Embed Size (px)
Citation preview
5/11/2016
1
New York City’s
Green Solutions to Urban Drainage
and Resilient Neighbourhoods
Alan Cohn, Climate Program Director
NYC Department of Environmental Protection
Adaptation Futures
11 May 2016
2
NYC’s Pervious Land Coverage
5/11/2016
2
3 Hunter Island, Pelham Bay Park
Jamaica Bay
Development vs. Open Space
4
NYC’s First Green Drainage Solution
• DEP began the Bluebelt program in the 1990s to build natural
drainage corridors, including streams, ponds, and wetland areas, that
convey, store, and filter stormwater
• 400 acres of Bluebelts drain 14,500 acres (5.868 hectares), or
approximately 39% of Staten Island’s total land mass
5/11/2016
3
5
Today’s Sewer System in NYC
6
Combined Sewage Overflows
= does not meet water
quality standards
(pathogens/DO)
75% meets pathogen
standards for swimming
18% meets standards for
boating and fishing
7% tributaries that do not
meet secondary
contact standards
5/11/2016
4
7
Managing Runoff from Impervious Areas
8
Managing Runoff from Impervious Areas
5/11/2016
5
9
Managing Runoff from Streets
10
Area-wide
Contracts in
Construction
Area-wide
Contracts in
Design
Bioswales in
Construction
Preliminary
Bioswales
Green Infrastructure Strategy
5/11/2016
6
11 PS 261, Brooklyn – Before
Managing Runoff from Public Property
12 Before
PS 261K, Brooklyn. Opened Sept. 2013 Photos courtesy of TPL PS 261, Brooklyn – After
Managing Runoff from Public Property
5/11/2016
7
13
Managing Quality vs. Quantity
14
Storm Surge from Hurricane Sandy - 2012
Rockaway Beach
5/11/2016
8
15
Cloudburst in Long Island, NY - 2014
Credit: National Weather Service
• 13.27 inches (34 cm) of rain
in less than 24 hours
• Peak intensity of nearly
6 inches/hour (15 cm/hour)
16
Cloudburst in Texas - 2015
• Flash flooding and persistent rainfall with rates of more than 4 inches (10 cm)/hour in
southeast Texas, around Houston
• 37 counties under a state of emergency
• More than 150 locations reported river flooding in the central and southern Plains
across Texas, Oklahoma, Louisiana, Arkansas, eastern Kansas and western
Missouri.
•
Photo courtesy of USA Today; Satellite view: Weather Channel
5/11/2016
9
17
Managing Surge + Cloudbursts
18
Partnering on Cloudbursts
5/11/2016
10
19
Cloudburst Management in NYC
Source: Ramboll
20
Cloudburst Management in NYC
Source: Ramboll
5/11/2016
11
21
Cloudburst Management in NYC
Source: Ramboll
22
Cloudburst Management in NYC
5/11/2016
12
23
Alan Cohn
+ 1 718-595-4536
NYC.gov/DEP/
ClimateChange
Cloudburst Management in NYC
