale / Lawnview Avenue Neighborhood April 26, 2016

Mill Creek, Peaks Branch and State-Thomas Watersheds PARKDALE 2

Basin Characteristics  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 3

Mill Creek / Peaks Branch State-Thomas Background 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 4

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 5

Mill Creek and Peaks Branch History  Underground Storm Sewer Construction - 1930s  May 1995 Flood  March 2006 Flood  September 2007 Flood

May 1995 Flood Dallas Morning News Front Page May 7, 1995  Flooding businesses and homes  Baylor Emergency Room closed - flood damage $5M  Old City Park  Fair Park  IH 30 closed due to high water 7

March 2006 Flood  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

Mill Creek Flooding – Baylor Hospital Area Flooding March 19, 2006

Mill Creek Flooding – March 2006 Monticello Avenue – West of Greenville Avenue

Peaks Branch Flooding – March 2006 Zaragoza Elementary Flooding 11

Peaks Branch Flooding – March 2006 Worth Street Flooding 12

I-30 Flooding – March 2006

City Commissioned Studies  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) 14

2006 Plan – Mill Creek(1) / Middle Peaks Branch(2) and State Thomas(3) 3 2 1

Mill Creek/Peaks Branch/State Thomas Drainage Tunnel 16

Project Information  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 17

Mill Creek / Peaks Branch / State Thomas Drainage Relief Tunnel

Tunnel Profile

Drainage Relief Tunnel http://voteyesdallas.com/press-room-images.html

Tunnel Sections 30’x35.5’ HORSESHOE 30’ CIRCULAR MAIN TUNNEL SECTION MAIN TUNNEL SECTION OUTFALL TO SITE A SITE A TO END (2 MILES) (3 MILES) 21

Tunnel Boring Machine (TBM)

Deep Tunnel Construction Tunnel Boring Machine (TBM) Workers on a TBM after break-through • Minimal utility relocation Advantages to tunneling: • Reduced ROW acquisition • Minimal street replacement • Minimal traffic impacts 23

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 24

60% of the Areas Removed from 100-Year Flooding After Mill Creek, Peaks Branch and State-Thomas Tunnel is Constructed 25

White Rock Creek Drainage Area 26

Parkdale / Lawnview Concerns - Mill Creek / Peaks Branch / State Thomas Drainage Tunnel  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 27

PAR ARKDAL ALE White Rock Creek Floodplain 28

Mill Creek / Peaks Branch / State Thomas Drainage Relief Tunnel