Harvesting the Rain

In 2002, when a severe decline in winter snow and spring rainfall forced the city to declare a drought emergency, gardeners throughout New York City faced a new twist on an age-old dilemma.

Unable to tap city fire hydrants -- the traditional irrigation source for community gardens -- garden managers looked to the skies for respite. Taking a cue from early farmers, they gathered as many jars, barrels and cisterns as they could find and set them out to capture and store a portion of every summer downpour that passed over the city. By the end of the year, at least seven gardens had created elaborate rainwater harvesting systems channeling water from neighboring rooftops and downspouts to 55-gallon drums and underground cisterns.

Four years later, the pressure to capture each precious drop of water may not be as high, but the rainwater harvesting continues. A loose-knit coalition of environmental groups calling itself Water Resources Group has helped community gardeners install water retention systems in 25 local gardens. The group has even secured a $45,000 grant from the Environmental Protection Agency to finance systems in at least four community gardens, starting with the Bedford Avenue Block Association Garden in Brooklyn near the corner of Bedford and De Kalb avenues.

Some of the larger sites use 1,000 gallon tanks, says project coordinator Lenny Librizzi of the Council on the Environment of New York City, a group member. But others use 55-gallon olive barrels donated by a Queens olive distributor.

As assistant director of the Council on the Environment’s open space greening project, Librizzi sees rainwater collection as an easy way to fulfill that project’s agenda to expand and enhance comunity gardens. For now, most community gardens rely on free city water from fire hydrants. This makes the gardens beholden to the whims of a city government that, for at least the last 10 years, has taken note of the value of the land underlying most community gardens and considered putting the acreage to more financially profitable use. For security's sake, many of the green spaces would prefer to have their own back-up water supply, free of city control.

But there are additional environmental benefits. Last year’s grant from the Environmental Protection Agency, for example, came about because the group was able to show that recycling rainwater reduces demand on the city’s storm sewers and so can help cut water pollution. Although the city is overhauling its aging combined sewer overflow system, many neighborhoods still send storm water runoff and household waste into the same sewers. Catching rainwater reduces the demand on the sewers, giving city pumps in these neighborhoods more time to work before the sewers reach the overflow stage and send untreated sewage into local waterways.

“It’s a win-win for the environment and for gardeners,” says Robin Simmen, manager of the Brooklyn Botanic Garden’s GreenBridge horticulture program. “First of all, rainwater is better for plants than chlorinated tap water so you’ll get bigger, healthier plants. Also, by harvesting rainwater, we reduce the amount of storm water that we are currently flooding into our sewer system.”

Or as Librizzi puts it, “In collecting rainwater, we’re not only making the city greener, we’re making it bluer.”

Granted, it takes more than a few dozen community gardens to put a dent in the city’s storm water runoff problem. The Water Resources Group estimates that its 25-garden network currently captures a little more than 250,000 gallons of rainwater annually. Compare that to the average family’s use of an estimated 100,000 gallons a year and it’s hard to resist the punning drop-in-a-bucket metaphor.

But rainwater harvesting can also produce a change in the way New Yorkers think about water. Once New Yorkers stop seeing water as something they can take for granted, they start appreciating what it truly is: a fickle resource that takes time to capture.