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LID opportunities in industrial, commercial and multi-residential types (view source)
Revision as of 18:10, 26 September 2017
, 7 years agono edit summary
Permeable pavement is a retrofit option for both types of parking facilities. Internal roadways can also be retrofitted with permeable pavement.
Permeable pavement is a retrofit option for both types of parking facilities. Internal roadways can also be retrofitted with permeable pavement.
==Large commercial sites==
Large commercial sites include big box stores, warehouses, and shopping malls. These sites are often located in highly urbanized commercial centres. They are commonly owned and operated by land management companies.
Large commercial sites are rarely more than two storeys in height. These sites typically have large parking lots that may be underused. Roof areas are often fl at and drain internally through the building to onsite storm sewers. Though these sites are expansive, they rarely have complex networks of pedestrian walkways and often rely on vehicular traffic to get site users onsite.
===Parking areas===
Not all parking areas are used equally. At large commercial sites parking spots may be reserved for people with disabilities, visitors to the site, expectant mothers, families with young children, specific employees, deliveries, motorcycles, electric cars, taxis and/or public transportation. When considering parking areas for LID retrofit locations, identify and respect these special areas during the design process. The retrofit team should also be aware of how site parking is used throughout the week.
Parking spaces close to building entrances are used more frequently than those in moderate and peak demand areas. If grading and other site-specific factors allow it, the designer may choose to install permeable pavement in the infrequently used areas to extend the life of the system. Conversely, the social benefits of green features may be underappreciated in areas that are not frequented by site users. Developing practices like bioswales or bioretention areas closer to the
entrance of the building may be more practical. On many sites existing drainage patterns will dictate where parking lot source controls can be located.
===Roof areas===
The roof areas of large commercial buildings account for large impervious surfaces. Controlled roof drains have become a widely utilized tool for stormwater management with the commercial development industry. While these devices do attenuate flows, they do not significantly reduce runoff volumes. By simply directing roof runoff to a soakaway pit, you can provide a great amount of volumetric stormwater control. Consider going one step further and storing this water in a cistern for future use. Commercial rooftops are relatively clean and complex filtration is not required prior to most
non-potable uses.