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<h4>Water quantity</h4>
 
<h4>Water quantity</h4>
Green roof performance has not been reported to reduce over time. Controlled studies have instead indicated that maturing green roofs may have improved water retention properties [http://www.sciencedirect.com/science/article/pii/S0022169417300768].
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Green roof performance has not been reported to reduce over time. Controlled studies have instead indicated that maturing green roofs may have improved water retention properties <ref>http://www.sciencedirect.com/science/article/pii/S0022169417300768</ref>.
    
<h5>Water balance</h5>
 
<h5>Water balance</h5>
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