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Home My WebLink AboutSS2 - Newport Harbor Entrance Tidal Gate Presentationr y s CBen C. Gerwick, Inc. a COWI company Ben C. Gerwick, Inc. // COWI North America Al M COWI N.A. M COWI N.A. Offices COWI Offices worldwide x, F t � ir 4 1 Z Ben C. Gerwick, Inc. a CON Company Over 90 years of expertise in heavy civil construction and design Ben C. Gerwick, Inc. > Internationally renowned engineering consulting firm HQ in Oakland, CA > History of creative solutions that minimize risk, cost, and time > Focused on constructability, serviceability, maintenance, and durability of structures in waterways and marine sites > Conceptual design, cost estimates planning, permitting, final design and construction support > Documentation & quality control > Decades of experience with government design criteria to streamline the approval and permitting process > Work is exemplified by New Orleans IHNC Floodgates, Braddock Dam, Olmsted Dam, and Chickamauga Lock. 3 Ben C. Gerwick, Inc. a COWI company Select projects > IHNC Lake Borgne Barrier (Design/ Constr. Supt.) > Montezuma Slough Salinity Barrier (Concept. Des./ Constr. Eng.) > Braddock Dam (Design/ Constr. Supt.) > Chickamauga Lock (Design/ Constr. Eng.) > Olmsted Lock and Dam (Design/ Constr. Eng.) > Venice Storm Surge Barrier (Conceptual Des.) 4 Ben C. Gerwick, Inc. a COWI company IHNC Hurricane Protection Project New Orleans, Louisiana > Gerwick is the Lead Designer for the $1.3- billion design -build contract for the USACE Hurricane Protection Office. The barrier reduces the risk of damage from 100 -year and 500 - year storms. > Gerwick designs: 150' Swing Gate, GIWW Sector Gate Monolith, Approach Walls, and the flood wall itself. > Gerwick provided construction support, on -site staff for project duration, cost estimating assistance, management of mech. subs, QC, and documentation. Sector Gate (150') & Swing 5 17 JANUARY 2013 Ben C. Gerwick, Inc. TIDELANDS MANAGEMENT COMMITTEE a COWI company Gerwick's concept allowed for in- the -wet methods to expedite construction IHNC Hurricane Storm Damage Risk Reduction System 6 17 JANUARY 2013 Ben C. Gerwick, Inc. TIDELANDS MANAGEMENT COMMITTEE a CON company Flood Wall Construction - August 2009 36" Diameter Steel Piles Driven to EL -190 ft ly ^N°^ 2013 Ben C. Gerwick, Inc. 7 rnoe; ANDS MANACEPIENT COMNli r E a CON company IHNC Gate Structures at Gulf Intracoastal Waterway (GIWW) 1I JANUARY ANA Ben C. 6erwick, Inc. 8 TIDELANDS MANAGEMENT CDMMITT[E a COWI company Construction sequence - January 2011 IHNC Swing Gate Tow to Site - January 2011 9 17 JANUARY 2013 Ben C. Gerwick, Inc. TIDELANDS MANAGEMENT COMMITTEE a CON Company A cost efficiency review IHNC Floodwall vs. Existing and Proposed Barriers Gerwick's base case barrier as a unit cost of Lake Borgne $0.75 billion / mile St Petersburg Proposed NY -NJ CH2MHill barrier NY -NJ (concept only) Oosterscheld Maeslant River Thames tidal I barrier in London, UK Thames 17 JANUARY 2013 1 TIDELANDS MANAGEMENT COMMITTEE I 11 I 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 ($ billion 1 mile) Ben C. 6erwick, Inc. a COW company I I I I I I I N ; I I I I 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 ($ billion 1 mile) Ben C. 6erwick, Inc. a COW company 1�� N 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 ($ billion 1 mile) Ben C. 6erwick, Inc. a COW company Montezuma Slough Salinity Barrier Complex Radial gate structure for Salinity Barrier in the California Delta. Offsite prefabrication & float -in. 17 JANUARY 2013 Ben C. Gerwick, Inc. 1� TIDELANDS MANAGEMENT COMP ➢i EE a COWI company Braddock Dam r� %Vww. pianc. org ,o P� Ben C. Gerwick, Inc. a CON Company Chickamauga Lock Lift -in Construction Towing a Lift -in Cofferdam Box Segment to the Site Ben C. Cerwick, Inc. a CON company Mechanically Operated Wicket Gate at Olmsted Dam FLOW LL .-14.00 EL. 215.14 14 ,r sarE F1. +14.99 k:CEEi n, Yor , t PIN EL_ +3.410 i PROP �yONS! g x(MCC P 1 N EL. -15.15 N.w. PASS Axl5 Plate; The wicket Gates can he raised up and lower down 4, 1. Gantry crane (not shown for cla rity) 2. Moving actuator 3. Boat E- - -17.12 Ben C. Gerwick, Inc. a COWI company Venice Storm Surge Barrier 01#I10014 1 17 JANUARY 2013 TIDELANDS MANAGEMENT COMMITTEE Compressed air is used to raise gates during a storm. Gerwick performed detailed constructability review for this project. iQ Ben C. CePWIck, Inc. a COWI company IC* Ben C. Gerwick, Inc. a CON company Wicket Gate (Raised) 1 TI ELAND JANUARY ANA Ben C. Gerwick, Inc. TIDELANDS MANAGEMENT COMMITTEE a COWI company Wicket Gate (Raised) Protected Side Piles Driven "in- the -wet" 1 17 JANUARY 2013 TIDELANDS MANAGEMENT COMMITTEE Flood Side Flap Gate: Steel or lightweight concrete Sheet Pile Wall Driven "in -the- wet" Ben C. Gerwick, Inc. a COWI company Wicket Gate (Stowed) 1 > ^ 17 JANUARY 2013 TIDELANDS MANAGEMENT COMMITTEE Steel Props rest within Hurter Troughs Ben C. Gerwick, Inc. a COWI company Inflatable Flap Gate (Obermeyer Type) 20 17 JANUARY 2013 TIDELANDS MANAGEMENT COMMITTEE Ben C. Gerwick, Inc. a CON company Schematic Obermeyer Bottom Hinge Gate Ob4 mycrdatewith Prcp Y 3 Ben C. CePWIck, Inc. 21 TIDELAND DELANDELAND S MAA NAGEMENT COMMITTEE a COWI company Flap Gate with Hydraulic Prop zz TIDELAND Y S MAA 3 NAGEMENT COMMITTEE Ben C. Gerwick, Inc. TI a COWI company Buoyant Flap Gate (Venice) Z3 v JANUARY 2013 Ben C. Gerwick, Inc. TIDELANDS MANAGEMENT COMMITTEE a CON Company Advantages of In- the -Wet Construction > Limited or no channel closure during construction > Modular, floating elements lend themselves to design of the closure as an adaptive structure > 50 -foot wide units can be designed to built on grounded barges Representative construction site for grounded barges 17 JANUARY 2013 Z e TI DELAND S MANAGEMENT COMMITTEE Ben C. CePWIck, Inc. a COWI company Salinity Control Advantages of Flap & Rising Sector Gates > Rising Sector Gates and Flap Gates rise from the bottom of the channel > They can be partially raised during a rising tide to form a salinity barrier against the intrusion of the dense, salt water ZS 17 JANUARY 2013 Ben C. Gerwick, Inc. TIDELANDS MANAGEMENT COMMITTEE a CON company is Ben C. Gerwick, Inc. a CON company Feasibility study Newport Harbor Floodgate Concept > Primary goals > Comprehensive defense system against high tide events and other hazards > Key advantages over sheet -pile walls > Aesthetically minimally invasive > Cost - effective with an exceptionally low footprint > Minimum disruption of tidal hydrodynamics and on- demand activation > Proven, reliable tidal gate technology > Well- defined maintenance frameworks > Adaptive design with ample opportunities for future upgrades 27 17 JANUARY 2013 Ben C. Gerwick, Inc. TIDELANDS MANAGEMENT COMMITTEE a CON company Impact of rising tides Flooding and Inundations > Major flooding events caused by interaction between: > Very high astronomical tides ( "King tides "; see pictures) - Annual events > Storm surge (storm tide) - Fairly limited on West Coast > Wave set -up (mostly on exposed areas) > Rainfall and run -off > Sea -level rise > Influence of change in sea -level on total water levels may not be neutral because of large contribution of astronomical component 1I ELAND JANUARY ANA � Ben C. Gerwick, Inc. Z$ TIDELANDS MANAGEMENT COMMITTEE a COWI company E a C 0 4 U s J +R VY 15- IC}- 09 SLR Contributions to 2004 glaciers and small 1965 1970 Antarctic & Creenland ire sheet deep ocean thermal expansion terrestrial storage Lrface thermal expansion 1975 1980 1985 1990 1995 2000 Dace (Year) Ben C. Gerwick, Inc. a CON Company SLC SLR Projections > The indicated values are based on a 2009 report by V &R to the NAS, where A1FI, A2 and 131 scenario - based GCM SLR projections, are input for the High, Medium and Low Classes, respectively > In line with recently issued NRC 2012 recommendations for West Coast. 70 60 50 a 40 d ° 30 m W 20 10 0 -. Law `m d Medium _ — High m H 1.8 1.5 1.3 1. CO 0.8 a 0.5 0.3 0. 2030 2040 2050 2060 2070 2080 2090 2100 Year 70 60 50 a � 40 o a d 30 m 20 10 0 EC -1 EC —II _ EC —III 6 — VR Historical 1.8 1.5 1.3 E 1. 03 0.8 'o a 0.5 0.3 0. 2030 2040 2050 2060 2070 2080 2090 2100 Year 30 17 JANUARY 2013 Ben C. Lerwick, Inc. TIDELANDS MANAGEMENT COMMrrTEE a CON company Various Global Sea Level Rise Scenarios 7.0 ( r c 5.0 0 r A 4.0 m 3.0 c r V d d 2.0 V2 1.0 0.0 A- 2010 COPC High ■ COPC low • CA Coastal Conservancy — USACE /High — — USACE / Intermediate •••••• USACE /Low Vermeer and Rahmstorf Mean and Range Note, see text on Page 3.9 for descriptions of AI F/, A2, 81 and AR4 .000 .. .. — r . •. rr................ .............. 2020 2030 2040 2050 2060 2070 2080 2090 Year i 9's. i3t0:47 Comparison of USACE /High Projections of Sea Level Rise with the California Ocean Protection Council (COPC) and California State Coastal Conservancy Recommendations, and Vermeer and Rahmstorf (2009), (Adopted from Vermeer and Rahmstorf 2009) 17 JANUARY 2013 Ben C. Gerwick, Inc. 31 I TIDELANDS MANAGEMENT COMMITTEE a CON company NRC 2012 SLR Recommendations for West Coast > NRC 2012 guidance > In line with most recent projections > Key years: > 2030 > 2050 > 2100 > More conservative than IPCC 2007 projections > Publications for the West Coast > Location -based recommendations a > Southern Cal more exposed to SLR than Oregon /Washington where up- thrust & Glacial Ice Mass Loss from Alaska ^ dominate > No mention of sensitivity of tidal events on changes in baseline sea -level 3 17 JANUARY 2013 TIDELANDS MANAGEMENT COMMrfTEE -124 -12'J -116 M' 4' az• o so ,so - �• 3r wm�t" c Lcm7 URE S.1 Projected sea -level rise off California. Oregon. and Nashrngton for 2030 (blue), en). and 2100 (pink-), relative to 2000 as a function of latitude. Solid lines are the projections, led areas are the ranges. Ranges overlap. as indicated by the brown shading (low end of 2100 n high end of 2050 range) and blue -green shading (low end of 2050 range and high end of 2030 rar 1= Mendocino Triple Junction. where the San Andreas Fault meets the Cascadia Subduction Zone i@ Ben C. 6erwickr INC. a COWI company Timing of SLR Protection and Risk to the Community The Current Seawalls Do Not Meet FEMA's Criteria for the 0.2% Resiliency Case (EL over 11'); Thus Putting Restrictions on When Homes Need to be Elevated to the 1% BFE Case (El 9'). Businesses and Homes, sold or significantly upgraded, are Currently subjected up to a 25 0/o/yr NFIP Premium Rate Increase Until Market Rates Are Reached. Such Rate Increases Could be Mitigated Via FEMA's Community Rating System (CRS) If Adequate Protection (such as a floodgate) Is Provided. FEMA is Entitled to Change Both the 0.2% and the 1% Inundation Projections at Any Time, Not Only for SLR But Also for Increased Storm and Tidal Activity. Uncertainties About Future Criteria May Limit Current /Future Real Estate Prices Around Newport Harbor. The Floodgate Solution May Be California Coastal Commission, 33 Easier to Gain Approval from the Than High Sea Walls. Ben C. Gerwick, Inc. a CON company NOAA 2012 Global Sea Level Rise Scenarios 200 M M 160 d a a a E 120 0 CD w 80 m J [7 m 40 ra m R 0 0 0 -40 1901 1950 C)bserved scenarios 2000 Year 2050 Highest - 2.0 m Intermediate -High - 1.2 m Intermediate -Low - 0.5 m Lowest - 02 m 2100 34 Ben C. Gerwick, Inc. a COWI company SLR and Monthly Extremes > Some interaction exists between extreme water levels and a rise in base sea - level. > Historical volatility of tidal signal has increased over the past 90 years. > A rise in the magnitude of these extreme events may add to the linear contribution of sea -level change. > Historical data assessment highlights the need to establish solid design basis. m Q Z t m 'm `m 0 — Best fit. S3 RO 9 8 6 1950 2000 2050 2100 3 J C 17 JANUARY 2013 TIDELANDS MANAGEMENT COMMITTEE 8 7 6 5 4 J F 2 .. 0 —1 _Z —1.6 —1.4 —1.2 —1. —0.8 —0.6 —0.4 —0.2 0. 0.2 0.4 0.6 0.8 1 Storm title Ben C. Gerwick, Inc. a COWI company Combined Global SLR & Extreme Tide Heights 14 12 A m CK a z g ai w C v_ R �! dY 6 W F. 4 2 • AnnualMSL • AnnualMaxiieight .. MSLTrend .... .----------------- _. ............... _ ......... _ ..................... ......... . Annual Mac (Trend) — Annual Max (p•14%) Annual Max (p. 1 %) .. .... .. __ ....... ..._. __.._. ___._. 0 1920 1940 36 17 JANUARY 2013 TIDELANDS MANAGEMENT COMMITTEE • • • • '�• 1960 1980 2000 2020 2040 2060 2091 2100 Year Projections of Mean Sea Level and Extreme Tide Heights Through Year 2100 Ben C. Lerwick, Inc. Per Everest International Consultants, Inc. aCOwlcompany FEMA Flood Insurance Rate Map for Newport Harbor 37 v JANUARY 2013 Ben C. Gerwick, Inc. TIDELANDS MANAGEMENT COMMITTEE a CON Company Pacific Institute's Estimate of Current 1% Inundation (light blue) & Inundation with 55" of SLR (dark blue) Inundation and Risk 38 v JANUARY 2013 ( Ben C. Gerwick, Inc. TIDELANDS MANAGEMENT COMMITTEE a COWI company DFIRM for Balboa Island With a 1% & 0.2% Exceedance Elevation of EL +9 -ft & Over EL +11 -ft, Respectively N1 tBNt AL _ I ZCIE S .. C I� L b :. MI v ery .ower . 39 17 JANUARY 2013 TIDELANDS MANAGEMENT COMMITTEE ZC \E AE MAP SCALE 1' . !M' b0 IW EK. Ben C. Gerwick, Inc. a CON Company FIRM rLO MI [fart aV I U.IIUq]I\ v!r PAMEI ]I]OE Af S} wi •rafW FI{YwlYll I avuu��L III/IpA W -"_71 0ECEWE.3 XM Ben C. Gerwick, Inc. a CON Company 7.8 Top of Balboa Island Seawall Survey Results 8.4. • dsTw�r[ ®u. :ur I •SAS C i5C 3CC ;-.89 EARL AVE. 0.00 N 7,7 7.6 7,8 7.9 7.8 ST 9 V7.9 "7-S -_ i. •7.8 - 7.9 AVE. 0-00 8.3 8.3 8.0 8.4 5 8.2 -7.8 N83-2D-92 \7.8 &0 8.0, 8.4 8.5 8.5 8.5 LEGEND LOT BOUNDARIES STREET CENTERLINES OUTER SEAWALL o BENCHMARK • STATION MARKER • B.0- TOP OF SEAWALL ELEVATION IN FT, NAVDBB 8.2- TOP OF SEAWALL ELEVATION IN FT. MLLW (NTDE 8301; I F 8.6 1 . 8.6 8.7 8.9 8.7 8.8 BASE MAP PROWYDED 8Y CTTY OF NEWPORT BEACH Top of Seawall Survev Results 40 v JANUARY 2013 Ben C. Gerwick, Inc. TIDELANDS MANAGEMENT COMMITTEE a COWI Company `' =�.Y 8 -..- -- �8-7 � -6 $.9 8-S 8.6 7.8 9.3 8.0 9.0 8.3 8.6 9.2 9.5 9.0 8.5 8.6 8.6 8.7 8.7 8.8 8.6 9.3 9.5 8.6 8.8 9.1 8 -7 8.5 9.3 9.1 8.7 9.3 BASE MAP PROWYDED 8Y CTTY OF NEWPORT BEACH Top of Seawall Survev Results 40 v JANUARY 2013 Ben C. Gerwick, Inc. TIDELANDS MANAGEMENT COMMITTEE a COWI Company Tide Valve Locations in Newport Harbor Contours of ground elevation in the Newport Harbor area depicted by a DTM based on a 2006 LiDAR survey, and location of tide valves that prevent back - flooding through storm sewers. Note that annual inaximum high tides typically exceed 7 ft but fall short of 8 ft relative to NAVD 88. Heights bet-ween 6 and 7 ft appear pink. 41 I a Ben C. CePWIck, Inc. (from Flow Simulation, LLC, 2009) aCOWlcompany Newport Beach, CA - Tidal barrier Conceptual Design Basis 42 17 JANUARY 2013 TIDELANDS MANAGEMENT COMMITTEE Local Elevations, Risks of Inundation & Possible Mitigation Possible Addition of Asphalt Ridg 9 t Of Feet (NAVD 88) - -1,245 - -500 - -500- -100 - 100 - -10 -10 -0 iiii I� 0 - 3 = 3 -6 = 6 -9 9 -12 12 - 15 - 15-18 - 18 -20 43 Ben C. Gerwick, Inc. a COWI company IM, . .JC Possible Addition of 1' to Z' High Asphalt Ridge Near West Newport Park (with Tapered Approaches as Required to Accommodate Traffic) 1' to 2' High Asphalt Ridge Beach at El +16 to +18 Ben C. Gerwick, Inc. a CON company Turf and Clay Top Layer Details Used in The Netherlands sward stubble (2 cm) to rf herbage substrate OOts about ^' clay suitable for vegetation (often little erosion resistance) water level and frequency (approx-------------- 1 /10 year) erosron -sitar clay layer i grass cover top soil subsoil 1 core material normal high water (NHW) daily core water level ZZ undersoil • The Core May Be Granular, or Other Suitable Fill Material. • The Substrate May Be Erosion Resistant Clay, or Bentonite / Soil Mixture. top layer Asphalt Ridge Lido Residential Grass — Sand Berms Beachfront Whim Vulnerability to Inundation by storm We elevation in [8— MVD88] I . Gate 7 9 11 12 13 14 15 1e 17 FEMA Risk Areas and Jurisdiction Line High Risk Are A and V zones AE �< A V AH \ Moderate Risk Areas, 'Shaded X' zone Undetermined Risk Areas. D zone 'Shaded X' zone D zone No data available: Try the FEMA Map Service Certer ktp.11msc.fema.gov No Flood hazard data available in Google Earth Other information: jf/ Jurisdictions N Cross sections / FIRMs 0 LOMRs 47 v JANUARY 2013 Ben C. Gerwick, Inc. TIDELANDS MANAGEMENT CDMMCfTEE a CON company Overview of Proposed Location 48 Ben C. 6erwick, Inc. a COWI company Preliminary Design Considerations and Values > Design considerations > Current 1% Inundation EL 9' NAVD88 > Tidal Range (MHHW: 5.2', MSL: 1.5' NAVD88) > Sea Level Rise (Mean /Medium Guidance: 47" by 2100) > Local Settlement & Regional Subsidence (limited) > Soil Properties (use driven friction piles for foundation) > Nay. Channel: —900 ft. wide, 14' to 20' ft. deep, no overhead obstructions > Required freeboard: 1' -0" for Future Case 49 17 JANUARY 2013 TIDELANDS MANAGEMENT COMMITTEE Ben C. Gerwick, Inc. a COWI company Present Future Required top 15.0 15.0 of gate EL [ft] Flood side 9.0 13.0 water EL [ft] Protected side 6.0 6.0 water EL [ft] Channel -20.0 -20.0 bottom EL [ft] Top of foundation EL -20.0 -20.0 [ft] Ben C. Gerwick, Inc. a COWI company Conceptual 600 -ft Pass Bottom Hinge Gate Barrier so Ben C. Berwick, Inc. a COWI company Comparison of 600 -ft Pass & Proposed Tidal Water - Exchange Cross - Sectional Areas Office and Pump Statior Cutoff ME 30- ates Obermeyer Cut off Slide Gate Flood 51 j Ben C. Gerwick, Inc. a COWI company 41 Possible Obermeyer Bottom Hinge Gate Oheiine;ei Gate::itl.5traI_ 17 JANUARY 2013 Ben C. Lerwick, Inc. 52 I TIDELANDS MANAGEMENT COMMITTEE a COWI company Possible Wicket Gate Configuration iup 9r :,, rr Fl .+ arft--� FLOW rs � t EL. -20.00 v ICKET �L P1R EL- +3.00 PROP Note: The wicket Gates can he raised up and lower down by, 1. Gantry crane (not shown for clarity) 2. Moving actuator 3. Boat lift buckeye i HENCE. PIN_ EL. -22.15 \ HURTER I 0 - r� NAV. PA-SS AN IS - 2a -F% ELEVATION - RAISED WICKET GATE. 53 17 JANUARY 2013 Ben C. Gerwick, Inc. TIDELANDS MANAGEMENT COMMrrTEE a COWI Company Conceptual tidal barrier, open position 54 17 JANUARY 2013 Ben C. Gerwick, Inc. TIDELANDS MANAGEMENT COMMrfTEE a CON company Conceptual tidal barrier, closed position 55 17JANUARY 2013 Ben C. Gerwick, Inc. TIDELANDS MANAGEMENT COMMrfTEE a CON company Conceptual 400 -ft Pass Bottom Hinge Gate Barrier 56 17JANUARY 2013 Ben C. Gerwick, Inc. TIDELANDS MANAGEMENT COMMITTEE a CON company Next Steps A. Initiate Comparative Feasibility Study > Consistent, comprehensive cost performance comparison > "King tides ", SLR, run -up; hydrodynamics (tidal exchange, flushing, water quality) > Waves, basic performance requirements and benefits of rock armoring > Groundwater infiltration B. Identify Preferred Concept C. Work with Authorities to Finalize Concept D. Complete Final Design E. Bid and Construction V 17 JANUARY 2013 Ben C. Gerwick, Inc. 57 I TIDELANDS MANAGEMENT COMMITTEE co a COWI company A global firm with a local presence Gerwick Office Locations > Northern Cal. Oakland, CA 1300 Clay St., 7th Floor Oakland, CA 94612 Tel. (510) 839 -8972 > Dale Berner, PhD, PE deb@gerwick.com > Southern Cal. Long Beach, CA 3780 Kilroy Airport Way, #200 Long Beach, CA 90806 Tel. (562) 598 -9888 > Warren Stewart, PE, SE wnst @gerwick.com 58 17 JANUARY 2013 Ben C. Lerwick, Inc. TIDELANDS MANAGEMENT COMMITTEE a COWI company