Green Roofs a Scandinavian perspective Bent C. Braskerud
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1 Green Roofs a Scandinavian perspective Bent C. Braskerud Green Roofs - Part of Scotland s sustainable future 2011 Mars 31 og Framtidens byers workshop om Grønne tak 29. november 2011
2 Green roof examples in Norway, Sweden and Denmark Historic view Modern green roofs Peat grass contra sedum Green roof and stormwater Green roofs as a BMP in a stormwater strategy BMPs and the local community
3 The way the Vikings made houses Peat and grass on timber and birch bark Photo: Dylan Kereluk Illustration of Arkikon
4 From old Norwegian farms to cottages in the mountains
5 Modern use of peat for green roofing Nittedal torvindustri sells peat for m 2 roofs/yr
6 Modern green roofs Sweden Keeps more than 50 % of the annual precipitation Germany 8 mill. m2/yr 0.1 m 2 /German Sedum-species often used
7 Peat roofs contra sedum roofs 7
8 Peat roofs contra sedum roofs Artificial precipitation: 52 mm in one hour Runoff from roof (mm) Runoff from roof Peat Peat Black roof Wmax = maximum watercontnet compared to dry matter Sedum: 302 % Peat: 978 % [email protected] Hours from start 8
9 Grønne tak Peat roofs contra sedum roofs Artificial precipitation: 52 mm in one hour, then drainage Runoff from roof (mm/2 min.) Black roof Peat Peat Wmax = maximum watercontnet compared to dry matter Sedum: 302 % Peat: 978 % [email protected] Hours from start 9
10 Modern use of peat for green roofing Peat has a very large water holding capacity Suitable for roof gardening It oxidizes to CO 2 and H 2 O Peat recourses is only slowly renewable Grass needs irrigation if the summer is dry Is the total positive effect of peat > than the negative?
11 Modern green roofs Sweden Keeps more than 50 % of the annual precipitation Germany What about cold climate? Sedum-species often used
12 Tools for a rough climate 30 Mars 2011 Green roof
13 Established summer 2009 Green roof experiment Hvor mye vann holder et norsk grønt tak tilbake? 8 m 2 8 m 2
14 Green roof system 2-3 cm Vegtech system
15 Sampling system
16 July 2009 was 2 x wet as usual mm Precipitation Nedbør og avrenning and runoff (mm) Precipitation Reference Green roof Nedbør Avr. vanlig tak Avr. grønt tak 179 mm 25 % 134 mm
17 Extreme precipitation on a dry sedum roof July 3rd 2009 Precipitation and runoff (mm) mm in 30 min 187 l/s/ha 138 l/s/ha - First rain absorbed (9 mm) - Runoff peak delayed a little - Runoff intensity lowered (26 %) - Runoff distributed over a longer time (Difference over 2 hours 6 mm; 22%). Precipitatiton Runoff reference Runoff green roof :00 18:05 18:10 18:15 18:20 18:25 18:30 18:35 18:40 18: l/s/ha 18:50 18:55 19:00 19:05 19:10 19:15 19:20 19:25 19:30 19:35 19:40 19:45 19:50 19:55 20:00 5 minute intervals
18 30th July 09 Precipitation and runoff (mm) Nedbør og avrenning (mm) 2,50 2,00 1,50 1,00 Runoff from a wet green roof 14 mm in 2 hours 68 l/s/ha 35 l/s/ha - First rain absorbed (2,5 mm ) - Runoff peak delayed a little - Runoff intensity lowered (51 and 36 %) - Runoff distributed over a longer time (Difference over 3 hours 1,3 mm; 11%) Precipitation Nedbør Avr. Reference vanlig tak Avr. Green grønt roof tak 0,50 19 l/s/ha 0,00 18:30 18:40 18:50 19:00 19:10 19:20 19:30 19:40 19:50 20:00 20:10 20:20 20:30 5 minute intervals 20:40 20:50 21:00 21:10 21:20 21:30 21:40 21:50
19 k r a m n e D, n e g a h n e p o C s f o o R n New houses with roof angle e e r Green Roofs in Copenhagen G less then 30 degrees will have a green roof Dorthe Røhmø City of Copenhagen
20 Green Roofs drivers: Climate adaptation and greener city Dorthe Røhmø City of Copenhagen
21 All new flat roofs must be green in new local plans Digit 8 by BIG Dorthe Røhmø City of Copenhagen
22 Sweden - Malmö
23 Augustenborgs Botanical Roof Garden Plenty of sedum, but also other types of green roofs
24 Runoff experiments on 3 cm sedum Results -Annual precipitation 705 mm, retention (47 %) -When field capacity is reached, then runoff ~ precipitation -9 mm storage capacity [email protected] Lund University, Sweden
25 Water storage increases with the precipitation intensity storage 0.3 mm storage Precipitation 0.2 mm/min 6 5 Runoff [email protected] Lund University, Sweden hour 0
26 Priority one: Green roofs need to look beautiful! 17. July 2011 Drought? Roof 1 Roof 3
27 Frost damage? New start
28 Vanning etter behov
29 Sustainable Urban Drainage Systems SUDS Drainage pipes Paved surfaces Gray solutions Piped solutions Green solutions Local infiltration Detention basins Green roofs Green roofs Root zone retention Artificial ponds Wetlands Reopen streams Surface runoff Rain gardens
30 Testing av regnbeds kapasitet Hvis regnbed er 7 % av takareal og 50 års nedbør i Oslo. Testet 30 min og 10 min regn Regnbed på leire i Oslo
31 Foreløpige resultater Max inn: 184 l/min (307 l/s ha) Max ut: 29 l/min (48 l/s ha) Dempet vf-topp med: 84 % Master UMB 2012 Kjetil Kihlgren og Vegar Saksæther
32 Stormwater BMPs in Malmö Södra systemet Houses from the 50s -Defekt stormwater system -Social problems Ekostaden Augustenborg Kanaler och dammar Kanaler og dammer ISS Landscaping
33 Results: - No stormwater related water damage - Biodiversity increased 50 % - Turnover sales decreased from 50 % to 20 % - Number of voters from 54 % in 1998 to 79 % in 2002
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