Abstract
This paper evaluates the performance and winter hydrology of two small scale rain gardens in acold climate costal area, in Trondheim, Norway. The rain gardens received runoff from a small residentialwatershed over a 20 month study period. The objective of the study was to investigate to what extent the coldclimate conditions would influence the hydrology and performance of the rain garden. The hydraulic retention,storm lag time and peak flow reduction was measured and compared between the seasons. No significantdifference was found on either hydraulic retention time, lag time or peak flow reduction between the seasons.The hydraulic retention time for the rain garden was 0.83 week with runoff inflow and 2.22 weeks withprecipitation only. The rain garden performance with respect to hydraulic function was not impacted by theclimatic factors experienced during the cold season.
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