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Article

Hydrological Performance of LECA-Based Roofs in Cold Climates

1
Department of Civil and Environmental Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway
2
Leca International, Årnesvegen 1, 2009 Nordby, Norway
*
Author to whom correspondence should be addressed.
Water 2018, 10(3), 263; https://doi.org/10.3390/w10030263
Received: 15 December 2017 / Revised: 27 February 2018 / Accepted: 28 February 2018 / Published: 3 March 2018
(This article belongs to the Special Issue Sponge Cities: Emerging Approaches, Challenges and Opportunities)
Rooftops represent a considerable part of the impervious fractions of urban environments. Detaining and retaining runoff from vegetated rooftops can be a significant contribution to reducing the effects of urbanization, with respect to increased runoff peaks and volumes from precipitation events. However, in climates with limited evapotranspiration, a non-vegetated system is a convenient option for stormwater management. A LECA (lightweight expanded clay aggregate)-based roof system was established in the coastal area of Trondheim, Norway in 2016. The roof structure consists of a 200 mm-thick layer of LECA® lightweight aggregate, covered by a concrete pavement. The retention in the LECA-based roof was estimated at 9%, which would be equivalent to 0.27 mm/day for the entire period. The LECA-based configuration provided a detention performance for a peak runoff reduction of 95% (median) and for a peak delay of 1 h and 15 min (median), respectively. The relatively high moisture levels in the LECA-based roof did not affect the detention performance. Rooftop retrofitting as a form of source control may contribute to a change in runoff characteristics from conventional roofs. This study of the LECA-based roof configuration presents data and performance indicators for stormwater urban planners with regard to water detention capability. View Full-Text
Keywords: detention; cold climate; hydrological performance; LECA-based roof; lightweight aggregate; sustainable drainage systems (SuDS); water-detaining non-green roof detention; cold climate; hydrological performance; LECA-based roof; lightweight aggregate; sustainable drainage systems (SuDS); water-detaining non-green roof
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MDPI and ACS Style

Hamouz, V.; Lohne, J.; Wood, J.R.; Muthanna, T.M. Hydrological Performance of LECA-Based Roofs in Cold Climates. Water 2018, 10, 263. https://doi.org/10.3390/w10030263

AMA Style

Hamouz V, Lohne J, Wood JR, Muthanna TM. Hydrological Performance of LECA-Based Roofs in Cold Climates. Water. 2018; 10(3):263. https://doi.org/10.3390/w10030263

Chicago/Turabian Style

Hamouz, Vladimír; Lohne, Jardar; Wood, Jaran R.; Muthanna, Tone M. 2018. "Hydrological Performance of LECA-Based Roofs in Cold Climates" Water 10, no. 3: 263. https://doi.org/10.3390/w10030263

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