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12/12/2023 Agenda i � ,� : '"i_A' AGENDA ,i. 'uI MONROE COUNTY RESILIENCE AND ROADS • ADAPTATION WORKSHOP December 12,2023 1:00 PM The Board will convene at the Murray E.Nelson Government Center 102050 Overseas Highway,Key Largo 33037 The meeting is open to the public. Members of the public can also attend will be via Communications Media Technology at: Zoom webinar: https://mcbocc.zoom.us/j/89204098700 To report problems with the broadcast or Zoom webinar,please call(305)872-8831. ADA ASSISTANCE: If you are a person with a disability who needs special accommodations in order to participate in this proceeding,please contact the County Administrator's Office, by phoning (305) 292-4441, between the hours of 8:30 a.m. - 5:00 p.m.,prior to the scheduled meeting; if you are hearing or voice impaired, call "711'. Live Closed Captioning is available via the MCTV portal @ https://cloud.castus.tv/vod/monroe/video/60832c9dcf67bb 7ac0c21791?page HOME&type=live for meetings of the Monroe County Board of County Commissioners. A person may submit written comments or other physical evidence on a particular agenda item for consideration at the BOCC meeting via email to Lindsey Ballard @ ballard-lindsey a monroecounty- flgov County Administrator's Office, no later than 3:00 PM. on the Monday prior to the meeting. The email must include the submitter's name, address, phone number and email address and the agenda item number the documents/comments are regarding. Any intellectual property submitted must include the appropriate authorization for use. For additional assistance,please call (305) 292- 4441 or email your inquiry to:ballard-lindsey a monroecounty fLgov. TIME APPROXIMATE 1:00 P.M. Call to Order Salute to Flag CALL TO ORDER SALUTE TO FLAG 1. TWIN LAKES ROADS ADAPTATION UPDATE V 2. ROAD ADAPTATION PROGRAM UPDATE V 3. STORMWATER REGULATIONS 4. STILLWRIGHT POINT ALTERNATIVES TECHNICAL EVALUATION ,✓ A. Alternative 1: Current project scope, schedule and cost: Elevation using 2045 sea level rise and king tide projections,with pumped drainage 1 vi B. Alternative 2:No adaptation project J C. Alternative 3: Add asphalt from 1 to 6 inches, no drainage J D. Alternative 4: Elevation using 2030 sea level rise and king tide projections, with gravity drainage only and no pumps V E. Alternative 5: Elevation using 2045 sea level rise and king tide predictions, with gravity drainage only and no pumps J 5. POLICY RECOMMENDATIONS FOR ALTERNATIVES J 6. FUNDING J 7. PUBLIC COMMENT V S. COMMISSION DISCUSSION AND NEXT STEPS 2 lvlo��IsHWE COUNTY F L C,P I V1, ..... EaiN L. Denur i=.n. w �¢ is changingResilience prepare for and adapt to to ithstand from disruptions , j Institute National Academies of j Science, Engineering and Medicine � i j Presentation Outline II�,, Twin Lakes Roads Adaptation Road Adaptation Program Update iiijol, Stormwater Regulations iii,, Stillwright Point AlternativesTechnical ��, Alternative I (Current r cScope, s e Elevation usingsea levelrise king tide projections, with pumped drainage) �iii,, Alternative 2 (No Adaptation Project with Continued Maintenance) uAlternative UluAlternative 4 (Elevation usingv rise j ctions, with gravity drainage pumps)only and no iiii, Alternative 5 Elevationusing sea levelrise i ide projections,with gravitydrainage only and no pumps) iim,, Policy1Alternatives im,, Funding IIimil, Public Comment / UViCommission Discussions yu VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV Twin Lakes Pro) ect Update Status Uimjll, Bid Phase Construction Phase k y r � r INaIYaWIbXf Paiu`& hp � �G r�(i iui (ili �(IH�r� �5 �INs6- rn r 5eyard& a' ro�tra ll"rrVa �' r� I W Mal Rl e � i -�aaururiiriiriiriiriirururiiriiriiriiriiriiriiriiriirual�iruril)) ))l)))Iyl� l)) i pe t i I r , , n -<t�mrya,ku�� 4 f f, v , J/PIJJI Jl. 1 Y 1 VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV SLR Related Planning Efforts I n Process1 . IIII IIII uuo uuo � �� IIIII III I li III IIIII /I \� m® - � u>Iu IIIIII I i IIIVIIIIII��u IIII ��. r„ / rr/ / r r / r / / r rr / r r / r/ / r/ r/ r/ r/ r/ r/ r/ r v/ r / r /r j r, I •County Roadway Vulnerability Analysi. VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV a�"" IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII • Projected Water Levels for YearU)-( s 2 t 2040, 2045, 2060, and 2100. • g r GMLS .............................................................................................................................................................. Sea Level Rise and Kin Tide Predict I • Roadway Li DAR • Storm surge Wind waves Extreme • Project water surface elevations • Conduct Vulnerability/Prioritization • Identify • When will areas be impacted • Define improvement project Assess environmental impac Develop preliminary cost est l SLR Pro ec Engineering Analys *s jec National Oceanic and Atmospheric Administration (NOAA) A Tot 2017 Sea Level Rise Scenario 5 . 5 ft Sea Level Rise Projections forC Morime aunty, Porida ® in 78 Yea W)AA 20 17 f rrjh N(VA 'X()1 Pnt H gh 7 &�� n.E,�„�� 6 ft +11 in "11001 +10.5 in 3 +1.5 in 0 // 01) e� 70 1.11 r%j r14 Mj 174 rN f,q ""J 17 � _ _ „/ Year // Ul ll SLR Condition: NOAA 2017 Intermediate High m VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV �� State Stormwater Regulations • Performance based evaluation i . e. each ect rop ] (any road modification) needs to be evaluated to determine drainage parameters so as to not cause adverse impacts to surrounding properties.SFWMD permit review and authorization will be required , for any modifications to a draina e system, and /or p changes to elevations im actin low patterns or g p g 1 impervious surface of the road increases requiring analysis of: (W � COOw�JR 1 j A� 4� W rr iiir, III i ji l ity ire tji'iir °II) wnaam,wmMry w�o�r�i�mo�w�wrquw,w�uwu�wau, is aww w ma;mwiwi,xwwn. w'wwa+ awa�awww'a�i�m��awra�,wa�umw�rw ;o ,/ IIII iiir Illl iiirTy � . carqpared Ilp Ilp r j ec iii ire 1 Illr d 4iiir,(Yrri iiir-a iiii lire a [ 1 IIII iiinn a r"try " ff [I �� • Types of permits to be evaluated include. 1 IIII x e iii rig f ,e in e,re 1. II1 lire idtjuia1 State Stormwater Regulations Cont , Water Quantity., • Determine water movement across the project area and identify low elevation points for capture, treatment and ........ � movement of rainfall. • Land use and soil conditions such as developed ro erties,, cm \ �r;sw"{ r` .. ... r, o-nrr�rvvrai vacant properties, pavement, grass, rock affect the I__-- �� _�a �.....�° .,e;� movement of the rainfall across the project area that gets TYPE b x ra uuuuuuuu°uiu O%//00//Ol//�� incorporated into the Hydraulic models. • Groundwater table conditions (King Tide and Sea Levelprfff Rise) to determine water storage capacity below the ground ;WI • Rainfall storm events to be evaluated (100-year and 25- year, 3 day and 5-year and 2-year, 1 day) Hydraulic Model (Pre vs. Post ) z No adverse impacts to offsite properties (i.e. �� ' cant flood neighbors properties or houses) ro IIIIIIII Illlidu i rrt/ i mil IIII / 1 1 /1 1 1 1 1 / 1 I f1 (11 (11 V 11 J(1� 1 I 1 Stormwater Collection 1 Treatment Disposal Design Criteria Proper Road longitudinal slope Proper Road cross sectional slope, Capacity and quality analysis Ground Surface to ground water table elevation difference Iioiiiji, Right of way width Two Stormwater Management Systems; loiuili, Gravity System Uiiiiij,, Pressurized System i Avalitable Rii-ght of Way makes. i differen IVj�ll��i y„ uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu �. SR 5/Overseas Hi h , 9 / r � . h , ur'� IIiJ 11 / Still right Point Community Right-of-Way J width varies from 15' to Avaitable Right of Way makes a differen 1051 ............... 50' o4 30' 0 0 ,; , I�lig[vt Of Way Of \A1qr Stormwater Management - Gravity Syste uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuui Key Factor: Ground Surface to ground water table elevation difference. H Florid-a's fimestone rousidation sera wall o salt water seeps under see Wal) through fimestone Stormwater Management - Gravity Syste uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuui French Drain Wiltration Trench French Dralin / Exfiltratiion Trench French Dra -xfiltration Trench Desi Design Meets SFWMD Criteria • How much water is being removed? • What is the Ground water elevation? ® How quickly can �he ground absorb the water? (Percolation rate) EMMPLE FRENCH DRAIN DESIGN&TREATMENT VOLUMES Perforated Analysis yields FD requirements: pipe Drainage System: I Length French Drain([CPR Link M'ame�:� PrFD2 • Trench Depth and Height Location j Sta.35+52.40RT 1777 777 Diameter Perforated pipe SHGWT EL(ft-NAVD): 1.00 Elevation Pipe Sze(41): 24 between Length of French Drain,t([_F) 18000 Pipe Thicinness(in): 'M)) top of `0 Pipe Invert EL,(ft.NAVD) -1.16 trench and Top of Trench EL(ft-NAVD)i 1.59 Bottom of Trench EL(ft-NAVD)� the ground 40, Trench Height,H (ft -13,41): 15.00 water I"',A, Weir CL(ft-NAVD) 1.59 ""'�"', .'�'" � �, ! ,, , Trench Height elevation® Trench Width,W(ft 4.50uuuuumuuuluum pil 61 0 Average Hydraulic Conductivity,X (cf s/ftl/ft-fiead) 1,160E.04 wo Depth to WaterTable,H,(ft)i 0.59 Non-Saturated Trench Depth,0,(ft) 0.59 Saturated Trench Depth,as(flit 1.4..41 J H,W, M6 2,9 0.70 fi 2: 0.35 204,D, 17,00 (139.10'jW0,; 0.00OM9 Trench Width P`DU D,and W<20i,,Treatment Provided,V(ac-En): 48.42 V= 211,./)k)-V.(L3t}t1Q1"a)D,{;j,j J. // / IfD,-Uv nd/orW-2Hr,TreatmcntProWded,V(ac in). 42.87 (1.39Y10 0,, 0,andW,2H,(Ye%/No):j No Treatment Volume Provided,V(Ac-ft 3�,57 Stormwater Management - Pressurized / Pum , VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV ugiiiiiipuuuuuuuuuuuuuuuuuuuuuuuuuuuiiiiiiiipuuuuuuuuuuuuuuuuuuuuuuuuuugiiiiiiip - Stati"'on System 40 ONCH AVk ....................... DDDiii ,, IN 4 ------------------- 10 OUlfAll ------------------------ Pump Station and Backup Generator 'FAR V FORM AJr JJ Hydrodynamic Separ Stormwater Management - i PIm Statibn System Injection Wells ON 0 g "n; INE, F OU Ufa A 0 F. A R'71S�4Z A"13% If rM, AM, ,,,.................................................................................................................................................................IN VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV 1 I I I u II IIIIII III I IIIIIIIIII 1111111 11 1 IIIIIIII Ill I I11111111 11111 11 1 I I 1 y I 1 11 1 Il 1 1 l 1 I I l 1 11 l 1 1 l 1 11! 11 U I J 1 I ! 11 1 1 11 1 1 J o �r r fig I i Stormwater Management - Summary IIIIIIIIIII�II��IIIIIIIIIIIIC�(fllllfffffllll�IIIIIIIIII��ullll��ou�'rr)�r)�r)�r�rrr)r�rr<rrrrrrr(rrrr)Ir��rr(((rrrrrrrrrrrr)r)rr��rrrrrrr�rrrrlr)r�rrrrrr�rr((rrrr)rrr�� III�IIIIIII��IIIIIIIIIIIIIIIIIIIIIffIIIIII�011lllllllllll��llllllllllllllllll(IIIIIIIII(IfIIIIIIIIII��Ifli��(IIIIIIII�IIIIIIIIIIIIIII��Illl�ill((Ildlllllllll((IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIC(IIIIIIIIIIIICIIIIIIIIIIIIIIII�I��IIICI��r Ability to move surface water under High Ground Low High Water Level conditions Increased Flexibility to Low High expand or improve system Dependency on existing topography (ground High Low i elevat on) Initial Investment Cost ($) Medium ($$) High ($$$) j Operation Et Maintenance 11111111 p Low ($) High ($$$) Cost ($) l ................................................. ....... Stit1wril"ght VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV Ground r e water r clearance dlilis ' 1 ii� r r r r, y JJyJJyJJyJJyJJyJ JJ JJyJ JyJJyJ yJJyJJyJJ y JyJJyJ yJJyJJyJJyJyJJyJJyJJyJJyJJyJJyJ /dill, J)I JJylyl J JIJ)111J1lJUylylllJUylylllJUyJ JJ1 JJJylIllUylyllllUylyllllUylyllllUylllllUylyllllUylyllllUylyllllUylyllllUylyllllUylyllllUll r1JJ% Typical Roadway Layersy 91 oil Existling Conditwns in Stil1wright Pol" iiiol�ilji, Challenging Existing Conditions: booAll water front properties i�iiji, Low roadway and private property elevation with high ground water elevations Uiiiiij,, Limited Right-of-way and number/location of Utilities Uii�ilji, Close proximity of residential ;;,„%if,,f, structures to the roadway Ineffective existing gravity drainag system (Seepage Trenches) Increasing Sea Level Rise conditions % 0 0 Exiistin Condiitmn ��``g in Stit [wright Pol" VVVVVVVVVVVVVVVVVVVVVVVVVVVV Existing Conditions / King Tide Flooding • Blackwater Sound NOAA tidal BUOY. Station that measures real time oceanographic and rain data. • Mean Sea Level (MSL) �,,�% �` � "',; recorded at -0.62' NAVD88 • Approximately 9" below the � !%� �� lowest road elevation point in Sexton Way. 114, On October 8, 2019 it J� �%%% ,;yf , ^ r � �m 1111111111111111111, reached 1 .03 NAVD88. 5 • Approximately 11 " above the lowest road elevation point in Sexton Way. o Pink highlighted areas denote areas that curr / Exi"Isting Condibions, in Stit [wright Poi f llj King Tide Flooding today vs consistent impacts from Perimeter Elevation Analysis SLR NOAA Intermediate-Hi h / r- projected, g ,,,�1.,,,,y� Kin Tide conditions. 1 /1 nparcels, natural Vacant atu al and b/w homes with EL. below �l ±1 5' N AVD88. 2025 - Consistent inflow of sea water through Vacant s, s, parcel natural area and b/w homes with EL. below r , ww 1 .37' NAVD88. (20 locations) ' 0 - Consistent inflow of sea water through Vacant parcels, natural areas, and f , ' - b/w homes with EL. below � 17 9' NAVD88. (6 locations) " 6 5 - Consistent inflow of sea water through Vacant a . parcels, natural areas and , � b/w homes with EL. below 2.26' NAVD88. 112 locations dy > -- -- - - > -- -- Atternative 1 Stil1wright Pcolint Current Project Upd VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV Design Contract Plans and Permitting (2045 SLR KT Projections) Currently in the Design Phase preparing the 30% Plans (March 2024) Anticipated Permitting Date: June 2024 - February 2025 Anticipated Design Completion: February 2025 Ewa,nNatione P�rk J11 NOWN"' R®R W1 17 mlrmlmm�, II 1 11111111111141 I I Atternative I - Current Project Scope, Schedute, a 9 Etevation using 2045 sea [eve[ rise and king tide p , „ with pumped drainage i Criteria Alternative 1- Current Project Scope, Schedule, and Cost: ; t' Elevation using 2045 sea level rise and king tide projections, with pumped drainage Roadway Max Elevation amount 2.18' being raised Potential Front Yard 0' to 8.5' Encroachment � Initial Investment 2023-$ $41 033 686.42* *2020-$ _ $20,195,708.31 UNIT COSTS OBTAINED FROM THE FDOT ITEM AVERAGE UNIT COST DATA BASE 12 MONTH AVERAGE FROM AUGUST 1 2022 TO JULY 31, 2023. / / Alternative 1 - Current Project Scope, Schedule, and m, level rise and king tide projections, with pumped drainage °°i uiiil III u I fuuuuuuu i� IuVlluu II vV u i i uuli� vv VVVV VVVVVVVVVVVVVVVV V�VVVVVVVVVV V�VVVVVVV V VVVVVV�VVV u� IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII� 1 Illl �llu IIILR"i ,;� ��rlllllllllllllli � r II '(r ti r r 1 Yl i/11✓,+r?%jJ./i!J/ rPr( W rii / II Alternative 1 - Current Project Scope, Schedule, and m, level rise and king tide projections, with pumped drainage uuuuuuullllil f f WC i iu� I rorrrr / /�� r.r�/r Sri /%/oi rrf l IIII ' , I ght Of Way �f r � / 1 i i f I � tn i t Elevation u � IVY sr appiroxilimatety above " g giiir Mbh / Ip . g. Alternative 1 - Current Project Scope, Schedule, and m, level rise and king tide projections, with pumped drainage uuuuuuullllil [Zig uuu VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV uuuuuuuuuuuuui I �uuu�uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu�u� �r h 0 f Way _; MS L: ououumuuuuuuuumuuuuuumuomumumumumumumumumumumummuuoumumuuuumumumumumumumumuuumumumuuuuuuuuuuuuuuuuuuuuumouuuuuuuuuuuuuuuouuuuuuumuuumuiouumuuuuuuuuuuuumuuuumuuuumumumuuuumuuuumuuuuuuuuuuuuumuouuioouuuuuuouuuuuuuuuuoumuuuuououiouuuuoumuoumuoumumuumuouuummuumuuouuuuuuuuuuuouououmuoummuiuouuuuouuuuuuuuumuuuuuuuuuuumiiuuuuumuuuumumumumuuuumuouuumuumuouuuuuuuouuouuuuuuumuuuuomuuuuuuuuuuuumumuoumuuuuumuoumiuuuuuumumuuuumuuuumuuuuumuomuuouuuumumuuuouuuuuuuuuuuuuuuumuuuuuuuuuuuuuuuuuumuuuououmuuuuuouuuuuuuuuumuouuuuouuuumuuuuuumuuuumuuuumumumuuuuuuuuumuiuuuuuuumuuumi -0.62' NAVD88 i 2025 King Tide ,projected to be .51 � A, 2 ' (N VD88}. i Approximately 7.5 of water above edge of roadway. m m m . �. s s • � m s I s s �:: Alternative 1 - Current Project Scope, Schedule, and m, projections,level rise and king tide with pumped drainage Iuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu�i IIIIIIIIIIIIIIIIIIIIIIIII IIIII y/Irdr�i�11� M I i h jf t i i i MSL: ' -0.62 NAVD88 uui uuuuuuuu , j j Atternative 2 OM Atternative 2 - No Adaptation Project with continu i i 1 IlllZi hu i ,,,,,, „.., r ✓,Grp� �-� .{J //� ,�i,,,,, ,,,,� �� r r1 Afternative 2 - No Adaptation Pro)",ect with contin�u i Iluuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuul i I 2025 Kira Tide prc�je�ted tc� be 9, u! �J,,„ RI j 2.51 Fr (NAV ), 1 Approximately 22,5" of water above edge of roadway, L i v., i II11 Atternative 3 Alternative 3 - A d as� . a ' w i W w i 1 6 "' , ir (o pppp IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII �' drainage ��Zighct Of Way cm 1 /� ��rlllllllllllllll Ir //� ' 4 �f wN r �w r>y a r ✓ ,,,/ / r/ / r in 17 � V , %. a o U IIIIIIIIIII (IIIIIIIIII IIIIII IIIIII IIIIIIIIIII III IIIIIIIIIIIII�IIIIIII�II IIIIII IIIIIIIII (IIIIIII IIIIIIIII IIIIII I IIIIIII�IIIII II II��II�Illilml II IIIIII Illlllnll�IIIIII�II��IIII�IIII III�I��r IIIIII II IIIIIII �III�III II��II IIIIIIIIII I IIIIII(III III�I IIIIII II IIIIIII II��II (IIIIIII II IIIIIII IIIIIIIIIII IIIIIII �IIII II III IIIIIIIII IIIIIIIII IIIIII II i Atternative 3 - Add . . i ifr W 6 "' , wU IIIIIIIII �' drainage Of IPlaveimeu%tIEl��.vatrion rarlsed Iby up to 6" �, a i i � g IIII Ii g 0 f Way ' IN i IU IIIIIIIIIIUI (IIIIIIIIII IIIIII IIIIII IIIIIIIIIII III IIIIIIIIIIIII�IIIIIII�II IIIIII IIIIIIIII (IIIIIII IIIIIIIII IIIIII I IIIIIII�IIIII II II��II Illlilml II IIIIII Illlllnll�IIIIII�II��IIII�IIII IIII��r IIIIII II IIIIIII �III�III II��II IIIIIIIIII I IIIIII IIII IIII IIIIII II IIIIIII II��II (IIIIIII II IIIIIII IIIIIIIIIII IIIIIII IIII II III IIIIIIIII IIIIIIIUI IIIIII II i Afternative 3 - Add . . i a rary"i 1 6 "' , wU IIIIIIIII �' drainage IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII 20L5 King Tide projected to be � 2.51 FT (NAVD88). Approximately 17" of water w above edge of roadway. IIIIi 0 f Way I I � I „u u i IIIIIIIIIII (IIIIIIIIII IIIIII IIIIII IIIIIIIIIII III IIIIIIIIIIIII�IIIIIII�II IIIIII IIIIIIIII (IIIIIII IIIIIIIII IIIIII I IIIIIII�IIIII II II��II Illlilml II IIIIII Illlllnll�IIIIII�II��IIII�IIII IIII��r IIIIII II IIIIIII �III�III II��II IIIIIIIIII I IIIIII IIII IIII IIIIII II IIIIIII II��II (IIIIIII II IIIIIII IIIIIIIIIII IIIIIII IIII II III IIIIIIIII IIIIIIIII IIIIII II i Atternative 4 uuuuu wi l Illl �llu f Alternative 4- Elevation using 2030 sea level �ri,se a projections, with gravity drainage only and no pu Gf ;;;;; ,f r r/ err �, r 1r/d�r✓rF <' o / rr�y U 1 r/ / /" ilt• I J� fir II r f / r r rr � /c / ni o 4 9 Alternative 4- Elevation using 2030 sea level �ri,se a projections, with gravity drainage only and no pu Illf�� IIIolf", IZigIIII 11'' Of Way Edge Of Pavement abo R Aevation iraised �by appiroAirnateLy 11.5" veesdinp g girOUnd Mth 11=irench Dirwins to bottom ,/ 1............................. 4 9 Alternative 4- Elevation using 2030 sea level �ri projections, with gravity drainage only and no pu Illh� 1,11'' Of Way <7 MSL: -0.62' NAVD88 2025 King Tide projected to be 2.51 FT (NAVD88). Approximatety 11" of water above edge of roadway. ................................................................................................................................................ ............ ..... 1 W li / �t a &- a m me cIit . 1fo an usajm s . ;m,�A, ell KI j k"11,11,16/4"I", wrl"IMimi L✓ 1IL i o ira,Aty 01", in o III jiiii ir ll ighct Of Way �R"i g Io t 0 f Way ti ✓ A IIG �/........... ... QW, � Ow A" It,! 7, o na kL 1 / s o" e......../ ,/�, III V HIM J r ira,v 4/0 no ,01 ........ I'll", Of Way Edge Of IPaveimenn. Id. vaboin iradsed Iby �f o� sir � dirrately 15" aboveeAsdin� girC)Uind wi lrm Fireindh IDirairrs � Ow/ A ", o na IC,! ........ kL 1 / s e........-'WW/�, III III V HIM iKr J r iram 4/0uluuuu no 5 �Iight Of 11'", Gf Way �0/00 MSL: -0.62' NAVD88 2025 King Tide projected to be 2.51 FT (NAVD88). Approximately 7.5" of water above edge of roadway. ................ 1 Stillwright Point Design Options.- IComparativef I Criteria Alternative 1- Current Alt. 2 - No Alternative 3- Alternative 4- Elevation Alternative 5- Project Scope, Schedule, Adaptation Add asphalt using 2030 sea level Elevation using 2045 and Cost: Elevation using Project with from 1 "- 6", rise and king tide sea level rise and 2045 sea level rise and continued no drainage projections, with king tide projections, king tide projections, maintenance gravity drainage only with gravity drainage with pumped drainage and no pumps only and no pumps Roadway Max Elevation 2.18' N/A 0.5' 1.38' 2.18' amount being raised Front Yard (ROW) 0' to 8.5' N/A No Impact 0' to 4.75' 0' to 9.5' Encroachment Initial Investment $41,033,686.42 N/A $2,587,062.17 $24,7277289.48 $26,418,101.77 (2023-$) Annual O&M Cost $ 17,662.00 -- TBD T O Roadway Storm Runoff Low High High Low (Short Term and Non- Low (Short Term and contributing to Private KT Season) Non-KT Season) III Property Flooding High (Long Term and High (Long Term and during KT Season) during KT Season) Roadway flooding Low High High Low (Short Term and Non- Low (Short Term and KT Season) Non-KT Season) High (Long Term and High (Long Term and during KT Season) during KT Season) j i i Policy Alternatives v. a ;o 1:111"" c es S�'uuwuum x&r o"If X 1111� mll nn rk Roads olll �iiij,, Policy 1502.1 .1 : Prior to incorporating a new project to the Capita[ Improvements Element, Monroe County s1.h a [..........a s s u ir. e. that it is reviewed for recommendations to -increase resih M climate —MRe, Jni:J:,u1cHn!:�i but not limited t ,, sea level rise and storm suer e® Monroe County shalt evaluate financial expenditures to fund repairs, reconditioning of deteriorating infrastructure and new infrastructure improvements within or proximate to vulnerable areas to manage public investments appropriately. Monroe County sha.U. -focus on level of servi // ce s.t a....n. d air s a n d...........fi 0 a i.n qj a I casts a i.n d 1b.en ef..J...t s for or a daptadoin, a p.oj n t s o.-f. gpp[y 'is, 'to assure -that infrastructure useful life and servie ectations can ,,,/ ............... ...................... be met in the face of climate change impacts. Ord. No. 013-2022 1 ), 8-17-2022) Jill I rUv C .Irmo. 11111 IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII ........yo I,` "' 1 i� o li�� c li e s IS uwu uuuuuuux a 11"', e o � /. uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu oiij,, Policy 1502.1 .5: By 2025, Monroe County shall initiate an inventory of existing and planned infrastructure up to the 2045 horizon, based upon the vulnerability mapping, updated elevation data, the Countywide Roads and Stormwater Vulnerability Assessment, the Watershed Management Plan, the GreenKeys Plan and other appropriate vulnerability information for g�a acity to accommo date jp-r- ectancy oft hat infrastructure. Monroe County shall identify the infrastructure within those ............................. areas, it useful Life and any retrofits or capital projects necessary to address the impacts of sea level rise. ....rhee stiratq,�ies im��iincludedefense, s........................................ tion or and relocatiol 1 projects, It bil accommi: Jaor no -planned -infrastructure -in vulnerable locations to address -the i pacts off sea lievelt / // � ,,,/ rise. Monroe Count 1 will consider devel des gin criteria Din- inction e. ............i.. .......... ..................................................... wit1h a lbiroadeir asset imainaggmgnj -2022 , 92 Ord. No. 0 13 8-17-2022) rUv C .Irmo. 11111 IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII ........yo I,` "' 1 i�('��I o li�� c li e s IS uwu uuuuuuux a 11"', e ovaidiiiro, � /. uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu oiij,, Policy 1502.1 .7: Monroe County shalt ensure that new, renovated and replacement public facilities and infrastructure, such as streets and bridges, water and wastewater treatment plants, police stations and fire stations, and any other public facilities that the County has authority over, are desigaed in a manner is considers -the useful life of public facilities and infrastructure. The County shalt also consider the .potentialjn3paq�� ............................. flood risk, climate chanee, inctudine rising sea levels and shoreline stabilization needs, on its infrastructure and public facilities. Ord. No. 013- 2022 , 5 2 (Exh. 1 ), 8-17-2022) Sit'le ard I�V,111'1`.icy I a clood M i L a i o r jl"O k, ........�lw s ��f o a d s al of a, AAAAM Current and The average Whether there is Previous The number of projected flooding elevations of adequate County- maintenance vacant parcels more as future adjacent property owned right-of- activity/costs as where f tooding conditions change and if they are way to implement compared to will occur on them due to seasonal higher or lower the project similarly situated or they will be a high tide flooding than the road road segments conduit for / and/or sea level flooding on the rise road JJJ The amount of Whether it is cost Future Future ownership and Community county owned effective to performance/ maintenance of the views on 11" property in the complete the road effectiveness of road, the County or project neighborhood project in the solution given a adjacent property community potential design's owners? design j / limitations (gravity systems may be currently failing or wiU fail in the future) Jill," 0 ,�,,,,' a,,,,o ,, m u p,,, r�,a ,a, io,,,� l� �" � �d �, � l - �& l �w�y�Ill ��If III �� If��,Ill � �,,,� �� , � „ IllIII h �III �,�,��,��11 � ��„ ' 4 g oj,Flowage/ROW Easement to accommodate a hie-her/wider ro 0' ed :A ri ht to flood , privately owned land typically held by a government agency ' urity and recorded, that will allow the land to be flooded because road i e s stem or uuuuullll,uuuu i� a minimal drainage system, can flood nearby ROW during ratif;�,, activities within the easement area (no fill or physical struct structures privately constructed). Why? (provide more County right-of-way where roaay f stoirmwater irun off will dirain and Iprovidethe County Ipirotectioo fro"ture lawsuits alleging , road design with liirnited drainage system (or I0 diraiinage system) floods adjacent properties (site specific). 111 0 (snot flowage) easeimeint imay lbe needed to'p tentnally t' accommodate Ihiglher/wideir road. Source afphote: �p ,l learningAlessonsfdffi' /� o�Adiacent Property and Easement Fill Policy: People will not be able to park, improve or fill roads components%f r , property in easement areas and will need to limit to certain slopes any fill they place on their property to harmonize elevations with easement areas. Why?Those areas need to The j free of cars, improvements, fill and landscaping to Ipirovide drainage/water storage functions �G oi,i Si na e: Si na a indicating potential flooding hazards. Why? arns residents and visitors o g g g P g Y Ihazairdous flooding conditions. iijill,Real Estate Flood Disclosure: A required real estate disclosure for property sales where the R seller discloses to the buyer that the roads may flood, may only receive maintenance(no guarantee of future elevation)and that an easement (where needed) has been provided to M AY 111; the County. y? IPuts future buyeirs on notice managing expectations related-to ,,, lirncirea,�ed tidal flooding and other issues related to liirnitation of road design. IIIIIIIIluu, County Road Abandonment: Abandon the road to the abutting property ert`uttin roowners. � Y oa�r�000�uuuuuuuyuuuuuuu��lu�e y. All.11,ows Iprivate Iproperty owners to build a iroad p -it and maintain based on a eirirnitted design. GPI o Keys VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV ..........1� 0 0 c o n a t i o " Y[ o i a i f, C .V 1� e � aI I IIe . .PY 7, uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuW.1h qt...........i s..........i...-t.? A designation of areas where elevations are Low, right of way is constrained, flooding conditions are occurring now, routinely, and road designs (elevation and drainage) may not be able to meet service expectations. W—bY d.Q i.t..? A too[ that was used in another community to manage expectations and clarify how the County will evaluate projects in those "constrained" areas and manage future obligations and liability. 666ditiorill; orsen Resident, eak Surnmer Hav i Count Where would -it apply? In locations where .......................................................................................................................................... ........... the properties are tow elevation and the ROW is constrained (estimated less than 10 areas countywide)® ........................ ........................................................................................................ IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII W0L1 ,,"`,.d e IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII uuuuuuux&� r of on . .............e �r"if i�e IIII YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY iij,, New Policy defining what ECLs are (characteristics of low elevations, existing and predicted flood risk, limited right of way, etc.) im,,, Policy 1502.1.5: By 2025, Monroe County shall initiate an inventory of existing and planned infrastructure up to the 2045 horizon, based upon the vulnerability mapping, updated elevation data, the Countywide Roads and Stormwater Vulnerability Assessment, the Watershed Management Plan, the GreenKeys Plan and other appropriate vulnerability information for cap��Jtyjtoq accornirnodate._pro ected sea level rise over the life expg�;t?q �y of ....................... .................. ............ ........................... _J t.1h a t J n.-fl.r.4 s tr u c t u i.r..e... Monroe County shall identify the infrastructure within those areas, its useful life and any retrofits or capital projects im acts o nssary Ito adaddresstflihh(.��, of sea level ........ece.................................... ................................................p rise. 1 Ihese stirate Unclude defe.inse accommodation or and relocation pro acts. ttsoir // ............................ .............................................. ........ ......... ............................................................................................................................2..................................................................................................................................I........................................................................................................................................... not buildii iress the impacts of sea ............................................................................i level rise. Moniroe Count��wilhc;onside.wrde�velo in design i in with a ................................................................................................................................................................ .... ............ crite. ria, con j�.q. n c t J o n. ..................................... .. � // b ir...o a d eJr asset [n. a 0 Ord. No. 013-2022 , 5 2(Exh. 1), 8-17- In environ entally challenging locations the County shall evaluate the followingin consideri cement on pfgpg��ts �ecific real estate flood disclosures possible abandonment of roads and limits on future adaptation_proLects. ......................................................................................................... ........................ ........................................ I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I umwir� om uuwui� i uuumd uuuu»� /i IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII �' a n irr,., r. mrrr,, rrr orr r,� irrrr i�r,., o oo�� m„�! r.. >�;!p r r� !9 om�'vo a/ /imo, rrrrrrr fr rrrrrrr rr vv. / p o prr rro ��r, w�u..� irr o «0 rr rr/rr�ruo uo 0 0/J� prr�a irrrnrr 4mr �. � � rrr � r �// � � � �� r,« uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu � ' �r ' �,,rr, �,,,,,1, ,r,,, �� ,,,J �� ,v,,,, �r,,,,//lll, „rf ,,,,�,,yJ / liii. rivoic iavo rE uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu uuuuuuu VVVVV ii loliljii, Generally, n road projects Countywide: oiiii, Policy on "site and policy factors" considered in road design project evaluation Et modify current Q � Cade on road design standards uijol, Real Estate Flood disclosure language included in Code Road Flood Signage Program w Modify road abandonment ordinance r Uiuo Modify fill policy to address harmonizing with right o a needs for roaddesign r �rrr r iiijo, Flowage easement policy Envi ronmentatty Challenging Locations Designation (in approx. 10 locations throughout IIII, Source: https://www.accuweath 11,11 County) Comp Plan Policies for what ill evaluated In these locations news/drenching-storms-produce-widesprea strand-motorists-in-northeast/1555674 im,,, In these areas, the policy olic recommendations listed above would be more specific to address elevation, right of way needs and design limitations r / y� Poticy R eco e datmm n � • Road designed not • Real estate • Policy recognizes design may be for Current project flood outside of disclosure impacted in the long term and existing County manages expectations Pumped System and right of way(2045) • Fill policy • Right of way easement to Elevation to 2045 Alt,. 1 \ •Addresses high and • ROW Easement accommodate higher/wider road 1 • seasonal King Tides (maybe not (2045), but flowage) • Private property fill prohibited in declining over a easement area (if needed) Existing Conditions: longer period of time as sea levels • Real estate disclosure manages iii, Prolonged flooding during rain events and seasonal King Tides increase transparency so future buyers understand the future flooding VUi Periodic Flooding during high tides • Return on risks and possible long-term Vu Conditions will degrade investment impact to project design over achieved fora time. Design Elements: longer period of time I�. Road base may be modified Elevation as designed for a 2045 future flood condition Pumped system to manage stormwater Pros and Cons: �iii, Regulatory triggers, pumped drainage requires addition� cost, avoids flooding adjacent properties and mana� stormwater �;� / / / / i PofiyRecommendation cs • Road may flood Environmentally • 1) County implements no adaptation for No Adaptation outside existing Challenging response& continues to maintain the road Project (Alt � ) County right of Designation OR 2) County can abandon it to adjacent • way (possibly abandon property owners(future adaptation project road) design and cost determined by community • No benefits because it will be a private road). addressing • Flowage easement Existing Conditions: rainfall, routine need is uncertain • Flowage easement need and status is i Prolonged flooding during rain events Et seasonal high and seasonal uncertain IlKing Tides King Tides • Real estate flooding now disclosure • Private property fill prohibited in existing iijo Periodic Flooding during high tides right-of-way Conditions will degrade • Fill policy ��" g • Real estate disclosure manages Design Elements: • Signage transparency so future buyers understand there is no a ectation for any level of oi, Road not modified service beyond routine maintenance, it oj,,Maintenance only (cracks, potholes, resurfacing) advises of current and future tidal flooding will be needed more often (if County does not risks and increasing flooding over time. abandon road maintenance cost will increase over time) Pros and Cons: iii,No regulatory triggers, cheaper (maintenance only), could create runoff issues on adjacent properties requiring flowage easements on some properties fr �;� / / / / i PofiyRecommendation cs • Road may flood Environmentally • Policy recognizes limited design for 1 - 6 Inches of outside existing Challenging now/manages expectations where 1) Pavement (Alt 3 ) County right of Designation County limits adaptation response to this way (possibly abandon project only £t continues to maintain the road) road OR 2) County can improve road now •Minimal benefits and abandon it to adjacent property addressing •May need Flowage owners(future adaptation project design Existing Conditions: rainfall, routine easement based and cost determined by community high and seasonal on site-specific because it will be a private road). Viii Prolonged flooding during rain events Et seasonal King Tides conditions King Tides flooding now • Flowage easement allows stormwater run- Periodic Flooding during high tides • Real estate off to be accommodated in expanded • Return on disclosure County right-of-way where necessary(site Vu Conditions will degrade investment may specific, maybe not all properties) not be realized at • Fill policy Design Elements: all upon • Private property fill prohibited in flowage construction • Signage easement area (if easement needed) ooi Road base not modified completion (road may still flood • Real estate disclosure manages Iliu��Some pavement elevation varying 1-6" of that same year) transparency so future buyers understand pavement depending on adjacent property elevation the adopted design constraints, but forthis Pros and Cons: desi n, it advises of current and future tidal flooding risks and diminishing Faster, minimal regulatory triggers, cheaper, could effectiveness of 1-6" pavement design over create runoff issues on adjacent properties requiring time. flowage easements on some properties // P � Recommendation of c for French Drains and ..........Road may flood • Environmentally • Policy recognizes limited Elevation to 2030 / 2045 utside of existing Challenging design/manages expectations where County right of way Designation County limits adaptation response to (Alt 4/ 5 ) (possibly) this project only Et continues to • Some benefits maintain the road addressing high •May need Flowage and seasonal King easement based on • Flowage easement allows stormwater Existing Conditions: Tides, but site-specific run-off to be accommodatedon declining over a conditions expanded County rig ht-of-waywhere Uj Prolonged flooding during rain events and seasonal King Tides mid range periods necessary(site specific, maybe not all i Periodic Flooding during high tides of time as sea • Real estate properties) °' levels increase disclosure Vi Conditions will degrade • Private property fill prohibited in • Return on • Fill policy flowageeasement area (if easement Design Elements: investment fora needed) oi,,Road base may be modified significant • Signage construction • Real estate disclosure manages oil,Elevation as designed for a 2030 or 2045 future flood condition project diminishes transparency so future buyers quickly understand the adopted design Uui French drains to manage stormwater constraints,but for this design, it Pros and Cons: advises of current and future tidal flooding risks and diminishing iii,French drains require additional costs, regulatory triggers,the � effectiveness of French Drain design aper than pumped system, could create runoff issues on over time. adjacent properties requiring flowage easements on some properties / Recommended Policies and Their , Application to Design Alternatives � »rr% s a i o i I yl r v I.fi d 'ry iP a V u duV V IVd o �� 1 1�r l 1 1 r ....................... r Alt. 1: Current l'�'lo 11,4110 Possible ROW Yes- advises of long-term No No project Pumped easement- flowage flooding impacts System easements uunl kety Alt. 2: No Yes Yes Uncertain Yes- advises of current/ Yes Possible Adaptation future flood impacts and Project road design limitations x 11111�°: Alt. 3: 1- :of des Yes Flowage on des- advises of current/ ; des U oss�k�l�,6 , g Pavement numerous future flood impacts an d road design limitations properties g Alt. 4/5: Yes Yes Possib e flowage Yes- advises of current/ Yes Possible French Drains easernent on some future flood impacts and properties road design [imitations r I///// l % ,,1 �f1f1f1f((fflllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllllll((I((I([Il��!�� i ;j I i Funding Chatlenge u Ion Increased project cost 1 Limited Grant Opportunities uiii, Potential State Grants iiim, Potential Federal Grants t' oiiij,,, Local Funding Uuu. County Revenue oiiij,� Assessments - Capital and OEM �� New Local Revenue - Potential Additional Penny Sales Tax � � i ;j PulbLi*� c Comment i ;j ;j i ;j 1 Stillwright Point Design Options.- IComparativef I Criteria Alternative 1- Current Alt. 2 - No Alternative 3- Alternative 4- Elevation Alternative 5- Project Scope, Schedule, Adaptation Add asphalt using 2030 sea level Elevation using 2045 and Cost: Elevation using Project with from 1 "- 6", rise and king tide sea level rise and 2045 sea level rise and continued no drainage projections, with king tide projections, king tide projections, maintenance gravity drainage only with gravity drainage with pumped drainage and no pumps only and no pumps Roadway Max Elevation 2.18' N/A 0.5' 1.38' 2.18' amount being raised Front Yard (ROW) 0' to 8.5' N/A No Impact 0' to 4.75' 0' to 9.5' Encroachment Initial Investment $41,033,686.42 N/A $2,587,062.17 $24,7277289.48 $26,418,101.77 (2023-$) Annual O&M Cost $ 17,662.00 -- TBD T O Roadway Storm Runoff Low High High Low (Short Term and Non- Low (Short Term and contributing to Private KT Season) Non-KT Season) III Property Flooding High (Long Term and High (Long Term and during KT Season) during KT Season) Roadway flooding Low High High Low (Short Term and Non- Low (Short Term and KT Season) Non-KT Season) High (Long Term and High (Long Term and during KT Season) during KT Season) j ° IIII II II uu�Iluuuuo�8 �� Yr�r rid r Ny rarur� � of <a e v r .,° �„ r� � -,. �,;,�= r„^."m a � �f-.. : l r7. �",. ,c,.�, '� 0 ,' �'it �,✓�ff 9�F/in,��r�.�rA+N(I�l� � ��Ae�'�d^'�'F � U�Y ��%; „-, �%ss, I�� NJ2�r�;��Hv�r� 1, f 6 (�Rll vqi<,;1i� � �'' � �,��a ,��v✓ ��+a��r��i��p Grassy Road - Gravity System u it ,,,,,; ............ ,, rr��rrrrr�lirr�rrrr��rr�rl�rrry�rrrrrrlr r r �r(rrrrrr�r( r, »�y�y�y»�y��Y��»19�1��y�y�y»�y�yiy»�y�y��iy1��y»iy��l��J/��yy�Y��y�y��9J�y»f�>>��i��l�l�y�y�y�� lY9ylyllly�llyllly�llyllly�llyllly�llyllly�llylll�/ylyl(ll/ylyl(ll/y� ,[[[[[[[[[[[[[�, 1PJ�J1rlJ11J�1)�)�1A1JJ1)y1JJ1JJ1)y1JJ1JJ1)y1JJ1JJ1)y1JJ1JJ1)y1JJ1JJ1)y1JJ1JJ1)y1Jl Alternative 1 - Current Project Scope, Schedule, and m, level rise and king tide °°i uiiil III u I�uuuuuuu I I IuVlluu II vV u i I uulil vv with pumped drainage VVVV VVVVVVVVVVVVVVVV V�VVVVVVVVVV V�VVVVVVV V VVVVVV�VVV projections, °uuuuuuu I I°uuuu°uuuuuuuuuuuuuuuuu I°uuuuuuuuuuuu luuuuuuuuuu°uuuuuuuuu°uuuu uuuuuuuu�� / 1 / � y r ,/ Ill/ 1 „I Ir gk,I II,I(I I . V a I .x, Of Way r m F f I I iM t r o 1i r r � w I / r r a to '✓ / ✓ / r � r,r„G �l ✓ a /r ,r / r rr rr ( Alternative 1 - Current Project . Scope, Schedule, and Cost-0, level rise and king tide. projections, , � uuuuuuuuuu uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu uuu uuuu i i r r IIII R.i PIIII I t Of , III r �� IIII IEdgE.� Ming' Wes. s • s • e e a m " !s • s ! � m • • � � s• Alternative 1 - Current Project Scope, Schedule, and Cost-0, Elev ation level rise and king tide projections, with pumped drainage III, MSL: -0.62' NAVD88 2025 King Tide projected to be /// 2.51 FT (NAVD88). Approximately 3" of water j / above edge of roadway. ............... ......................... Alternative 1 - Current Project Scope, Schedule, and Cost-0, Elev ation level rise and king tide projections, with pumped drainageuuuuuuullllil "t Of ()f Way MSL: -0.62' NAVD88 OM Afternative 2 - No Adaptation Pro)",ect with contin�u r / f �b Grr"v rp, 1 � r , m IRiI ml f Way F [Zi 1' f i i r ✓,r f g ti�,.,n: r. ✓ I ,, G r r r c m .r / J Y r r / z r ✓/ ...,.�$ i h ,�✓ / r/ � m rr 1 r a r fE 6 G �r r / ur / Afternative 2 - No Adaptation Pro)",ect with contin�u 2025 King Tide projected to be '"- 2,51 Fr (NA88), Approximately 8" of water above edge of roadway, i / i� Alternative 3 - Add w i a irary"i 1 6 "' , wU IIIIIIIII �' drainage... / � w i r , 1 m ............ Of f ',,,, � --.,,fie �✓ � /�� %/ // / % w, '. r,� ��' u ;;;; o �,r m� �,✓IT ��i✓ ii�/ �� i i o ii, r /� ,;,,,�;- ;; it [;€„ � �' f ,�, ;;%.f/ �✓ ✓ it /✓, � m ✓ � 6 ..,,, /// ,,, ,;�.. / ,G, � ..... `�' 1, i i ✓ ,�,, rv ✓ �, r /w � ,, ,� ,, ✓ ✓ ✓ i i� it .� ;�. ,. 1. „� / //. ✓l �i ez r" ✓. l � � � ,1 r i ti r 1 r� V � y ✓ /i, , b;, � � �� IIII �i�i� ��uu�i �uui�uu�iuu ui�ui uuuiiii ui��uui�ui�iuuu�ui�luui i�llu I�uuiu�ui�uuui uui�iu ui uuuuuuu�uui�ui ui�ui�uui� IIIIIII uuuui iglu a uu��iuu i i�i II��I�I a uui uuu uuu u�ii uuui�i�� I�iui�i �iuuii mi�u i�Yu �iiui i�uuui Ilui�iuuni iui i Vuui u�i uuuu a uiuu�iuu� i�llll i� of i�lllluu iglu a uuuiu� i Alternative 3 - Add w i a irary"i 1 6 "' , wU IIIIIIIII �' drainage �r e iglit Of Way ro r i i h uiui� ��uu�i �uui�uu�iuu ui�ui uuuiiii ui��uui�ui�iuuu�ui�luui i�llu I�uuiu�ui�uuui uui�iu ui uuuuuuu�uui�ui ui�ui�uui� IIIIIII uuuui iglu a uu��iuu i i�i II��I�I a uui uu�uu�u u�ii uuui�i�� I�iui�i �iuuii mi�u i�Yu �iiui i�uuui Ilui�iuuni iui i Vuui u�i uuuu a uiuu�iuu� i�llll i� of i�lllluii iglu�u uuuiu� i Afternative 3 - Add a . i a irary"i 1 - w 6 "' , rU IIIIIIIII �' drainage G�IIIIIIIIIIIIIIIIIIII uuuuuuuuuuuu� IIIIII VVVVVVVVVVVV Approximately 2" 0 water above edge of roadway, ; ZQ j �� IIIII( IIIIII „II b�ui� ��uu�i �uui�uu�iuu ui�ui uuuiiiiui��uui�ui�iuuu�ui�luui i�llu I�uuiu�ui�uuui uui�iu ui uuuuuuu�uui�ui ui�ui�uui� IIIIIII uuuui iglu a uu��iuu i i�i II��I�I a uui uu�uu�u u�ii uuui�i�� I�iui�i �iuuii mi�u i�Yu �iiui i�uuui Ilui�iuuni iui i Vuui u�i uuuu a uiuu�iuu� i�llll i� of i�lllluu iglu a uuuiu� i Alternative ® using 2030 i 11 .... .... IIIIIIIIIIIji'II ,se a uuuuu wi projections, with gravity drainage only and no pu , m i i / O r I i � r f / �.., .;„ „�iioi/„/ij�� ✓'j� ,;^ �,%�„,i�,,,i ,,,� i. 6�4 I h II� III i� H A IIII�� IIII I , III° � Of Way [[!; � r Jai/;; � %ice//��,:,; � r /.. i�//ii /// ;;��i ) •� � r Y u i G I pi I I. P / J ! / I a ,,,, r. ,....� ,. .r�...✓` 1. ,,, �, r i /. ,. ,. ,:/ r, o �„ i �, ,lei ✓ � � ii � ti i iw ��ryry pp axpp III �' �m � m � m•. � � � AW WA� i uuuuu wi r' Iluuuuuuuuuuuuuuuuu'', II� f� / 1 Alternative 4- Elevation using 2030 sea level �ri,se a projections, with gravity drainage only and no pu , ["Age Of Pavement [Jevat matches xns�dn �irOUn N YM III .� Illl m� Lull j IIII IIII�IIIII IIII IIII I IIII IIII III ICI III I IIIIIIIII IIIII�I I�I IIIII III I III I IIIIII Iliii � Alternative ® using 2030 uuuuu wY projections, with gravity drainage only and no p uuuuuuuuuuuuuuuuu iiiiiiiii I r r r MSL: -0.62' NAVD88 / 2025 King Tide projected to be 2.51 FT NAVD8 ) Aabovo edge of roadway. cr �y IIII IIII 1IIIII II11I IIII I IIII IIII III11 � @ICI III � I IIIIIIIII IIIII�I I�I IIIII III I III I IIIIII mil I -� A It,! A" a, o n kL 1 / su e........-'WW/�, III III V HIM iKr J r irav 4/0uluuuu no 'P, -J, Z, .......................................................................................... .......................................................................................................................... " Ow A � ua" he" J / , na �A kL 1 / s / //, :o" ......../ ,/ [ III III V HIM J r iram 4/0 no 'P, ft.to bottorn Jill � Ow A" IC,! kL7, o na �A 1 / s :o" e......../ ,/ III V HIM J r iram 4/0 no ,01 ! ..........�Zig�ht Of Way g I Way _............... MSL: -0.62' NAVD88 ' j 2025 King Tide projected to be 2.51 Fr (NAVD88). Approximately 3" of water above edge of roadway.