Defining green roof detention performance

Stovin, Virginia; Vesuviano, Gianni; De-Ville, Simon

doi:10.1080/1573062x.2015.1049279

Cited by 96 publications

(80 citation statements)

References 17 publications

(35 reference statements)

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“…There is a large inter-event variability shown in most reported studies with reported retention from 0 to 100%, showing a decrease in retention with increasing event sum precipitation [9,21,26,27], but also, other factors such as antecedent soil moisture content are found to be important.…”

Section: Retention Performancementioning

confidence: 99%

“…Detention performance in the field is closely linked to the retention performance, as the initial losses by retention will be included in the detention metrics. Stovin, et al [9] studied four different U.K. climates with a green roof detention model and showed that locations that experienced higher levels of retention also demonstrated improved detention. Feitosa and Wilkinson [42] modelled green roofs in the HYDRUS-1D software modelling water flow in porous media and showed that runoff peak attenuation was severely reduced at high antecedent soil moisture conditions.…”

Section: Retention Performancementioning

confidence: 99%

“…For a given precipitation event, detention can be expressed with several different metrics like peak attenuation and lag times between precipitation and runoff describing time delays (start, stop, peak, centroid, etc.) [9]. Detention performance in the field is closely linked to the retention performance, as the initial losses by retention will be included in the detention metrics.…”

Section: Retention Performancementioning

confidence: 99%

“…Preferable tools should incorporate the total variability of the performance, while still being able to relate this to relevant performance standards or design precipitation. Stovin, et al [9] applied probability density functions (PDF) as a probabilistic approach to compare performance against design standards, like the regulatory greenfield runoff rate, still based on event metrics. Another possible probabilistic approach to evaluate performance without using event metrics is the use of flow duration curves (FDC).…”

Section: Type Of Studymentioning

confidence: 99%

“…Detention is the ability to temporarily hold back (detain) the water, resulting in a reduced and delayed peak runoff with a prolonged runoff period compared to a conventional roof. In field studies, the observed effect will often be a combination of retention and detention [9].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Detention and Retention Behavior of Four Extensive Green Roofs in Three Nordic Climate Zones

Johannessen

Muthanna

Braskerud

2018

Water

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Climate change coupled with increasing urbanization has made extensive green roofs, both for retrofitting and new developments, an attractive way to bring nature back to cities, while managing stormwater. This study has investigated extensive green roof retention and detention performance based on 3-8 years of field data from four Norwegian locations representing typical cold and wet Nordic climates, also comparing several different commercial configurations. Accumulated retention was found to be 11-30% annually and 22-46% in May through October. The performance was found to be strongly dependent in evapotranspiration and less dependent on material storage capacities. Estimates for available storage capacities for precipitation events larger than 5 mm are given and can be useful for design purposes. Median observed peak attenuation compared to the precipitation ranged from 65 to 90% depending on locations and configurations. The event-based approach for evaluating detention was found to be challenging due to the nature of the precipitation in the studied locations. An alternative approach using flow duration curves based on the observed time series was tested and found to give valuable information on runoff patterns from green roofs and to be useful for evaluating green roof performance in relation to local requirements.

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Section: Retention Performancementioning

confidence: 99%

Section: Retention Performancementioning

confidence: 99%

Section: Retention Performancementioning

confidence: 99%

Section: Type Of Studymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Detention and Retention Behavior of Four Extensive Green Roofs in Three Nordic Climate Zones

Johannessen

Muthanna

Braskerud

2018

Water

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On the use of multi-objective optimization for multi-site calibration of extensive green roofs

Abdalla

Alfredsen

Muthanna

2022

Preprint

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Conceptual hydrological models are practical tools for estimating the performance of green roofs. Such models require calibration to obtain parameter values, which limits their use when measured data are not available. One approach that has been thought to be useful is to transfer parameters from a gauged roof calibrated locally (single-site calibration) to a similar ungauged roof in a different location. This study tested this approach by transferring calibrated parameters of a conceptual hydrological model between sixteen extensive green roofs located in four Norwegian cities. The approach was compared with a multi-site calibration scheme that explores trade-offs of model performances between the sites. The results showed that single site calibration could yield optimal parameters for one site and perform poorly in other sites. In contrast, obtaining a common parameter set that yields satisfactory results (Kling Gupta Efficiency >0.5) for different sites, and roof properties could be achieved by multi-site calibration.

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Hydrologic processes that govern stormwater infrastructure behaviour

Eger

Chandler

Driscoll

2017

Hydrological Processes

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Using water budget data from published literature, we demonstrate how hydrologic processes govern the function of various stormwater infrastructure technologies. Hydrologic observations are displayed on a Water Budget Triangle, a ternary plot tool developed to visualize simplified water budgets, enabling side‐by‐side comparison of green and grey approaches to stormwater management. The tool indicates ranges of hydrologic function for green roofs, constructed wetlands, cisterns, bioretention, and other stormwater control management structures. Water budgets are plotted for several example systems to provide insight on structural and environmental design factors, and seasonal variation in hydrologic processes of stormwater management systems. Previously published water budgets and models are used to suggest appropriate operational standards for several green and grey stormwater control structures and compare between conventional and low‐impact development approaches. We compare models, characterize and quantify water budgets and expected ranges for green and grey infrastructure systems, and demonstrate how the Water Budget Triangle tool may help users to develop a data‐driven approach for understanding design and retrofit of green stormwater infrastructure.

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Defining green roof detention performance

Cited by 96 publications

References 17 publications

Detention and Retention Behavior of Four Extensive Green Roofs in Three Nordic Climate Zones

Detention and Retention Behavior of Four Extensive Green Roofs in Three Nordic Climate Zones

On the use of multi-objective optimization for multi-site calibration of extensive green roofs

Hydrologic processes that govern stormwater infrastructure behaviour

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