BRICK TOWNSHIP FLOODING SOLUTIONS Presented to the Residents of - - PowerPoint PPT Presentation

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BRICK TOWNSHIP FLOODING SOLUTIONS Presented to the Residents of - - PowerPoint PPT Presentation

Nov 03, 2023 278 likes •477 views

BRICK TOWNSHIP FLOODING SOLUTIONS Presented to the Residents of Normandy Beach Mayor John G. Ducey and Township Council June 11, 2020 ACT ENGINEERS, INC. TEAM Robert Korkuch, PE, PP, CME Eric Rosina President Vice President Principal,

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SLIDE 1

Mayor John G. Ducey and Township Council

BRICK TOWNSHIP FLOODING SOLUTIONS

Presented to the Residents of Normandy Beach

June 11, 2020

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SLIDE 2

Jeff Richter, PE, PP Director, Engineering Carol Beske Director, Community Outreach Eric Rosina Vice President Principal, Environmental Services Junetta Dix Director, Environmental Services Robert Korkuch, PE, PP, CME President

ACT ENGINEERS, INC. TEAM

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ACT ENGINEERS’ INITIAL SCOPE OF WORK

  • Review previous & on-going studies
  • Identify flood elevations and establish

solutions by elevation

  • Prepare mapping of existing conditions

(topography, storm sewer, roadway, bulkhead, key/vulnerable infrastructure, etc.) for 13 identified neighborhoods

  • 13 neighborhoods – this meeting focuses on

Normandy Beach; additional meetings for

  • ther neighborhoods
  • Recommend conceptual engineering design

solutions specific to each neighborhood

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SLIDE 4

13 STUDY AREAS

1) Shore Acres 2) Seawood Harbor (Including Snake Road) 3) Normandy Beach 4) Beaver Dam Creek Watershed

  • a. Bay Harbor
  • b. Baywood
  • c. Harbor Place
  • d. Island Drive / Island Court
  • e. Vannote / Glenwood Place

f.

Swan Point

  • g. Sandy Point
  • h. Tunes Brook

i.

Princeton Ave (Bayfront)

5) Cherry Quay (Seagoin Road)

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SLIDE 5

STEVENS INSTITUTE OF TECHNOLOGY FLOOD ADVISORY (NAVD88) NATIONAL WEATHER SERVICE (GAUGE DATUM)

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SLIDE 6

MHHW = 1.33’

1 2

  • 1
  • 2

MHW = 1.09’ MTL = -0.02’ MSL = -0.02’ MLW = -1.06’ MLLW = -1.18’

Datums for 8533615, BARNEGAT INLET (INSIDE) NJ

Relative to NAVD88

MHHW = Mean Higher High Water MHW = Mean High Water MTL = Mean Tide Level MSL = Mean Sea Level MLW = Mean Low Water MLLW = Mean Lower Low Water MN = Mean Range of Tide

MN = 2.15’

Short-Term Concept Design Elevation Range = 1.4’ to 2.0’

Normandy Beach Lowest Roadway Elevation = 0.85’

TIDAL RANGE NORMANDY BEACH

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SLIDE 7

0.5 1 1.5 2 2.5 3 3.5 4

Elevation (NAVD88)

USGS Barnegat Bay at Mantoloking Tide Gage (NAVD88)

12/21/12 Peak: 3.38’ 11/1/19 Peak: 2.93’ 12/27/12 Peak: 2.90’ 10/12/19 Peak: 2.74’ 10/31/12 Peak: 2.67’ 4/17/11 Peak: 2.66’ 9/2/06 Peak: 2.64’ 3/14/10 Peak: 2.61’ 4/16/18 Peak: 2.60’ 2/7/20 Peak: 2.60’

Average Tide Elevation (rising +1.75” per decade)

*Tide gage data is unpublished

during extreme storm events

  • Irene (8/27 - 28/11)
  • Sandy (10/29 - 30/12)
  • Nor’Easter (3/6/ 7/18)

Concept Design Elevation 1.4’-2.0’

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SLIDE 8

Impacted < 2.0’ Flood Elevation (Short Term Design Approaches)

SITE NAME # DWELLINGS W/ COMPROMISED ACCESS

1

Shore Acres 167

2

Normandy Beach 153

3

Seawood Harbor (Including Snake Road) 136

4

Island Drive/Island Court 46

5

Baywood 38

6

Sandy Point 29

7

Princeton Ave (Bayfront) 16

8

Tunes Brook 12

9

Swan Point 8

10

Bay Harbor 8

11

Cherry Quay (Seagoin Rd) 2

12

Vannote / Glenwood Pl. 2

13

Harbor Place

Impacted > 2.0’ – 3.4’ Flood Elevation (Long Term Design Approaches)

SITE NAME # DWELLINGS W/ COMPROMISED ACCESS

1

Shore Acres 345

2

Normandy Beach 198

3

Seawood Harbor (Including Snake Road) 136

4

Princeton Ave (Bayfront) 134

5

Baywood 67

6

Sandy Point 55

7

Island Drive/Island Court 46

8

Swan Point 37

9

Tunes Brook 30

10

Cherry Quay (Seagoin Rd) 23

11

Bay Harbor 11

12

Harbor Place 10

13

Vannote / Glenwood Pl. 7

COMMUNITY FLOODING IMPACT ASSESSMENT

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SLIDE 9
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SLIDE 11
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Conceptual Flood Mitigation Design Approaches

Site Name Short Term Design Approaches (To Design Elevation < 2.0’) (Floods 1,500± hrs. per year*) Long Term Design Approaches (>2.0’ Design Elevation) (Floods 60± hrs. per year*) Normandy Beach

  • Install Check Valves
  • Raise Roads / Sidewalks / Driveways / etc.
  • Raise Select Bulkheads
  • Install Additional Drainage Infrastructure
  • Raise Roads / Properties
  • Raise Bulkheads
  • Install Additional Drainage Infrastructure
  • Pump Stations

NORMANDY BEACH

Raise Roadways Raise Bulkhead Heights Install Check Valves

*USGS Mantoloking Tide Gage

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SLIDE 13

RAISE ROADWAYS TO MITIGATE TIDAL FLOODING

  • Improves vehicular access during normal tide events
  • May require driveway / sidewalks / yard improvements
  • Stormwater impacts/mitigation addressed with final design
  • Need for neighborhood ‘buy in’

Proposed Raised Road Elevation Existing Road Elevation

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RAISE ROADWAYS TO MITIGATE TIDAL FLOODING

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INSTALL CHECK VALVES

Check Valve Bulkhead Inlets at Gutter Ground Level

W/O CHECK VALVE

Bulkhead Inlets at Gutter Ground Level

WITH CHECK VALVE

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SLIDE 16

RAISE / STABLIZE SHORELINES

Examples: Bulkheads; Living Shorelines; Rock Revetments; etc.

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NORMANDY BEACH ONGOING AND NEXT STEPS

  • Update topographic mapping
  • Identify and pursue funding sources: USACE; FEMA; NJOEM; NJDOT
  • Secure funding
  • Identify and recommend Township Ordinance revisions for future design

standards

  • Coordinate with Toms River
  • Develop a strategy, allocate funding and implement (design/permit/construct)
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QUESTIONS / DISCUSSION

Presentation will be available at www.bricktownship.net/floodplaininformation Any additional questions may be submitted to:

publicmeetingquestions@bricktownship.net brickflooding@actengineers.com