?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.relation=http%3A%2F%2Fmiis.maths.ox.ac.uk%2Fmiis%2F391%2F&rft.title=Designing+a+Green+Roof+for+Ireland&rft.creator=Hewitt%2C+I.&rft.creator=Lacey%2C+A.A.&rft.creator=Mellgren%2C+N.&rft.creator=Vynnycky%2C+M.&rft.creator=Robinson%2C+M.&rft.creator=Cooker%2C+M.&rft.subject=Environment&rft.subject=Fluids&rft.description=A+model+is+presented+for+the+gravity-driven+flow+of+rainwater+descending+through+the+soil+layer+of+a+green+roof%2C+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%2C+relative+to+the+total+soil+thickness%2C+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%2C+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%2C+the+roots+and+the+rainwater+in+the+inter-granule+pores.&rft.date=2009&rft.type=Study+Group+Report&rft.type=NonPeerReviewed&rft.format=application%2Fpdf&rft.language=en&rft.identifier=http%3A%2F%2Fmiis.maths.ox.ac.uk%2Fmiis%2F391%2F1%2FESGI70_3.pdf&rft.identifier=++Hewitt%2C+I.+and+Lacey%2C+A.A.+and+Mellgren%2C+N.+and+Vynnycky%2C+M.+and+Robinson%2C+M.+and+Cooker%2C+M.++(2009)+Designing+a+Green+Roof+for+Ireland.++%5BStudy+Group+Report%5D+++++