GEPETO Project. Rémy BOURNIQUE INSA Lyon Jean-Luc BERTRAND-KRAJEWSKI INSA Lyon Jean-Christophe GRIMARD VEGETAL id
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1 GEPETO Project INSA Lyon Jean-Luc BERTRAND-KRAJEWSKI INSA Lyon Jean-Christophe GRIMARD VEGETAL id 1 Green roofs as SUDS Interception of the rainfall : closest to the raindrop. 4-6% of the annual rainfall intercepted. Evapotranspiration. Cool island effect : green roofs fight the urban heat island effect. No ground coverage. But Green roof = Sponge roof : when saturated, no retention. Critical rain events : successive / heavy no retention. Sewer system risks saturation & overflow : untreated water released to the environment. 2 1
2 Innovative green roof Vegetal ID Blue / green roof system. Designed to store more rainwater and release it at a drop-by-drop rate. Classical green roof trays placed upon storage trays with two ways of discharge : downwards to the sewer system via a flow regulator, upwards to the plants via capillarity wicks. 3 Innovative green roof Vegetation layer Substrate layer Filtering layer Drainage layer Storage tray Capillarity wick Connector Flow regulator 4 2
3 GEPETO Project : monitoring setup Experimental site located in Mions, 15 km SE of Lyon. Installation in July 215. First measurements in August GEPETO Project : monitoring setup Comparison of different roof solutions : Bare roof ❶, Standard green roof ❷, Innovative blue / green roof, Standard ❸ Without capillarity wicks ❹. ❷ ❸ ❶ ❹ 6 3
4 GEPETO Project : monitoring setup Measures Weather data Rain, Air temperature, Relative humidity, Wind speed, Net radiation. Runoff data. Inlet Electromagnetic flowmeter Overflow Water level Storage tray, Drainage layer Substrate. 1 ml tipping bucket 1L tipping bucket Temperature Air above the roof systems, Roofing membrane, Surface temperature. 7 Monitoring : rain event analysis.6 April 3th mm in 46h Bare roof Outflow rate (L/min) st phase Green roof interception 2nd phase Green roof saturated Filling of the tray 3rd phase Water levelishigh enoughin the tray for the regulator to function Green roof Blue / green roof Blue / green roof (w/o wicks) Rain intensity Rain intensity (mm/h) /4/216 1/5/216 2/5/216 3/5/
5 Monitoring : rain event analysis Bare roof Green roof Blue/ green roof Blue / green roof w/o wicks Interception 28.% 7.2% 99.6% 95.1% Peak attenuation 56% 83% 96% 98% Good retention performance from the 3 vegetated roofs Green roof shows its limits : once saturated, retention is only 38%. With capillarity wicks : water level in the tray lower at the beginning of the event increased retention capacity. Greater peak attenuation on the innovative roof thanks to the flow regulator. 9 Monitoring : first year results Retention (%) BR GR B/GR B/GR w/o wicks Peak rate attenuation(%) B/GR BR GR B/GR w/o wicks Min Mean Max (nombre de données) (94) (96) (96) (37)* (81) (97) (96) (37)* Innovative blue / green roof offers higher performance than the standard green roof. Higher retention interest of the storage tray. Better attenuation interest of the flow regulator. *Due to experimental contingencies, reliable data are not available for the blue / green roof without wicks until march 216. Therefore we cannot conclude on the effect of the wicks on the long term. 1 5
6 Monitoring : consecutive rainfall events retention Standard green roof Innovative green roof Rainfall interception (%) 1% 75% 5% 25% % ADWP (days) Rainfall interception (%) 1% 75% 5% 25% % ADWP (days) RR < 13 mm 13 mm < RR < 45 mm 45 mm < RR RR < 13 mm 13 mm < RR < 45 mm 45 mm < RR Higher retention for the innovative green roof, especially during successive rain events (ADWP < 5 days). 11 Modelling INPUT P ETP 24 parameters = =(1 ) H I H I max VEGETATION SUBSTRATE H S FC WP H S max H A H A max ALVEOLI H B H B l H B r H B max STORAGE 12 OUTPUT 6
7 Modelling Standard green roof Runoff rate (L/min) Sim Obs P (mm/h) Rain intensity(mm/h) /4/216 1/5/216 2/5/216 3/5/ Modelling Innovative green roof w/o wicks.6 Runoff rate (L/min) Obs Sim P (mm/h) Rain intensity(mm/h) /4/216 1/5/216 2/5/216 3/5/
8 Conclusion & perspectives Innovative green roof offers higher performances than standard green roof. Better interception of heavy or consecutive rain events. Model improvement : slope non-homogeneous water repartition, more water to the outlet. New experimental site in Marseille : installation scheduled Q Follow-up of irrigation needs in a dry climate. Weather data + vegetation condition + water consumption 15 8
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