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

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

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

3 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

4 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

5 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

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

7 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

8 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

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

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

11 Peaks Branch Flooding March 2006 Zaragoza Elementary Flooding 11

12 Peaks Branch Flooding March 2006 Worth Street Flooding 12

13 I-30 Flooding March 2006

14 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

15 2006 Plan Mill Creek(1) / Middle Peaks Branch(2) and State Thomas(3) 3 2 1

16 Mill Creek/Peaks Branch/State Thomas Drainage Tunnel 16

17 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

18 Mill Creek / Peaks Branch / State Thomas Drainage Relief Tunnel

19 Tunnel Profile

20 Drainage Relief Tunnel

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

22 Tunnel Boring Machine (TBM)

23 Deep Tunnel Construction 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 23

24 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

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

26 White Rock Creek Drainage Area 26

27 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

28 PARKDALE White Rock Creek Floodplain 28

29 Mill Creek / Peaks Branch / State Thomas Drainage Relief Tunnel