living with the bay resiliency strategy - ny … · (key objective 5) living with the bay ... 28...

Living with the Bay

Prepared by:

Task e. Watershed Management Recommendation Report (Key Objective 5)

June 2017

Resiliency Strategy

#200-87963-17001

June 2017

PRESENTED TO PRESENTED BY

Governor’s Office of Storm Recovery

25 Beaver Street

New York, New York 10004

Tetra Tech

5 Hanover Square

New York, NY 10004

P +1-646-576-4034

F +1-212-480-2836

tetratech.com

Task e. Watershed Management Recommendation Report

(Key Objective 5)

Living with the Bay Resiliency Strategy

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TABLE OF CONTENTS

1.0 GENERAL .................................................................................................................................................................... 1

2.0 PROBLEM AREAS ...................................................................................................................................................... 1

3.0 PROJECTS FROM PROBLEM AREAS....................................................................................................................... 3

4.0 RECOMMENDATIONS (GENERAL)............................................................................................................................ 8

4.1 WATER STORAGE – WATER QUALITY AND SLOW STREAMS ........................................................................ 9

4.2 A GREENER EDGE – BIOSWALES AND MARSH RESTORATION .................................................................. 10

4.3 SPACE FOR THE RIVER - ECOHABITATS & TIDAL/SURGE PROTECTION ................................................... 12

4.4 BLUE-GREEN CORRIDOR – HISTORY, EDUCATION, & PUBLIC ACCESS .................................................... 14

5.0 PROJECT DESCRIPTIONS (PD) DEVELOPMENT .................................................................................................. 15

6.0 CONCLUSION ............................................................................................................................................................ 16

LIST OF FIGURES

Figure e-1: Problem Area Map ...................................................................................................................................2 Figure e-2: Example Problem Area Grouping ............................................................................................................3 Figure e-3: Project ID Exhibit ......................................................................................................................................4 Figure e-4: Examples of Water Storage Projects .......................................................................................................9 Figure e-5: Examples of Green Infrastructure Projects ........................................................................................... 10 Figure e-6: Examples of Marsh Restoration Interventions ...................................................................................... 11 Figure e-7: Examples of Fish Ladders and Living Shorelines ................................................................................. 12 Figure e-8: Examples of Tidal and Surge Management Projects ............................................................................ 13 Figure e-9: Examples of Blue-Green Corridor Theme Solutions ............................................................................. 14 Figure e-10: Project ‘A’ Description (See Appendix for all PDs) ............................................................................. 15

LIST OF TABLES

Table e-1: Potential LWTB Projects from the Identified Problem Areas…………………………………………………5 Table e-2: Project Information Summary Matrix *………………………………………………………………………...16

APPENDIX

Project Descriptions (36)

Disclaimer: The information provided in this document is based on the best available data and information

provided by others at the time of the preparation of this material and is subject to change.

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1.0 GENERAL

The contents of the deliverables associated with the prior tasks a, b, c and d fulfill the New York State Governor’s

Office of Storm Recovery’s (GOSR’s) first four (4) Key Objectives – 1) Statement of Purpose, Need, and Goals; 2)

Description and Assessment of the Waterbody (ies) and Watershed Resources; 3) Description and Assessment of

Local Laws, Programs and Practices; and 4) Watershed Characterization Report. The 92 problem areas identified

from Key Objective 4 - Watershed Characterization Report have been further analyzed and condensed into 36

projects basing on the drainage area and location for better evaluation purposes. The methodology and proposed

interventions for the various problem areas identified are included in task e. Watershed Recommendations Report

associated with Key Objective 5.

Based on the findings of the tasks a-d, the various types and causes of the problems currently experienced in the

Living with the Bay (LWTB) program area have been identified and quantified. In addition, this problem identification

has been vetted through multiple sources through numerous meetings and discussions with local municipal

jurisdictions, the LWTB Technical Advisory Committee (TAC), LWTB Citizens Advisory Committee (CAC), and the

public. This objective includes the conceptual designs of proposed interventions to mitigate flooding caused by tidal,

storm surge and rainfall events, erosion, improve water quality, preserve better life quality and improve recreation

and education opportunities.

2.0 PROBLEM AREAS

LWTB program area has higher number of stakeholders and fall under seven municipal jurisdictions which are

Village of Hempstead, Village of Malverne, Village of Lynbrook, Village of Rockville Centre, Village of East

Rockaway, Town of Hempstead and Nassau County. The problem areas are identified through the efforts of tasks

a-d shown in Problem Area Exhibit (Figure e-2). Each problem area was assigned a numeric ID and the

approximate limits of the area are shaded in red.

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Figure e-1: Problem Area Map

Figure 2. Problem Area Map.


Figure 2: Problem Area Map

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3.0 PROJECTS FROM PROBLEM AREAS

Problem areas located within common sub-basin drainage areas and with similar problem types were initially

grouped as part of this task. By grouping the problem areas within common drainage systems and similar problem

types will help evaluate and allocate the HUD funds efficiently. This also helps meet other LWTB goals to address

other issues besides flooding. The 92 problems areas were condensed into 40 projects with the responsible

maintenance entity(ies) assigned. Figure e-2 is an example showing problem areas 15, 16, 17, 18, 19, 20, and 21

located in the drainage system on Franklin Street condensed into a single Project B to mitigate flooding in the listed

problem areas. Project B specifically provides additional storage for the west branch of Horse Brook drain to

accommodate flows coming from Franklin Street, and thereby reducing the flooding on Franklin Street for a 10-year

storm event.

The Project locations are located onsite for some problem areas and offsite for other problem areas. This similar

methodology was applied to the problem areas and condensed into Projects represented by alphabetical letter

starting from A to Z and then from AA to OO for a total of 40 projects. The Projects are generally listed north to

south and the sequence of projects listed has no implication of priority or importance. The Projects are represented

on Project ID Exhibit (Figure e-3) and the list of projects are shown in the Table e-1. The exhibit shows grouped

problem areas as single color code representing project and in overall has all the projects shown in multiple colors.

Each project is assigned to a color code and is represented on both Table and Project ID exhibit.

Figure e-2: Example Problem Area Grouping



Figure 3: Problem Area Map

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Figure e-3: Project ID Exhibit

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Table e-1: Potential LWTB Projects from the Identified Problem Areas

Project ID # Problem Area ID # Individual Project location Problem Type Municipal Location O&M Responsibility

A

27 Northeast Pond Water Quality

Town of Hempstead NYS Parks

28 Spillway over SSP Inadequate Collection/Poor

Conveyance 29 Lake Hempstead Dam

Greenway, Gateways and

Waterfront Acsess & Improvements

Public Access and Environmental

Education Education Center

AA 30 Beverly Lane and Lehigh Ct.

Intersection Inadequate

Collection/Poor Conveyance

Village of Rockville Centre


B

15 Bedell St btw Terrace Ave & N

Franklin St

Inadequate Collection/Poor

Conveyance

Village of Hempstead

Nassau Co. DPW

16 W Columbia St & N Franklin St

Intersection

17 Jackson St & N Franklin St

Intersection

18 Centre St & N Franklin St

Intersection

19 Fulton Ave & N Franklin St

Intersection

20 Newmanns Ct off N Franklin St

21 S Franklin St & Peninsula Blvd

BB 86 Intersection of Roxen Road

and Glenwood Road Inadequate




C

9 Hempstead Housing Authority


Conveyance


Nassau Co. DPW

10 Open Channel btw Yale St &

Jackson St

12 Fulton Ave btw Clinton St &

Benett Ave

13 Clinton St & Front St

Intersection

CC 92 Marina Point Shoreline/Marsh

Erosion Town of Hempstead Town of Hempstead

D

1 Cornell St, off Boylston St


Conveyance



2 Amherst St, off Boylston St

3 Stewart Ave & James LL Burrel

Ave Intersection

4 Stewart Ave & Cornell St

Intersection

5 Remsen Ave, off Westbury

Blvd

6 Harriet Ave, off Harvard St

7 Surrey Lane, off Fulton Ave

DD 23 Creek Upstream of North

Ponds Shoreline/Marsh


E 24 Green Ave, Rose Ave, Grant St Inadequate



Village of Hempstead 25

Green Ave & W Marshall St Intersection

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26 Carolina Ave, off Virginia Ave

EE 22 Covert St off Front St Inadequate




F

74 Field above Kenilworth Street


Conveyance Village of Malverne Village of Malverne

75 Kenilworth Street

76 South end of Nottingham Road

77 Corner of Elmer Ave and

Alnwick

78 Intersection of Charles Street

and Rider Ave

80 Intersection between King

Street and Cornwell Avenue

81 Sydney Avenue (south of

Burton Street)

82 South end of Nassau Avenue

FF 68 Sandy Inundation (4100

Parcels) Storm Surge

TOH, RVC, VOL, VOER

TOH, RVC, VOL, VOER

G 72

Field of Crossroads Farms (not a problem area)

Village of Malverne

Nassau Co. DPW

79 Area by Grace Lutheran School

(not a problem area) Inadequate


Village of Malverne

GG 8 Hendrickson ave btw Devon

Rd & Front St Inadequate




H 71 Malverne High School Loss of Natural

Habitat Village of Malverne Village of Malverne

HH 11 Nichols Ct & Washington St

Intersection Inadequate




I 69 SE corner of Ocean ave &

Lakeview Ave. Public Access and

Environmental Education

Village of Lynbrook Village of Lynbrook

II 14 Cooper Square St btw Helen

Keller Way & Liberty St Inadequate




J 37 Buckingham Pl. Inadequate


Village of Lynbrook Village of Lynbrook

JJ 90 Front Street Inadequate



DOT

K 70 Peninsula Blvd Path Public Access and


Village of Lynbrook Nassau Co.

KK 91 SSP Off Ramp to Peninsula

Blvd Inadequate


Town of Hempstead DOT

L

32 Smith Pond Tidal Impact Village of Rockville

Centre Village of Rockville

Centre

84 Tanglewood Culvert Inadequate


Town of Hempstead Nassau Co. DPW

LL 83 Halls Pond Inadequate


Town of Hempstead Nassau Co. DPW

M

33 Lister Park Tidal Impact Village of Rockville

Centre Village of Rockville

Centre 34

Proposed Shoreline protection/ East & West Mill

river

Shoreline/Marsh Erosion

39 Oceanview Road btw S Park

Ave & Centre Ave, Centre ave btw Lake & Oceanview Road,

and Roxbury Rd

Tidal Impact Village of East

Rockaway Village of East

Rockaway 43 East Rockaway High School

Shoreline/Marsh Erosion

53 River Ave & Waterview Rd Tidal Impact Town of Hempstead Town of Hempstead

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N

38 Forest Ave Drainage

Improvements Inadequate


Village of Lynbrook

Village of Lynbrook

89 NW Corner of Sunrise Hwy &

Vincent Avenue DOT

OO 41 Waldo Ave, off Main St Inadequate


Village of East Rockaway


OO 42 Main st/ Lawson Ave / Waldo

Ave intersection Inadequate



East Rockaway / Na Co

O 46 1. Lawson Ave btw Davis St & Franklin St 2. Lawson Ave btw

Lawrence st & North Blvd

Tidal Impact 1. East Rockaway 2.

TOH Nassau Co. DPW

P

49 Lawrence St, off Lawson Ave

Tidal Impact

Town of Hempstead Town of Hempstead 51

North Blvd, West Blvd, East Blvd, side streets off W&E

Blvd, Hewlett Point Ave 85 Rhame Avenue


Nassau Co. DPW

Q

45 Front St, off Main St Storm Surge


Nassau Co. DPW

47 Williamson St

Tidal Impact

48 6th Ave, 7th Ave, 8th Ave,

James St

50 Compton St, off Marjorie Ln Town of Hempstead

63 Harden East Rockaway DPW

Garage and John St Rec Center

R 52 Bay County Park Tidal Impact Town of Hempstead Nassau Co. DPW

S 44 East Rockaway LIRR Tidal Impact Village of East

Rockaway Village of East

Rockaway

T

54 Lawson Blvd btw Bayside Ave & Evans Ave, Evans Ave btw

Lawson Blvd & Yost Blvd

Tidal Impact

Town of Hempstead

Nassau Co. DPW

55 Evan Ave & Messick Ave

Town of Hempstead

56 Weidner Ave, off Bambrick St

57 Royal Ave btw Murdock Ave &

Hampton Rd

58 Hampton Rd, off Daly Blvd Inadequate Collection/Poor

Conveyance 60 Moore Ave & Fulton Ave

66 Lawson Blvd Drainage

Improvements Town of Hempstead Nassau Co. DPW

U

59 Long Beach Rd, off Lincoln Ave Inadequate

Collection/Poor Conveyance Town of Hempstead

Nassau Co. DPW

62 Critical Facility Resiliency:

Oceanside Fire Station Public Access and


Town of Hempstead

V 67 Coastal Marsh Restoration Shoreline/Marsh


W

40 Ocean Ave, off Pearl St

Storm Surge Village of East

Rockaway

Nassau Co. DPW

61 Downtown Resiliency and

Redevelopment Plan Village of East

Rockaway

X 35 S Park Ave & S Centre Ave

intersection Inadequate




Y 88 Maple Ave and N Long Beach

Road Intersection Inadequate




Z 87 Lakeview Ave and Hempstead

Ave Intersection Inadequate




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4.0 RECOMMENDATIONS (GENERAL)

The projects involve various proposed interventions in order to solve the problems related to flooding, erosion, loss

of habitat, water quality, lack of public access and decrease in education opportunities. The solutions involved

typically adhere to the original LWTB ‘slow streams’ concept of provide additional storage through underground

storage or exfiltration, provide storage and increase water quality through green infrastructure projects, restore

habitat restoration, restore marshes and wetlands, restore stream banks, dam restoration, tidal surge protection,

grey infrastructure, greenways and providing recreational and education opportunities in the LWTB program area.

Green Infrastructure projects are recommended where practical over any hard infrastructure projects to capture

both storage and water quality components.

The Projects are divided into following four themes identified by the CAC and each theme is discussed below with

examples. A matrix was also created to show how the themes correlate through the projects.

Water Storage – Water Quality and Slow Streams

A Greener Edge – Bioswales and Marsh Restoration

Space for River – Ecohabitats and Tidal/ Surge Protection

Blue-Green Corridor – History, Education and Public Access

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Figure e-4: Examples of Water Storage Projects

4.1 WATER STORAGE – WATER QUALITY AND SLOW STREAMS

This theme includes solutions involving storing and treating the runoff from upstream drainage areas to reduce

flooding inundation and pollution. Additional storage is utilized to mitigate flooding occurring due to inadequate

conveyance or if the problem is located in a land-locked basin. By providing additional storage, the peak runoff from

the upstream of the problem area will be reduced and thereby attenuating the runoff on the downstream and thereby

helping to mitigate flooding. Depending on the limitations of open space, right-of-way width, and ground water table

elevation, different methods were evaluated for the Projects to provide storage. Open recharge basins are identified

when open space is available and to provide easier maintenance, underground storage or exfiltration chambers are

used in the case of limited space typically in parking lots, and green infrastructure techniques like bioswales and

raingardens are used in parking lots and roadside curbs to provide storage and improve water quality of the runoff

entering from upstream drainage area. The recharge basin and exfiltration chambers are typically utilized to provide

more storage volume and for a bigger storm event. Figure e-4 below provides examples for various projects that

fall under the Water Storage theme.

USDA NRCS WinTR-55 small watershed hydrology software was used to evaluate the storage volume depending

on Nassau County Type III rainfall distribution data for particular storm event and land use data. The storage volume

calculated was used in sizing the exfiltration chambers, recharge basins and green infrastructure bioswales. The

drainage areas were determined using USGS Stream Stats software.

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Figure e-5: Examples of Green Infrastructure Projects

4.2 A GREENER EDGE – BIOSWALES AND MARSH RESTORATION

This theme includes incorporating green infrastructure (GI) bioswales and marsh restoration in order to address the

problem. A greener edge theme is focused on projects which increase natural vegetation or green cover. Bioswales

are vegetated, mulched, or landscaped channels that provide treatment and water storage as they move stormwater

from one place to another (EPA). Vegetated swales slow, infiltrate, and filter stormwater flows. As linear features,

these swales are well suited to being placed along streets and parking lots. During heavy rainfall, the deep rooted

native plants in these areas collect storm water runoff and filter out the contaminants washed off. The various types

of GI projects used in the program area are green streets with bioretention area, greens streets with suspended

pavement, bioretention bump-outs and bioswales. Green streets with incorporated bioretention area are a linear

network of distributed storm water best management practices (BMPs) located in the streets right-of-way designed

to reduce runoff volume and improve water quality. Green streets with suspended pavements are similar to

bioretention areas but they are integrated under the sidewalk for more water storage and treatment. Bioretention

bump-outs capture and treat excess stormwater from the streets and provide opportunities for the runoff to infiltrate

into and through the soil. Bioswales are designed along streets curbs and parking lots to remove silt and pollution

from surface runoff water and provide storage and they consist of gently sloped drainage swales. Figure e-5 shows

examples of various green infrastructure projects.

Marsh restoration also falls under the CAC’s greener edge theme and involves restoring marshes to reduce the

wave action and improve bay ecology. The loss of marsh habitat occurs due to shoreline erosion and wave action

from surge and boat wakes. A variety of marsh restoration approaches are proposed. Rock sill protection is

proposed along marsh shoreline experiencing direct erosive impacts. An enhanced marsh alternative is applied in

lower areas to raise level of marsh and provide rock dike on the shore face for protection against erosive flows.

Floating marsh protection is identified to provide wave attenuation and fish shelter while facilitating nutrient uptake.

Cutoff rock sills are also proposed in certain areas to prevent migration of flow into low marshland channels to

minimize sediment erosion in the channels. In addition to the different edge restoration approaches, beneficial reuse

of dredged materials is also proposed to restore the natural height of some of the marsh areas. Examples for

different proposed interventions for marsh restoration is shown in Figure e-6.

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Figure e-6: Examples of Marsh Restoration Interventions

Existing Conditions Rock Sill/Cutoff Rock Sill

Enhanced Marsh Floating Marsh

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4.3 SPACE FOR THE RIVER - ECOHABITATS & TIDAL/SURGE PROTECTION

This theme includes projects improving habitat restoration and providing tidal and surge protection. Habitat

restoration is the method practiced to renew or restore degraded or damaged ecosystems and habitats in the

environment. Fish ladders are structures allowing migrating fish passage over or around an obstacle on a river

(NOAA).

The ladders contain series of ascending pools that the fish reach by swimming against a stream of water. Fish travel

through the rushing water, rest in a pool, and then repeat the process until they are out of ladder. This general

principle is followed in any design of fish ladders and therefore improves fish habitat in water bodies.

Living shorelines use plants or other natural elements to stabilize estuarine coasts, bays and tributaries (NOAA).

Living shorelines trap sediments from tidal waters, improve water quality, provide fisheries habitat, increase

biodiversity, and promote recreation. They act as natural barriers against storm and provide wave attenuation and

add resiliency. For the LWTB projects, both fish ladders and living shorelines are proposed in the list of potential

projects. Figure e-7 shows examples of fish ladder and living shorelines applications.

Figure e-7: Examples of Fish Ladders and Living Shorelines

NOAA Fisheries / West Coast Region

SW Florida Water Management District/Hunter Springs Living Shoreline Project

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Tidal and surge management projects involve physical improvements to mitigate the impacts of a high tailwater

condition and typically include check valves, elevating bulkheads and raising roads. Bulkheads protect the shoreline

from hide tides and storm surge from inundating the inland. Vinyl sheeting with a tie-back system is typically used

and lasts a long time. Timber is also used but has a shorter life span and needs to be replaced more frequently.

Check valves are installed on outfall pipes to allow stormwater to exit during non-high tide event while managing to

prevent any back flow of tidal influences into the drainage system during high tide. Duck bill check valve and in-line

check valve are the most commonly used back flow prevention devices. In addition to check valves stormwater

treatment structures and catch basin filter bags are added to remove debris and silt from road runoff, cleaning the

stormwater before it enters into the receiving channel and, at the time, helping keep the check valve clean from

debris and properly operating. Raising roads brings road elevation above the high water levels along with allowing

for additional storm water storage during typical rain events. Examples of the tidal and surge management projects

are shown in Figure e-8.

Figure e-8: Examples of Tidal and Surge Management Projects

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Figure e-9: Examples of Blue-Green Corridor Theme Solutions

4.4 BLUE-GREEN CORRIDOR – HISTORY, EDUCATION, & PUBLIC ACCESS

This theme includes projects incorporating solutions improving accessibility to the waterfront, preservation of

cultural heritage and historical properties, and creating new education opportunities. Along the Blue-green corridor,

the multi-use pathway can also be used as a flood berm if constructed at the proper elevation, while at the same

time providing accessibility to the waterfront, increasing safety and ecological value, and creating new education

and recreation opportunities for communities around the river. The examples of blue-green corridor theme solutions

are shown in Figure e-9.

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Figure e-10: Project ‘A’ Description (See Appendix for all PDs)

5.0 PROJECT DESCRIPTIONS (PD) DEVELOPMENT

The Project descriptions (PDs) for each projects were developed in order to determine how the different CAC

themes could be incorporated into the LWTB program. Each PD includes site location information, project area with

problem areas, project impact area, description of the proposed improvements, proposed improvements, site plan,

examples of similar projects and the LWTB objectives and themes met. Figure e-10 shows one of the PDs. All of

the PDs are provided in Appendix A. Four projects are removed from list because they are outside the program

boundary, funded by NYRCR program and not related to flooding problem.

The PDs were developed using a Microsoft Access database and proposed improvements generated using ArcGIS

software and later imported into the Access database. Project site information and proposed characteristics were

entered into tables and a query created in access to format the template and generate a report. The report was

then exported into Nuance Power PDF and the remaining PD elements added.

The cost estimates for the project were estimated using the unit price of the quantities and adding percentages for

construction management, engineering, permitting and contingency. The project life is the project life span and level

of protection represents the approximate storm event flood mitigation or the runoff volume for water quality.

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6.0 CONCLUSION

The final PDs were analyzed for LWTB objectives and a matrix (Table e-2) was created to compare the CAC’s

themes by project. In some cases, a single project covers more than one theme. The matrix shows that 19 projects

fall under water storage theme, 18 projects fall under greener edge theme, 9 projects fall under space for river

theme and 8 projects fall under blue-green corridor theme.

Table e-2: Project Information Summary Matrix *

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