Download Green Roof Systems: A Guide to the Planning, Design and by Susan K. Weiler, Katrin Scholz-Barth PDF

By Susan K. Weiler, Katrin Scholz-Barth

Eco-friendly Roof platforms is going past the modern eco-friendly roof stream and offers sturdy info on construction obtainable area, frequently as vital public area, over constitution. It bargains short assurance of the full procedure, together with making plans and collaboration, and specializes in the technical features of those roof structures, their parts, and their purposes.

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Extra info for Green Roof Systems: A Guide to the Planning, Design and Construction of Building Over Structure

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74-inch rain event. 3 The lag time indicates the retention capacity of the roof and quantifies the storage capacity for stormwater quantity control. Water retention was calculated by subtracting the measured runoff from the total recorded rainfall amount. In this study the living green roofs were seeded, not planted, and exhibited sparse (only 5 percent) vegetation cover throughout the monitoring period. There was no water consumption by plants through either uptake or evapotranspiration and thus no added runoff reduction benefits from plants or foliage.

This, however, raises several important issues relating to stormwater: the cumulative effect of creating ever more impervious surfaces and removal FIGURE 2-5 In addition to carrying surface pollutants from vehicles, stormwater runoff carries vast amounts of sediment to our sewers and eventually our waterways. qxp 3/12/09 9:03 AM Page 28 of stormwater quickly from sites, the resulting water quality and its effect on our streams and rivers, and the role of green roof systems in mitigating the effects of increased impervious surfaces.

There was no water consumption by plants through either uptake or evapotranspiration and thus no added runoff reduction benefits from plants or foliage. The runoff reduction benefits were achieved solely by the soil profile. if moderately sloped, is more effective at detaining and holding stormwater than a moderately sloped or even flat asphalt parking lot surface. Soils Once unintercepted precipitation hits the ground, the rate at which it either infiltrates into the soil or becomes stormwater runoff is again dependent upon the type of soil and the slope of the ground plane.

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