The role of living roofs in holistic stormwater management systems - Living Roofs in Integrated Urban Water Systems - page 43

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1 Various terminology is found to refer to a collective suite of technologies to mitigate
runoff impacts. In the United States, the term “SCM” is currently promoted by the Water
Environment Federation and American Society of Civil Engineers/Environmental and
Water Resources Institute (2012) in lieu of the historic term “best management practice”
(BMP). In the UK, “sustainable urban drainage systems” (SUDS) prevails, while
“stormwater devices” are employed in New Zealand.
2 The term “retention pond” may provide some confusion in this context. A “retention
pond” refers to a basin with a permanent pool of water, as opposed to a detention basin
which is dry between storm events. In either case, there is usually no signiicant mechanism
designed to reduce runoff volume, as both act as a bowl that ills and drains during a
storm event. In a retention pond, some evaporation may occur between storm events, but
the quantity is generally insigniicant compared to the total amount of storm low.
3 The calculation of an ARI relects the probability of a rainfall depth's occurrence (or it
being exceeded) in any given year. For example, a two-year ARI has a one in two, or 50
percent, chance of occurring in any given year. The spectral frequency analysis (percentile
calculations) relects an ordered ranking of rainfall depths. The calculations provide
different platforms for analysis and interpretation of long-term historical rainfall data.
4 A historical perspective on the evolution of typical stormwater management objectives is
found in Chapter 2 of Fassman-Beck et al. (2013).

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