Chapter
Apr 26, 2012
Quantifying Evapotranspiration Rates for New Zealand Green Roofs
Authors: Elizabeth Fassman, Ph.D. [email protected], Emily Voyde [email protected], Robyn Simcock, Ph.D. [email protected], and Julia Wells [email protected]Author Affiliations
Publication: Low Impact Development for Urban Ecosystem and Habitat Protection
Abstract
Green roofs are an emerging stormwater management tool that have predominantly been analysed with regard to runoff volume reduction and peak flow mitigation. Little research has been completed regarding evapotranspiration (ET). Sedum mexicanum (Mexican Stonecrop) and the NZ native species Disphyma australe (NZ Ice Plant) in a NZ designed, pumice and zeolite based substrate have been analysed to determine daily and hourly ET rates under unstressed and drought conditions. Water loss, and thus storage recharge of the substrate, is greatest in the first 10 days. Transpiration by Sedum mexicanum contributes 47% of the total ET and Disphyma australe (NZ Ice Plant) contributes 44%. After the initial rate of rapid water loss, plants conserve water and ET is not significantly different to evaporation from the unplanted tray. Sedum mexicanum has a greater ability to conserve water and thus has a greater longevity of life than the NZ Ice Plant under harsh drought conditions.
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Low Impact Development for Urban Ecosystem and Habitat Protection
Pages: 1 - 13
Copyright
© 2009 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
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Department of Civil and Environmental Engineering, University of Auckland, Private Bag 92019, Auckland Mail Centre, Auckland 1142, NZ.E-mail: [email protected]
Landcare Research, Private Bag 92170, Auckland Mail Centre, Auckland 1142, NZ.E-mail: [email protected]
Department of Civil and Environmental Engineering, University of Auckland, Private Bag 92019, Auckland Mail Centre, Auckland 1142, NZ.E-mail: [email protected]
Department of Civil and Environmental Engineering, University of Auckland, Private Bag 92019, Auckland Mail Centre, Auckland 1142, NZ.E-mail: [email protected]
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