2013 BARGE ALLISION AT MARSEILLES LOCK AND DAM MARSEILLES, ILLINOIS

Transcription

1 2013 BARGE ALLISION AT MARSEILLES LOCK AND DAM MARSEILLES, ILLINOIS ASCE ENVIRONMENTAL AND WATER RESOUCES CONFERENCE Toby Hunemuller Chief, Hydrologic Engineering Section 6 April 2017 The views, opinions and findings contained in this report are those of the authors(s) and should not be construed as an official Department of the Army position, policy or decision, unless so designated by other official documentation.

2 AGENDA 2 Site Overview & Maps 2013 Flood Event and Allision Emergency Response Recovery & Repairs Forensic Study

3 DEFINITION 3 Allision - maritime law. The running of one vessel against another. It is distinguished from collision in this, that the latter means the running of two vessels against each other (The Law Dictionary.org)

4 LOCATION 4

5 MARSEILLES LOCK AND DAM 5 Island Headraces Marseilles, IL Lock Dam Earthen Dike

6 EARTHEN DIKE Constructed as a feature of the dam Mitigate for pool created by the dam 3 to 5 feet high embankment Marseilles, IL 6 Earthen Dike Illinois River

7 DAM 7 Founded on competent shale Eight Tainter Gates Trunnion Anchor system Load transferred to pier Trunnion Beam and anchor system Post-stressed tendons Marseilles Dam Pool

8 THE EVENT 8 Marseilles USGS Flow Comparisons 120,000 USGS Apr2013 Provisional 110,000 USGS Sep2008 Observed 100,000 USGS Aug2007 Observed USGS May2002 Observed 90,000 80,000 Flow (CFS) 70,000 60,000 50,000 40,000 30,000 20,000 10,000 Date 26-May 24-May 22-May 20-May 18-May 16-May 14-May 12-May 10-May 8-May 6-May 4-May 2-May 30-Apr 28-Apr 26-Apr 24-Apr 22-Apr 20-Apr 18-Apr 16-Apr 14-Apr 12-Apr 10-Apr 0

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17 MARSEILLES FLOODING APRIL 19 Headrace s Loc k Dam Earth Dike

18 MARSEILLES FLOODING APRIL 19 Headrace s Loc k Dam Earth Dike

19 MARSEILLES FLOODING APRIL 19 1 P1 2 P2 3 P3 4 P4 5 P5 6 P6 7

20 MARSEILLES FLOODING APRIL P1 2 2 P2 3 3 P3 4 4 P4 5 5 P5 6 6 P6 7 7 P7 8 8

21 INITIAL ASSESSMENT APRIL 20 21

22 INITIAL ASSESSMENT - APRIL 20 22

23 DAMAGE SUMMARY & RESPONSE Public, commercial, and residential structures damaged WLS-TV Chicago News Story, Foundations collapsed, erosion of roads and yards 6 of 8 Tainter gates heavily damaged 2 Tainter gates inoperable with sunken barges Erosion of earthen dike Erosion around lock structure Erosion around the boiler house

24 NOW WHAT DO WE DO.. 24 Unified Command set up Coast Guard (lead), USACE and Navigation Industry Evaluate river forecasts and estimate discharges through the partially open gates Begin developing and refining hydraulic models Assess ways to stop flow through the dam and control pool, facilitate barge removal Assess flood risk and mitigation options due to inoperable gates Assess condition and damage to earthen dike Public meetings to communicate status and risks

25 NOW WHAT DO WE DO April barges impact dam 27 April begin work on rock dike 9 May bulkhead fabrication and earth dike repairs commence 14 May rock dike completion, navigation resumes 21 May public meeting to discuss flood risk 30 May begin raise of earth dike and rock dike 1 June complete raise of earth dike and rock dike 11 June downstream scour survey completed 17 June remove last barge 18 June upstream scour survey completed, bulkhead placed at Gate #2 27 June bulkhead placed at Gate #3 16 July rock work platform completed at Pier #2 1 August complete temp trunnion repair 1 August assessment of Gates #2 & #3 1 August complete trunnion assess field work

26 ROCK DIKE CONSTRUCTION April to 14 May Video

27 ROCK DIKE CONSTRUCTION 27

28 ROCK DIKE CONSTRUCTION RIVER DRAWDOWN PHOTOS 28

29 PREPARING FOR PUBLIC MTG 29

30 PUBLIC MEETING May Provide updates and best available information. 4 gates operational (thru July 2013) Timeframe contingent on barge removal, bulkhead placement, and rock dike removal Evaluation of measures to reduce flood risk Normal flows (42,000 cfs) passed at flat pool ft. 1 in 5 annual chance occurrence of a flood that exceeds the current low point (487.5) 1 in 10 annual chance occurrence of a flood that exceeds top of dike (488.6). Probability of overtopping (488.6) is 20 times greater with 4 gates operational than 8 gates operational. Provide the City with best estimate of discharges to implement voluntary / mandatory evacuation Monitor hydrologic conditions

31 RISK REDUCTION 31 Team evaluated ways to provide additional capacity for high flows to offset inoperable/damaged gates Reopen the mill race not feasible Emergency spillway over island not feasible Temporarily raise earthen dike HESCO s ~ Constructed 30 May 1 June Install temporary anchorage for gates 2 & 3 ~ 1 August

32 FINAL BARGE REMOVED June

33 BULKHEAD FABRICATION & INSTALLATION 33 Start: 9 May Install:18-27 June

34 TAINTER GATE INSPECTION & TEMPORARY ANCHORAGE 34 1 August

35 TAINTER GATE INSPECTION & DAMAGE 35 1 August

36 TAINTER GATE INSPECTION & DAMAGE 36

37 PERMANENT REPAIR CONTRACT - DAM 37 Replace 3 Tainter gates Repair 2 Tainter gates Fabricate & Install new Tainter gate anchorage New control/communications line from lock to dam Repair concrete piers Remove rock dike/platform material downstream of dam Solicitation and award dependent on funding Best value contract Gate repairs, fabrication & gate installation were key factors Ensure 6 gates were operable at all times Awarded 23 September 2014 Massman Construction Company $20.7M Wrapping up work this spring.

38 DAM REPAIRS TAINTER GATE ANCHORAGE BEAM 38

39 DAM REPAIRS TAINTER GATE ANCHORAGE BEAM 39

40 DAM REPAIRS - TAINTER GATES 40

41 PHASE I & PHASE II EARTHEN DIKE REPAIRS Phase I 9 May Repairs to restore integrity of dike Remove 20 trees Identify critical encroachments Phase II FY17 Award 41

42 PHASE II EARTHEN DIKE REPAIRS 42 Award FY17 Remove HESCO s Remove 42 trees Grub tree roots from Phase I Remove boat ramps Restore section & elevation

43 COSTS 43 Approximate Total Costs (Design, Construction, Oversight) Temporary repairs: $10 million Dam repairs: $25 million Earth Dike repairs: $8 million Total Cost: $43 million

44 FORENSIC ANALYSIS 44 Study to document, simulate and analyze the 2013 flood event HEC-RAS model with dam gate operations to simulate 2008 (calibration) and 2013 events Estimate the change in water surface due to barges and gate operations Surveillance footage to estimate gate operations and timing of event as it occurred Concluded 2013 event would have likely overtopped the earthen dike Magnitude and duration increased due to blockage caused by barges Gate operations to reduce outdraft would likely not increase overtopping (depth/duration) when compared to normal operations

45 QUESTIONS? 45