Green Roofs - Living Architecture Monitor - Spring 2018 - 7

calculation into the context of the whole site (i.e. not just the building footprint), or possibly a whole catchment or sewershed.
Flow processes through an engineered green roof (and
many other green infrastructure systems) are very complicated.
Unfortunately, current design guidance offered by many regulatory agencies either neglects calculation instruction altogether,
or offers very simplified approaches which are akin to a bucket
filling up and emptying or overflowing. This approach neglects
the dynamic operation of a green roof, and tends to underestimate
performance.
The US Environmental Protection Agency's Stormwater Management Model (SWMM), is the only model of which I am aware
that specifically incorporates calculation routines that might accurately represent green infrastructure technologies. I say "might"
because its accuracy hasn't been widely tested (yet) against
observed data. SWMM can be applied at any scale - from a single
building to an entire watershed. SWMM also offers the benefit
of being an open-source, publicly available model. We're working
on generating field performance data that can evaluate SWMM's
accuracy for a variety of green infrastructure technologies.
MH: Green roofs in Florida typically require irrigation during
the dry season. Additionally, to provide a water quality benefit,
it may be necessary to capture and reuse green roof runoff.
For this reason, when designing green roofs in Florida, it is
recommended to provide some water storage to capture this

runoff. To effectively size the cistern a long term, 10 years or
greater of precipitation data, continuous simulation model is
recommended. There are many software programs available to
perform this modeling such as EPA SWMM, ICPR, or even
using Microsoft Excel.
8. Are you aware of any developments coming down the pipe that will
either strengthen or weaken the use of green infrastructure, and if so what
are they?
EFB: At the moment, major investments in green infrastructure
are occurring across the USA in order to comply with regulations,
and avoid potential massive environmental fines, by reducing the
frequency and volume of combined sewer overflows (CSOs). In
cities like New York and Philadelphia, investments are anticipated
at over US$1B. This isn't a problem unique to large cities though.
The US EPA indicates that most communities with CSO problems
have fewer than 10,000 people. Widespread stormwater GI implementation has been shown to be a critical contributor to technically
achieving the required level of runoff mitigation.
MH: I would say resiliency and sea-level rise might be an ally to
the green roof industry. This is because green roofs can reduce
runoff at a given site without additional footprint. In a future where
stormwater attenuation and storage will be harder to find, green
roofs might offer a solution in space limited urban areas.

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Table of Contents for the Digital Edition of Green Roofs - Living Architecture Monitor - Spring 2018

Table of Contents
Green Roofs - Living Architecture Monitor - Spring 2018 - I
Green Roofs - Living Architecture Monitor - Spring 2018 - Cover1
Green Roofs - Living Architecture Monitor - Spring 2018 - Cover2
Green Roofs - Living Architecture Monitor - Spring 2018 - Table of Contents
Green Roofs - Living Architecture Monitor - Spring 2018 - A1
Green Roofs - Living Architecture Monitor - Spring 2018 - 1
Green Roofs - Living Architecture Monitor - Spring 2018 - 2
Green Roofs - Living Architecture Monitor - Spring 2018 - 3
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Green Roofs - Living Architecture Monitor - Spring 2018 - 34
Green Roofs - Living Architecture Monitor - Spring 2018 - Cover3
Green Roofs - Living Architecture Monitor - Spring 2018 - Cover4
Green Roofs - Living Architecture Monitor - Spring 2018 - M1
Green Roofs - Living Architecture Monitor - Spring 2018 - AD1
Green Roofs - Living Architecture Monitor - Spring 2018 - AD2
Green Roofs - Living Architecture Monitor - Spring 2018 - AD3
Green Roofs - Living Architecture Monitor - Spring 2018 - AD4
https://www.nxtbook.com/dawson/greenroofs/lam_2020Summer
https://www.nxtbook.com/dawson/greenroofs/lam_2020Spring
https://www.nxtbook.com/dawson/greenroofs/lam_2019Winter
https://www.nxtbook.com/dawson/greenroofs/lam_2019Fall
https://www.nxtbook.com/dawson/greenroofs/lam_2019Summer
https://www.nxtbook.com/dawson/greenroofs/lam_2019Spring
https://www.nxtbook.com/dawson/greenroofs/lam_2018winter
https://www.nxtbook.com/dawson/greenroofs/lam_2018Fall
https://www.nxtbook.com/dawson/greenroofs/lam_2018summer
https://www.nxtbook.com/dawson/greenroofs/lam_2018spring
https://www.nxtbook.com/dawson/greenroofs/lam_2017winter
https://www.nxtbook.com/dawson/greenroofs/lam_2017fall
https://www.nxtbook.com/dawson/greenroofs/lam_2017summer
https://www.nxtbook.com/dawson/greenroofs/lam_2017Spring
https://www.nxtbook.com/dawson/greenroofs/lam_2016winter
https://www.nxtbook.com/dawson/greenroofs/lam_2016fall
https://www.nxtbook.com/dawson/greenroofs/lam_2016summer
https://www.nxtbook.com/dawson/greenroofs/lam_2016spring
https://www.nxtbook.com/dawson/greenroofs/lam_2015Winter
https://www.nxtbook.com/dawson/greenroofs/lam_2015fall
https://www.nxtbook.com/dawson/greenroofs/lam_2015summer
https://www.nxtbook.com/dawson/greenroofs/lam_2015spring
https://www.nxtbook.com/dawson/greenroofs/lam_2014winter
https://www.nxtbook.com/dawson/greenroofs/lam_2014fall
https://www.nxtbook.com/dawson/greenroofs/lam_2014summer
https://www.nxtbook.com/dawson/greenroofs/lam_2014spring
https://www.nxtbook.com/dawson/greenroofs/lam_2013winter
https://www.nxtbook.com/dawson/greenroofs/lam_2013fall
https://www.nxtbook.com/dawson/greenroofs/lam_2013summer
https://www.nxtbook.com/dawson/greenroofs/lam_2013spring
https://www.nxtbook.com/dawson/greenroofs/lam_2012fall
https://www.nxtbook.com/dawson/greenroofs/lam_2012summer
https://www.nxtbook.com/dawson/greenroofs/lam_2012spring
https://www.nxtbook.com/dawson/greenroofs/lam_2012winter
https://www.nxtbook.com/dawson/greenroofs/lam_2011fall
https://www.nxtbook.com/dawson/greenroofs/lam_2011summer
https://www.nxtbook.com/dawson/greenroofs/lam_2011spring
https://www.nxtbook.com/dawson/greenroofs/lam_2011winter
https://www.nxtbook.com/dawson/greenroofs/lam_2010fall
https://www.nxtbook.com/dawson/greenroofs/lam_2010summer
https://www.nxtbook.com/dawson/greenroofs/lam_2010spring
https://www.nxtbook.com/dawson/greenroofs/lam_2010winter
https://www.nxtbook.com/dawson/greenroofs/lam_2009fall
https://www.nxtbook.com/dawson/greenroofs/lam_2009summer
https://www.nxtbook.com/dawson/greenroofs/lam_2009spring
https://www.nxtbook.com/dawson/greenroofs/lam_2009winter
https://www.nxtbook.com/dawson/greenroofs/lam_2008fall
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