The MIIS Eprints Archive

Designing a Green Roof for Ireland

Hewitt, I. and Lacey, A.A. and Mellgren, N. and Vynnycky, M. and Robinson, M. and Cooker, M. (2009) Designing a Green Roof for Ireland. [Study Group Report]



A model is presented for the gravity-driven flow of rainwater descending through the soil layer of a green roof, treated as a porous medium on a at permeable surface representing an efficient drainage layer. A fully saturated zone is shown to occur. It is typically a thin layer, relative to the total soil thickness, and lies at the bottom of the soil layer. This provides a bottom boundary condition for the partially saturated upper zone. It is shown that after the onset of rainfall, well-defined fronts of water can descend through the soil layer. Also the rainwater flow is relatively quick compared with the moisture uptake by the roots of the plants in the roof. In a separate model the exchanges of water are described between the (smaller-scale) porous granules of soil, the roots and the rainwater in the inter-granule pores.

Item Type:Study Group Report
Problem Sectors:Environment
Study Groups:European Study Group with Industry > ESGI 70 (Limerick, Ireland, Jun 28-Jul 3, 2009)
ID Code:391
Deposited By: Dr Kamel Bentahar
Deposited On:28 Nov 2011 15:27
Last Modified:29 May 2015 20:00

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