HERBERT HOOVER DIKE REHABILITATION PROJECT Update to the Broward County Water Advisory Board 19 September 2013 Ingrid Bon, PE Project Manager Forward
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
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
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: 32 45 Avg width: 20 top/ 250 bottom Inflow capacity exceeds outflow capacity Drainage basin ~ 4,600 sq. miles 4
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 17 11 18 45 21 100 5 (Table H-10.2, 1998 HHD MRR & LORS FEIS, A-3)
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) 2000 143 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
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
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 2015 8
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
265 266 267 7 TC 268 9 Culvert Replacements, Removals, and Abandonments 290 291 KEY FY11 286 287 284 285 292 9 Ongoing 288 269 6 FY 2013 282 270 271 4 FY 2014 281 272 3 FY 2015 280 279 278 273 274 4 3 FY 2016 FY 2017 277 275 FY18 276 10
S-269/ Culvert 11 Replacement Construction Start: March 2012 11
Dike excavation August 2012 12
New culvert construction November 2012 13
New culvert construction January 2013 14
New culvert construction March 2013 15
New culvert construction April 2013 16
New culvert construction May 2013 17
New culvert construction June 2013 18
New culvert construction July 2013 19
New culvert construction August 2013 20
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