Featured Research

from universities, journals, and other organizations

Greenroofs Can Save Cities Millions Of Gallons Of Water

Date:
August 4, 2009
Source:
Ecological Society of America
Summary:
Having a garden on your roof isn't just nice for a garden party; it can make your city more environmentally friendly. Many American cities are beginning to incorporate greenroofs into their planning ordinances because they recognize that, planting a rooftop garden can offset heat, increase city biodiversity and decrease stormwater runoff. This runoff can be problematic in cities where rainwater is funneled by streets and parking lots directly into streams, carrying with it chemicals and debris and increasing the risk of flash floods.

Having a garden on your roof isn't just nice for a garden party; it can make your city more environmentally friendly. Many American cities are beginning to incorporate greenroofs into their planning ordinances because they recognize that, planting a rooftop garden can offset heat, increase city biodiversity and decrease stormwater runoff. This runoff can be problematic in cities where rainwater is funneled by streets and parking lots directly into streams, carrying with it chemicals and debris and increasing the risk of flash floods.

Related Articles


But the plants on greenroofs can absorb some of this water – "like a sponge being saturated," says Olyssa Starry, a graduate student at the University of Maryland at Baltimore County. Starry studied a greenroof atop a Baltimore building in comparison to a similar building without a greenroof to determine how well the roof would absorb water from frequent storms. By measuring water flowing out of building downspouts, she found that the greenroof retained from 30 to 75 percent of water from storms, compared to a negligible amount retained by the building with no greenroof.

Although her results are preliminary, Starry thinks that cities can reap benefits from making greenroofs a part of their building requirements, as cities like Toronto and Berlin have recently done. Using GIS satellite imagery, she estimated the number and area of buildings that could hold greenroofs within one watershed in the Baltimore area. If all these roofs were greened, she says, the city could save the watershed 8 million gallons of water per year, or about 10 percent of its yearly water loss.

"We need to understand what implementing these greenroofs at the whole watershed scale can do," she says. "Getting people to learn about this technology and providing incentives is the first step."

This research was presented at the Ecological Society of America's Annual Meeting on August 3, 2009.


Story Source:

The above story is based on materials provided by Ecological Society of America. Note: Materials may be edited for content and length.


Cite This Page:

Ecological Society of America. "Greenroofs Can Save Cities Millions Of Gallons Of Water." ScienceDaily. ScienceDaily, 4 August 2009. <www.sciencedaily.com/releases/2009/08/090803083628.htm>.
Ecological Society of America. (2009, August 4). Greenroofs Can Save Cities Millions Of Gallons Of Water. ScienceDaily. Retrieved January 30, 2015 from www.sciencedaily.com/releases/2009/08/090803083628.htm
Ecological Society of America. "Greenroofs Can Save Cities Millions Of Gallons Of Water." ScienceDaily. www.sciencedaily.com/releases/2009/08/090803083628.htm (accessed January 30, 2015).

Share This


More From ScienceDaily



More Earth & Climate News

Friday, January 30, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: Rare Clouds Fill Grand Canyon

Raw: Rare Clouds Fill Grand Canyon

AP (Jan. 29, 2015) For the second time in two months, a rare weather phenomenon filled the Grand Canyon with thick clouds just below the rim on Wednesday. (Jan. 29) Video provided by AP
Powered by NewsLook.com
Senate Passes Bill for Keystone XL Pipeline

Senate Passes Bill for Keystone XL Pipeline

AP (Jan. 29, 2015) The Republican-controlled Senate has passed a bipartisan bill approving construction of the Keystone XL oil pipeline. (Jan. 29) Video provided by AP
Powered by NewsLook.com
"Cloud Inversion" In Grand Canyon

"Cloud Inversion" In Grand Canyon

Reuters - US Online Video (Jan. 29, 2015) Time lapse video captures a blanket of clouds amassing in the Grand Canyon -- the result of a rare meteorological process called "cloud inversion." Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Why Researchers Say We Should Cut Back On Biofuels

Why Researchers Say We Should Cut Back On Biofuels

Newsy (Jan. 29, 2015) Biofuels aren&apos;t the best alternative to fossil fuels, according to a new report. In fact, they&apos;re quite a bad one. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins