HERBERT HOOVER DIKE REHABILITATION PROJECT

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1 HERBERT HOOVER DIKE REHABILITATION PROJECT Update to the Broward County Water Advisory Board 19 September 2013 Ingrid Bon, PE Project Manager Forward

2 Initial Levees Along Lake Okeechobee Authorized by Congress as part of the Rivers and Harbors Act of 1930 Levees authorized as part of the navigation project Pahokee Pre & Post Construction 2

3 Congress Authorized Additional Construction in 1948 Congress authorized additional work in response to significant hurricane damages in 1946 and 1947 as part of the Central & Southern Florida Project (Flood Control Act of 1948) Existing levees were raised to provide an increase in the Lake Okeechobee regulation schedule 1964 Construction New levees were constructed in the northwest and the northeast shores of Lake Okeechobee The levees around the shores of Lake Okeechobee were renamed Herbert Hoover Dike 3

4 Herbert Hoover Dike 143 miles of embankment around Lake Okeechobee 32 Federal culverts 5 spillway inlets 5 spillway outlets 9 navigation locks 9 pump stations Height: Avg width: 20 top/ 250 bottom Inflow capacity exceeds outflow capacity Drainage basin ~ 4,600 sq. miles 4

5 Embankment Internal erosion (seepage, piping) Through embankment Through foundation HHD Problems Piping Culvert Structures Erosion into the structure Erosion around the structure (piping) Sinkhole One of highest priorities in U.S.: Urgent & Compelling situation requiring significant and immediate action Probability of breach without intervention Lake Elevation (ft., NGVD) Combined Probability of HHD Breach (%) 15 1 Culvert deterioration (Table H-10.2, 1998 HHD MRR & LORS FEIS, A-3)

6 4 N 6 FISHEATING CREEK Moore Haven 8 Reach Boundary Town/City HHD Solutions Okeechobee SAND CUT Clewiston 2 5 Lake Okeechobee Lake Harbor Port Mayaca Canal Point Pahokee Belle Glade South Bay 3 7 Sand Cut 6 1 Major Rehabilitation Report (MRR) miles of embankment Divided into 8 reaches Reach 1 initial phase Reach 1 Rehab Plan Cut-off wall Seepage berm Culvert replacements Risk-Based Approach System-wide risk Prioritize implementation Cut-off wall and culvert replacements are riskreduction measures

7 Interim Risk Reduction Measures Lake Okeechobee Regulation Schedule (LORS 2008) Toe ditch filling Quarry backfill Culvert removal IPPC-1 & IPPC-2 Culvert rehabilitation FC-1 & HP-7 replacement HP-5 barrel lining Tree and unwanted vegetation removal HHD Emergency Action Plan (EAP) Emergency exercises and EAP updates Inspections Communication plan 7 7

8 Dam Safety Modification Study System-Wide Risk Reduction Approach Goal is to reduce the risk of failure Identify and address the highest risks first through the study Cut-off wall in Reach 1 and culvert replacements and removals are riskreduction features Seepage Management Test Facility (Pilot Test) Alternative risk-reduction feature for embankment and foundation seepage control Dam Safety Modification Study (DSMS) Study includes the entire 143-mile embankment and structures Multiple alternatives being developed and analyzed to reduce risk NEPA document will include alternatives developed within the DSMS Draft NEPA document available for public review in Summer 2014 Study approval in

9 Rehabilitation Progress Reach 1 Cut-off Wall MATOC 21.4 miles of installation completed in Reach 1 for $220M Water Control Structures (Culverts) Culvert 14 removal - $4.7M completed in May 2012 S-269 (C-11) & S-270 (C-16) - $44M, completion in Apr 2015 S-279 (C-1A) & S-280 (C-1) - $49M, completion in Nov 2015 S-276 (C-4A) & S-277 (C-3) - $25M, completion in Feb 2016 Culverts 7, 9 and TCC Abandonments - $4.7M completion in late 2014 FY 2013 Awards: 6 culvert replacements, Seepage Management Test Facility 9

10 TC Culvert Replacements, Removals, and Abandonments KEY FY Ongoing FY FY FY FY 2016 FY FY

11 S-269/ Culvert 11 Replacement Construction Start: March

12 Dike excavation August

13 New culvert construction November

14 New culvert construction January

15 New culvert construction March

16 New culvert construction April

17 New culvert construction May

18 New culvert construction June

19 New culvert construction July

20 New culvert construction August

21 U.S. Army Corps of Engineers Jacksonville District Web site On Facebook On YouTube! On Twitter On Flickr On Pinterest 21

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