Glossary - Living Roofs in Integrated Urban Water Systems - page 166

the day with open stomates, rendering plants more susceptible to transpira-
tional water loss because of solar radiation.
Continuous simulation : a stormwater management design approach based on
the continuous distribution of rainfall and ET over long periods of time.
Curve Number ( CN ) : a factor used in the Technical Release (TR)-55 method
(colloquially known as the CN method) to determine runoff low
characteristics. The CN is a quantitative representation of the relationship
between land use, soil type and conditions as they relate to water movement,
and the resultant potential for runoff to be generated from a given magnitude
of rainfall. The CN method is used in water resource planning and in
stormwater management manuals by numerous jurisdictions throughout
North America and Oceania.
Design consultant : designers, including but not limited to, architects, landscape
architect, engineers, ecologists, horticulturalists and building envelope con-
sultants, who are responsible for the conceptual design and construction doc-
umentation of a living roof project. Design consultants are required to
coordinate their work to ensure a workable design package is delivered, and
should be involved throughout the entire design, construction and occupancy
process. In many jurisdictions, design consultants on multi-family, public and
institutional projects are required to be licensed through strictly self-governed
institutions that regulate the work of the design professionals and protect the
interests of the public.
Design storm : a unique single event rainfall distribution used as the basis of
designing urban drainage networks and SCMs. A design storm approach con-
siders in isolation only the runoff created by the design storm, without consid-
eration for other climate or in-situ conditions such as the occurrence of
previous rainstorms or ET.
Detention (of stormwater) : the practice of rainfall or runoff capture and slow
release into the receiving environment. The low rate of runoff is mitigated,
but the total volume of the discharge is not altered. Constructed wetlands
and detention and retention (a misnomer) ponds are typical detention
stormwater control measures. Some evaporation may occur between storm
events in detention stormwater control measures, but the quantity is generally
insigniicant compared to the total amount of storm low.
Drainage area : an area of land contributing to surface stormwater runoff; not
necessarily following a watershed boundary.
Drawings, construction : part of the contractual work completed by building
design consultants, which give contractors the information required to build a
project. The drawings must include all logistical information (e.g., speciica-
tion, size and location of elements,) as well as all required code and by-law
speciic information required for permitting approval. The content of each
consultant's construction drawing set is dependent on the scope of work.
Drawings, shop/trades : drawings completed by the trades and sub-trades con-
tractors (based on construction drawings provided by the design consultants)