− | | + | The use of rain barrels (190L) across a watershed of 100 residential units has been modelled for a number of U.S. cities[http://onlinelibrary.wiley.com/doi/10.1111/jawr.12038/abstract]. In Philadelphia (reflecting the most similar climate to Southern Ontario) the use of rain barrels for irrigation only, provided an annual stormwater reduction of approximately 2%. |