Roa d E le va tion Stra te g y a nd Ne ig hborhood Proje c t - - PowerPoint PPT Presentation

Roa d E le va tion Stra te g y a nd Ne ig hborhood Proje c t Prioritiza tion

Ja nua ry 21, 2020

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Me e ting Outline

• Purpo se
• Ja c o b s is fina lizing the ir re c o mme nda tio ns
• Our te a m is he re to liste n
• Use c o mme nts/ q ue stio ns re c e ive d to info rm fina l re c o mme nda tio ns
• Pro viding a c o mme nt
• Spe a k during the me e ting , o r
• Sub mit c o mme nts/ q ue stio ns a fte r the me e ting
• Co mme nt g ro und rule s during me e ting :
• F
• rm a line to a sk a c o mme nt/ q ue stio n
• Spe a ke rs a re limite d to 2 minute s
• Online vie we rs e ma il q ue stio ns to : MBRising Ab o ve @ mia mib e a c hfl.g o v

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Comme nts Afte r the Me e ting

• Ope n c o mme nt pe rio d thro ug h Ja nua ry 24, 2020
• Que stio ns o n Citywide Sto rmwa te r Ma na g e me nt? Ple a se c o nta c t:

L iz Be llo- Ma tthe ws

Pub lic I nfo rma tio n Offic e r – Pub lic Wo rks De pa rtme nt 305-673-7000 e xt. 6902 E

• ma il: L

izBe llo -Ma tthe ws@ mia mib e a c hfl.g o v

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Proje c t L e a de rship

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Matt Alvarez

Project Manager years

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Juan Aceituno

Deputy Project Manager/ Implementation Task Lead years

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Laurens van der Tak

Climate Adaptation Advisory Panel years

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Jason Bird

Planning Task Lead years

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Joe Rozza

Blue-Green & Sustainability years

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Monica Diaz

Public Outreach years

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Ag e nda

• Ro a d E

le va tio n Stra te g y

• Ne ig hb o rho o d Pro je c t Prio ritiza tio n
• Me tho do lo g y a nd Crite ria
• Que stio ns a nd Co mme nts

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T a sk 2

Ro a d E le va tio n Stra te g y

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Wa te r se e ks its own le ve l

On sunny da ys, g ro undwa te r le ve ls b e lo w Mia mi Be a c h rise a nd fa ll with se a le ve l, b e c a use lime sto ne g e o lo g y c o nne c ts the

• c e a n a nd g ro undwa te r.

Se a L e ve l Groundwa te r

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Backflow Seepage

T ida l flooding is proble ma tic in low- lying a re a s

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Drainage

T ida l F looding inc re a se d with Ra infa ll

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L

• ng T

e rm Stra te g y inc lude s E le va te d Roa ds, Se a Wa lls a nd Pumps

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ATLANTIC OCEAN INDIAN CREEK BISCAYNE BAY

Ra ising roa ds is a n importa nt stra te g y to a ddre ss sunny da y tida l flooding in public rig ht- of- wa y

• T

hro ug h sto rm dra ins

• T

hro ug h g ro undwa te r

• T

hro ug h o ve rto pping o f c o a sta l b a rrie rs (e .g ., se a wa lls)

• E

xa c e rb a te d b y Se a L e ve l Rise (SL R)

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Roa d E le va tion Stra te g y Ove rvie w

• Inte nt of Upda te d Polic y
• I

nc o rpo ra te upda te d tide da ta a nd SL R pro je c tio ns

• I

mpro ve ha rmo niza tio n with priva te pro pe rty

• Curre nt Polic y
• Minimum ro a d c ro wn e le va tio n fo r a ll ro a ds: 3.7 ft NAVD (e sta b lishe d

2014)

• Dra ft Polic y Approa c h
• F

le xib le de sig n o ptio ns to a ddre ss lo c a l ne e ds a nd c o nditio ns

• Addre ss a c c e ss, sto rmwa te r, a nd a e sthe tic s while re duc ing flo o d risk
• T

ie re d ro a d e le va tio ns b a se d o n ro a d c la ssific a tio n

• Alte rna tive stra te g ie s to de sig n ro a d e le va tio n b e lo w minimum e le va tio n

c rite ria if c o nstra ine d b y ha rmo niza tio n with priva te pro pe rty

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ROADWAY HARMONIZATION: A roadway design approach that maintains private property access, stormwater management, and neighborhood aesthetics through adaptable design standards.

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Guiding Princ iple s of Ne w Roa d Ra ising Stra te g y

• Suppo rt ke e ping ro a d surfa c e s a b o ve the king tide e le va tio n to a vo id

sunny da y tida l flo o ding

• E

sta b lish ne w minimum e le va tio ns fo r City ro a ds b a se d o n upda te d tida l re c o rds a nd SL R pro je c tio ns

• Addre ss inc re a sing g ro undwa te r e le va tio ns a nd c o nc e rn fo r po o r

pa ve me nt pe rfo rma nc e , inc luding pre ma ture pa ve me nt fa ilure re la te d to sa tura te d ro a d b a se

• Addre ss c o nc e rn fo r priva te pro pe rty ha rmo niza tio n
• Sta nda rdize a pplic a tio n so po lic y is unb ia se d, o b je c tive , a nd

tra nspa re nt

• Co nside r c o st implic a tio ns

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Ke y F a c tors tha t Influe nc e d Curre nt 2014 Roa d E le va tion De sig n Guide line s

Re c omme nde d Roa d E le va tion = A + B + C

• A. Histo ric a l “K

ing T ide ” = 1.7 ft NAVD*

• B. Se a L

e ve l Rise fo r a ssume d Se rvic e L ife o f 30 ye a rs: 1.0 ft

• C. F

re e b o a rd (1 ft a ssume d fo r ro a d c ro ss- slo pe , dra ina g e , a nd ro a d b a se )

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Curre nt Roa d E le va tion Stra te g y, De ve lope d in 2014

CROWN OF ROAD ELEVATION ensures that the highest point of the road and important infrastructure is above rising tides.

*NAVD = No rth Ame ric a n Ve rtic a l Da tum

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Summa ry of Ke y F a c tors tha t De te rmine Minimum Roa d E le va tion Crite ria

• E

va lua te s e le va tio ns a t e dg e o f ro a d (E OR), no t c ro wn, a nd a t b o tto m

• f ro a d b a se (BORB), a nd pic ks the mo st pro te c tive sta nda rd
• Assume s 30-ye a r ro a d se rvic e life
• Upda te d Se a L

e ve l Rise pro je c tio ns

• T

a rg e t fre q ue nc y o f flo o ding (a pplie s a t e nd o f ro a d se rvic e life ):

• L
• c a l Roa ds: 50% c ha nc e pe r ye a r (inc lude s ro a ds c la ssifie d b y City a s

“L

• c a l”, mo stly re side ntia l ro a ds)
• Ma jor Roa ds: 20% c ha nc e pe r ye a r (inc lude s ro a ds suc h a s Wa shing to n

Ave . c la ssifie d a s “Mino r Arte ria l” a nd “Mino r Co lle c to r”)

• E

me rg e nc y Roa ds: 10% c ha nc e pe r ye a r (inc lude s ro a ds suc h a s Alto n Rd.

c la ssifie d a s “E va c ua tio n Ro ute a nd a c c e ss to F irst Re spo nde rs)

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Upda te d de c ision proc e ss c a lc ula te s minimum roa d e le va tions a t two points on roa d se c tion

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Ca lc ula tion Me thod 1: L imite d F looding a t E dg e of Roa d (E OR)

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Measured Tides (1994-2019) at Virginia Key (ft NAVD)

Tide and Sea Level (ft NAVD)

Long-Term Water Surface Elevation Data at Virginia Key (25 years of hourly data) is used to estimate probability of water elevations being exceeded.

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Ca lc ula tion Me thod 1: L imite d F looding a t E dg e of Roa d (E OR)

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Water Surface Elevation at Virginia Key (ft NAVD)

Water Surface Elevation (ft NAVD) Annual Exceedance Probability

2.34 ft water elevation has 20% chance

• f being exceeded in any year

(on average, once every 5 years).

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Ca lc ula tion Me thod 1: L imite d F looding a t E dg e of Roa d (E OR) re sults in E OR Minimum E le va tion of 3.0 ft to 4.8 ft NAVD

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Relative Sea Level Change Scenarios for Miami Beach (NOAA*, 2017)

RSLC (ft NAVD)

30-yr service life of road

SLR of 1.3 ft or 1.8 ft 30 years out from 2020, for NOAA Int-High or High Curves

*NOAA = Na tio na l Oc e a nic a nd Atmo sphe ric Administra tio n

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Ca lc ula tion Me thod 1: L imite d F looding a t E dg e of Roa d (E OR) re sults in E OR Minimum E le va tion of 3.0 ft to 4.8 ft NAVD

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Ca lc ula tion Me thod 2: L imite d Groundwa te r We tting a t Roa d Ba se during Hig h T ide (MHHW) Re sults in Bottom of Roa d Ba se (BORB) Minimum E le va tion of 2.9 ft NAVD

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NOAA Published MHHW of 0.2 ft NAVD for 1983-2001 epoch was updated to 0.6 ft NAVD based on recent tidal data.

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Hig he r of two c a lc ula tion me thods is se le c te d for E OR or BORB

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E me rg e nc y Roa ds ̶ Minimum E le va tion a t E dg e of Roa d (Me thod 1): 4.8 ft NAVD

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F

• r E

me rg e nc y Ro a ds, Me thod 1 re sults in hig he r Minimum E le va tio n a t E dg e

• f Ro a d fo r

pro je c ts b uilt in 2020.

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All Roa ds ̶ Minimum E le va tion of Bottom of Roa d Ba se (Me thod 2): 2.9 ft, so E dg e of Roa d is 3.9 ft a ssuming 1- ft roa d thic kne ss

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Me thod 2 is use d

to se t Minimum E le va tio n o f Bo tto m o f Ro a d Ba se : 2.9 ft NAVD fo r pro je c ts b uilt in 2020.

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Ma jor Roa ds ̶ Minimum E le va tion of E dg e of Roa d (Me thod 1): 3.6 ft NAVD, so Bottom of Roa d Ba se (Me thod 2): 3.9 ft NAVD is pre fe rre d

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F

• r Ma jo r Ro a ds, Me thod 2 re sults in hig he r Minimum E

le va tio n a t E dg e

• f Ro a d, a ssuming pro je c ts with 1-ft ro a d thic kne ss a nd b uilt in 2020.

Me thod 1:

L imite d F lo o ding a t E OR

Me thod 2:

L imite d Gro undwa te r/ T ida l We tting a t BORB

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Project Start Date 2020 2025 2030 2035 2040 Emergency Roads (Method 1) 4.8 5.2 5.7 6.2 6.7 Arterial and Local Roads (Method 2) * 3.9 4.2 4.5 4.9 5.3

* Method 2 assumes 1 ft road thickness above bottom of

road base.

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Relative Sea Level Change Scenarios for Miami Beach (NOAA, 2017) RSLC (ft (NAVD)

SLR of 2.7 ft or 1.9 ft 30 years out from 2030

30-yr from 2030 30-yr from 2040 30-yr from 2020

SLR of 3.7 ft or 2.7 ft 30 years out from 2040 SLR of 1.8 ft or 1.3 ft 30 years out from 2020

Roa d ra ising stra te g y for future proje c ts inc re a se s in re c og nition of a c c e le ra ting Se a L e ve l Rise proje c tions

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Ha rmoniza tion with Adja c e nt Prope rty

• I

f c o nstra ints a re ide ntifie d b y the City E ng ine e r, a s a re sult o f the minimum ro a d e le va tio n, the n ha rmo niza tio n e xc e ptio n c rite ria supe rse de , a t the disc re tio n o f the City E ng ine e r.

• E

xa mple e xc e ptio n c rite ria ma y inc lude :

• I

na de q ua te ho rizo nta l spa c e to c o nstruc t ro a d impro ve me nts a nd tie b a c k to e xisting g ra de

• Drive wa y g ra de s a nd g ra de b re a k c a nno t me e t City

sta nda rds a t ne w e le va tio n, po sing a c c e ss c o nc e rns

• Adve rse sto rmwa te r ma na g e me nt c o nditio ns c re a te d

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Ha rmoniza tion with Adja c e nt Comme rc ia l Prope rty

• E

xisting issue (sa tura te d b a se c a using ro a d syste m fa ilure s)

• Pro po se d ro a d

e le va tio n c re a te s c o nflic ts with b uilding s

• Ha rmo niza tio n so lutio n

inc lude s use o f e dg e tre a tme nt to mitig a te

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Ha rmoniza tion with Adja c e nt Re side ntia l Prope rty

• Pro po se d ro a d

e le va tio n ma y c re a te drive wa y a c c e ss issue s.

• Shift side wa lks to

de c re a se a ng le o f slo pe .

• Ra ising side wa lk a nd

ro a dwa y le ss to de c re a se a ng le o f slo pe .

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Propose d Crite ria for Ha rmoniza tion

• Drive wa y slo pe s within F

DOT sta nda rds to a vo id a dve rse c o nditio ns.

• Re c o mme nde d ma ximum drive wa y slo pe s
• Re side ntia l:

12.5% (1V:8H)

• Comme rc ia l: 10.0% (1V:10H)
• Re c o mme nde d ma x. side wa lk c ro ss-slo pe = 1.5%

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Adverse Driveway Conditions

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Propose d Crite ria for Ha rmoniza tion

If drive wa y slope c ha ng e s more tha n 14.0% a t a c re st or sa g , a ve rtic a l tra nsition will be provide d.

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• Ro unde d

ve rtic a l tra nsitio ns

• Stra ig ht

ve rtic a l tra nsitio ns

Adverse Driveway Conditions Rounded Vertical Transitions Straight Vertical Transitions

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Propose d Ha rmoniza tion Solutions (E xa mple s)

• Alte rna tive ro a d tre a tme nts (re ta ining wa lls, ste ps, ADA ra mps, e tc .)
• T

e mpo ra ry c o nstruc tio n e a se me nt to re duc e slo pe o f drive wa ys.

• L
• we r side wa lk a t drive wa y to impro ve drive wa y g ra de s.
• Co lle c t sto rmwa te r fro m b e hind side wa lk, into sto rm dra ina g e syste m.
• Do n’ t ra ise ro a dwa y a s hig h a s minimum sta nda rd.

(so lutio ns vary be twe e n re side ntial and c o mme rc ialpro pe rty)

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Ba se me nts De fine d

F E MA De finitio n: Any a re a o f a b uilding ha ving its flo o r sub g ra de (b e lo w g ro und le ve l) o n a ll side s.

(De finitio n a do pte d a nd c o difie d b y City o f Mia mi Be a c h, Ordina nc e Se c tio n 54-35)

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Building Floor

Ba se me nt Condition

Building Floor

Not a Ba se me nt

Ground level Ground level

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Purpose of Pumps, for Stormwa te r Ma na g e me nt

• Ma inta in sto rmwa te r

disc ha rg e during hig h tide , a llo wing stre e ts a nd pro pe rtie s to dra in.

• E

le va ting ro a ds mitig a te s a g a inst hig h tide s a nd g ro undwa te r.

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Building Floor High Tide & Future Sea Levels

T a sk 3

Ne ig hb o rho o d Pro je c t Prio ritiza tio n

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Ne ig hborhood Proje c t Group Prioritiza tion Obje c tive s

• Stra te g ic a lly g uide prio ritiza tio n
• f City Ne ig hb o rho o d Pro je c ts
• Ma ximize b e ne fits, minimize

impa c ts

• Ob je c tive , tra nspa re nt, a nd

re pe a ta b le me tho do lo g y

NEIGHBORHOOD PROJECT: A project involving multiple City Services; for example:

• Road improvements
• Water/sewer maintenance
• Stormwater upgrades

City Planning Processes Individual Capital Projects Group into Prioritized Neighborhood Projects Prioritization Methodology

Ove ra ll Proc e ss for Ne ig hborhood Proje c t Prioritiza tion

Today’s Focus

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Guiding Princ iple s

• Pub lic sa fe ty is to p prio rity
• Wa te r a nd wa ste wa te r se rvic e de live ry a nd e nviro nme nta l pro te c tio n

suppo rt multiple o b je c tive s

• Pub lic he a lth, lo c a l e c o no my, re g ula to ry c o mplia nc e
• E

c o no mic de ve lo pme nt is suppo rte d b y City se rvic e s

• Se rvic e de live ry/ c a pa c ity, risk ma na g e me nt
• Ro utine ma inte na nc e suppo rts lo ng -te rm se rvic e supply re lia b ility
• Ae sthe tic s no t a sta nd-a lo ne o b je c tive (b ut impo rta nt)

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Ne ig hborhood Proje c t Prioritiza tion

• De ve lopme nt of Me thodolog y
• E

sta b lishe d 11 pro je c t c a te g o rie s

• De ve lo pe d c rite ria fo r e a c h c a te g o ry c o rre spo nding to le ve l o f impo rta nc e

(sc o re s c o rre spo nd to le ve l o f impo rta nc e )

• De ve lo pe d we ig ht fa c to rs fo r e a c h c a te g o ry
• Note s About Me thodolog y
• Pro je c ts c a n ha ve a ttrib ute s tha t spa n multiple c a te g o rie s
• Pro je c ts with multiple b e ne fits pro duc e hig he r sc o re s

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Ne ig hborhood Proje c t Prioritiza tion: E le ve n Ca te g orie s of Proje c ts

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Project Categories Obj bjectives a and nd Bene nefits of City Projects Brief Description

Aesthetics Business visibility, landscaping, historical integrity, green streets Coastal Flood Risk Management Exposure and sensitivity to king tides, sea level rise, storm surge, extreme weather Economic Development Type of development Emergency (Critical) Facilities and Roads Emergency response effectiveness Environmental Benefits (Ecological) Type of environmental benefits Pedestrian and Bicycle Mobility Infrastructure that enables more and safer pedestrian and bicycle movement Potable Water/Fire Suppression System Public safety, public health, and infrastructure condition Rain Driven Storm Water Management Flood management, environmental protection, and regulatory compliance Road Classification Type and capacity of road Sanitary Sewer Service Delivery Provision of service, capacity and condition of system Transportation – Road Condition/Remaining Service Life Condition and service life of road

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Ne ig hborhood Proje c t Prioritiza tion

Ra ting Proje c ts Ac ross Multiple Ca te g orie s of Obje c tive s a nd Be ne fits

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Ne ig hborhood Proje c t Prioritiza tion

Ra ting Proje c ts Ac ross Multiple Ca te g orie s of Obje c tive s a nd Be ne fits

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Rank Project Category Project Category Weight Factor (%)

1

Coastal Flood Risk Management 100

2

Potable Water Distribution / Fire Suppression System 100

3

Emergency (Critical) Facilities & Roads 90

4

Sanitary Sewer Service Delivery 85

5

Rain Driven Storm Water Management 85

6

Environmental Benefits 70

7

Economic Development 60

8

Pedestrian and Bicycle Mobility 50

9

Road Classification 40

10

Road Condition Maintenance 40

11

Aesthetics 35

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• Sc oring a nd Prioritizing Proje c ts
• 1. I

de ntify a ll pro je c ts in the Ne ig hb o rho o d Pro je c t Gro up

• 2. De ve lo p sc o re fo r e a c h pro je c t:
• 1. Ca n invo lve multiple c a te g o rie s
• 2. Se le c t sing le a ttrib ute tha t b e st re pre se nts the pro je c t
• 3. Apply c a te g o ry we ig ht fa c to r to e a c h a ttrib ute va lue
• 4. Add up sc o re s fo r pro je c t to g e t to ta l pro je c t sc o re
• 3. Add to ta l pro je c t sc o re s fo r a ll pro je c ts in

Ne ig hb o rho o d Gro up fo r o ve ra ll sc o re fo r tha t g ro up

• 4. Use o ve ra ll Ne ig hb o rho o d Pro je c t Gro up sc o re to

c o mpa re a nd prio ritize multiple Ne ig hb o rho o d Pro je c t Gro ups

E xa mple Applic a tion

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Ne ig hborhood Proje c t Group 1 (Hypothe tic a l)

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Ne ig hborhood Proje c t Group 2 (Hypothe tic a l)

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Ne ig hborhood Proje c t Group 3 (Hypothe tic a l)

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E xa mple : Ra nking a nd Prioritizing Multiple Proje c ts Groups

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Highest Priority Project

T ha nk You

F

• r Ge tting I

nvo lve d

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