Runoff Reduction Effects of Green Roofs in Vancouver, BC, Kelowna, BC, and Shanghai, P.R. China

Roehr, Daniel; Yuewei Kong
March 2010
Canadian Water Resources Journal/Revue Canadienne des Ressources;Spring2010, Vol. 35 Issue 1, p53
Academic Journal
This research examines how distinct climatic conditions affect the runoff reduction functions of green roofs by comparing performance in Vancouver, BC, Kelowna, BC and Shanghai, P.R. China. To quantify the reduction in runoff volume effectuated by green roofs, both the Soil Conservation Service Curve Number (SCS-CN), crop coefficient method and the Hargreaves-Samani method are applied in calculating the annual water gains and losses of green roofs during a year of average precipitation, using local climate data such as precipitation, evapotranspiration, and temperature. Using a soil water balance model, the research also analyzes the change in soil water content of a typical green roof with a soil depth of 150 mm, and compares the potential irrigation requirements of plants with low versus high water requirements in each of the three cities. The calculation results show that the typical green roof could reduce annual rooftop runoff by 29% in Vancouver, 55% in Shanghai, and 100% in Kelowna. Furthermore, these results illustrate the important role that soil properties, soil depth, and plant selection play in maintaining growth of plants and minimizing green roof irrigation requirements.


Related Articles

  • LiveRoof Maxx.  // American Nurseryman;Jan2012, Vol. 212 Issue 1, p31 

    The article evaluates the LiveRoof Maxx Green roof system from LiveRoof LLC.

  • Evaluation of Green Roofs for Runoff Retention, Runoff Quality, and Leachability. Van Seters, Tim; Rocha, Lisa; Smith, Derek; MacMillan, Glenn // Water Quality Research Journal of Canada (Canadian Association o;2009, Vol. 44 Issue 1, p33 

    This three-year study evaluates the quantity and quality of runoff from an extensive green roof on a multistory building in Toronto. Laboratory physical, chemical, and leachate analyses of eleven commercially available green roof growing media were also undertaken to help identify the potential...

  • Retrieving the root-zone soil moisture from surface soil moisture or temperature estimates: A... Calvet, J.-C.; Noilhan, J. // Journal of Applied Meteorology;Apr98, Vol. 37 Issue 4, p371 

    Presents a study in which the retrieval of soil moisture content in the root zone was estimated by the surface temperature and soil temperature profiles in the top 5 centimeter soil layer. Methodology used in the study; Results of the study; Conclusions based on the results.

  • Soil moisture budgets. Manuel, Mark // Geodate;Mar1995, Vol. 8 Issue 1, p5 

    Presents information on soil moisture budgets (SMB), a method used to measure the availability of moisture in a location. Factors affecting soil moisture; Key elements of SMB graphs; Application of the SMB method to drought conditions in Australia from 1994 to 1995. INSET: Student activities..

  • Using a Soil Hydrology Model to Obtain Regionally Averaged Soil Moisture Values.  // Journal of Hydrometeorology;Aug2000, Vol. 1 Issue 4, p353 

    The Soil Hydrology Model (SHM) was modified, and daily simulations of soil volumetric water content were made at 38 Oklahoma Mesonet sites for July 1997. These model results were compared with soil moisture observations made at the mesonet sites at depths of 5, 25, 60, and 75 cm. This work is...

  • Portable soil meters. Faber, Ben; Downer, James // American Nurseryman;1/15/94, Vol. 179 Issue 2, p93 

    Evaluates portable soil-moisture-measuring devices. Description of the technology used by the devices; Description of the study method used; Retail prices; Durability.

  • Just wet enough. Martinez, Marc // Wenatchee Business Journal;Feb97, Vol. 11 Issue 2, p18 

    Reports on the distribution of a soil moisture monitoring device for use in irrigation. Naming of Cascade Consulting Associates Inc. as the sole distributor for the device; Troxler Electronic Laboratories as manufacturer of the device; Taking of soil samples and downloading of the data into a...

  • CropMetrics takes sensorless approach in latest tech launch. Harris, Tyler // Southeast Farm Press Exclusive Insight;10/31/2019, pN.PAG 

    For the past 10 years, CropMetrics has enabled irrigators to make more informed decisions based on soil moisture data collected from volumetric soil moisture probes feeding into the CropMetrics platform. In addition to irrigation recommendations for the current soil moisture status, the Virtual...

  • Commissioners allow burn ban to expire.  // Malakoff News (TX);9/21/2012, Vol. 103 Issue 35, p1A 

    The article informs that Henderson County, Texas Commissioners Court has allowed the burn ban for expiry and informs about the Keetch-Byram Drought Index, a measure of moisture in the soil, has increased over the 575 mark.


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics