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A larger storage volume (up to 140 m<sup>3</sup>/ha) is recommended for constructed wetlands designed to enhance suspended solid removal and treat runoff from catchments with a high impervious cover. Conversely, constructed wetlands designed for basic treatment and low impervious cover can be have lower storage volumes (minimum of 60 m<sup>3</sup>/ha). The table below shows recommended storage volumes for constructed wetlands, depending on level of protection and impervious cover. For comparison, the recommended storage volume for wet ponds is 60 - 250 m<sup>3</sup>/ha.
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