The Thermal and Rainwater Runoff Performance of an Extensive ...
The Thermal and Rainwater Runoff Performance of an Extensive ...
The Thermal and Rainwater Runoff Performance of an Extensive ...
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with the artificial rain event. When the rain event stops the run<strong>of</strong>f from the PV p<strong>an</strong>el stopssoon afterwards (around 23 minutes), whereas run<strong>of</strong>f continues from the green ro<strong>of</strong>.<strong>The</strong> second artificial rain event was set for <strong>an</strong> intensity <strong>of</strong> 2 mm/min <strong><strong>an</strong>d</strong> the duration <strong>of</strong> thiswas 20 minutes. <strong>The</strong>refore the total rainfall was 40 mm.Green Ro<strong>of</strong> <strong><strong>an</strong>d</strong> PV P<strong>an</strong>el <strong>Run<strong>of</strong>f</strong> <strong>Perform<strong>an</strong>ce</strong>Rain/<strong>Run<strong>of</strong>f</strong> (mm)454035302520151050Rainfall (mm)Green Ro<strong>of</strong><strong>Run<strong>of</strong>f</strong>PV P<strong>an</strong>el<strong>Run<strong>of</strong>f</strong>024681012141618202224262830Time (mins)Figure 44: Green Ro<strong>of</strong> <strong><strong>an</strong>d</strong> PV P<strong>an</strong>el <strong>Run<strong>of</strong>f</strong> <strong>Perform<strong>an</strong>ce</strong> for 2 mm/min Rain EventAs c<strong>an</strong> be seen from figure 44, run<strong>of</strong>f occurs from the green ro<strong>of</strong> after 6 minutes – requiring10 mm <strong>of</strong> rainfall for run<strong>of</strong>f to occur. <strong>Run<strong>of</strong>f</strong> from the PV p<strong>an</strong>el occurs almost immediatelywith the artificial rain event. When the rain event stops the run<strong>of</strong>f from the PV p<strong>an</strong>el stopssoon afterwards (around 25 minutes), whereas run<strong>of</strong>f continues from the green ro<strong>of</strong>.For both rainfall events, the initial moisture content <strong>of</strong> the substrate was 15 – 20%.Niall Carroll Page 67<strong>The</strong> <strong>The</strong>rmal <strong><strong>an</strong>d</strong> <strong>Rainwater</strong> <strong>Run<strong>of</strong>f</strong> <strong>Perform<strong>an</strong>ce</strong> <strong>of</strong> <strong>an</strong> <strong>Extensive</strong> Green Ro<strong>of</strong> System
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