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Message: <blockquote data-quote="Nellisir" data-source="post: 6279004" data-attributes="member: 70">You mean water storage tanks on tops of buildings? Those are usually to provide pressurized gravity-fed water to a building, which is nice when the power goes out and particularly in case of a fire.  They're typically refilled by pumps from city water.  There's not enough regular and sustained rainfall to use it as a reliable water source for drinking water, I think.  You can catch rainwater and direct it into a grey-water system to supplement city water for flushing toilets & etc; I think that's what most people talk about now. Whether or not it actually gets done is another question.A blue-roof system is another option; you could just capture the rainwater and allow it to evaporate, or do a controlled release so the system isn't overwhelmed.The storm drains and sewer systems in NYC are interconnected, so storm water goes to the sewer treatment plant. In a rain event, the treatment plants can't handle the additional volume, and it gets shunted straight out into the river.  It's an old design; not desirable for obvious reasons."A significant blue roof pilot project intended to evaluate the potential of the systems for mitigating combined sewer overflow impacts was conducted between 2010 and 2012 by the <a href="http://en.wikipedia.org/wiki/New_York_City_Department_of_Environmental_Protection" target="_blank">New York City Department of Environmental Protection</a>. The NYCDEP blue-roof projects are the first to utilize a novel passive blue roof tray design developed by Geosyntec Consultants which relies on the lateral transitivity of non-woven filter fabric for drawdown control in a full scale pilot. Monitoring of these systems has demonstrated their performance as an effective means for mitigation peak flows and alteration of timing in combined sewer systems." (Blue roofs, Wikipedia)</blockquote>

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