Constrained spaces

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There are so many opportunities to get creative in fitting LIDLow Impact Development. A stormwater management strategy that seeks to mitigate the impacts of increased urban runoff and stormwater pollution by managing it as close to its source as possible. It comprises a set of site design approaches and small scale stormwater management practices that promote the use of natural systems for infiltration and evapotranspiration, and rainwater harvesting. practices into tight spaces, or to integrate them onto/into buildings! Space efficient BMPs include:

In many cases it may be possible to include infiltrating practices within 'normal' setbacks too[2]. This will depend upon the native soilThe natural ground material characteristic of or existing by virtue of geographic origin. type, the depth of the water tableThe upper surface of the zone of saturation, except where the surface is formed by an impermeable body.Subsurface water level which is defined by the level below which all the spaces in the soil are filled with water; The entire region below the water table is called the saturated zone., and the underdrainA perforated pipe used to assist the draining of soils. configuration being designed to prevent mounding of the groundwaterThe water below the surface, and typically below the groundwater table.. See also groundwater mounding.

Building integrated vegetation

Shallowly planted green walls as seen in Asian, European or West Coast climates have some trouble surviving in Ontario. However, planter boxes can be incorporated into the facades and the relatively small catchments of roof decks and balconies can be routed to irrigate them. These can house deciduous trees, shrubs or climbing plants to provide shading to the building envelope as well as capturing stormwaterSurface runoff from at-grade surfaces, resulting from rain or snowmelt events..


  1. AECOM, Water. People. Places. A guide for master planning sustainable drainage into developments (2013) https://www.westsussex.gov.uk/media/2270/suds_design_guidance.pdf
  2. Wilson, S. (2012). “Using SuDS close to buildings.” <https://www.susdrain.org/files/resources/fact_sheets/09_12_fact_sheet_suds_close_to_buildings.pdf> (Mar. 8, 2018).