His educated guess that green roofs can reduce stormwater runoff and therefore reduce peak demand on wastewater treatment plants in cities with combined sewer systems wasn't enough for Drew A. Gangnes, director of civil engineering for Magnusson Klemencic Associates, Seattle. He knew he would need to arm himself with hard numbers if he wanted to try to convince politicians that giving developers incentives to build green roofs might pay off by minimizing the need for capital investment in expanding plant capacity.
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机译：他的有根据的猜测是，屋顶绿化可以减少雨水径流，从而减少污水处理厂在污水处理厂中的高峰需求，这对西雅图Magnusson Klemencic Associates土木工程总监Drew A. Gangnes来说还不够。他知道，如果他想说服政客，让开发商鼓励建造绿色屋顶的动机可能会通过最大限度地减少扩大工厂产能的资本投资而获得回报，那么他就需要用坚强的数字武装自己。
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