Journal article

Identifying critical inundation thresholds to maintain vegetation cover in stormwater treatment wetlands

JJ Robertson, TD Fletcher, A Danger, C Szota

ECOLOGICAL ENGINEERING | ELSEVIER SCIENCE BV | Published : 2018

Abstract

Vegetation cover, specifically emergent macrophyte cover, is critical to the performance of constructed stormwater treatment wetlands which are widely used to protect receiving waterways. Maintenance of vegetation relies on a suitable water level regime, which in turn is governed by the hydraulic loading rate and efficiency of the outlet control structure. Wetland designers need to take these factors into account to avoid excessive depth and duration of inundation. We investigated the relationship between the water level regime and vegetation cover in 19 stormwater wetlands. We found a strong relationship between the median water level and vegetation cover, where vegetation cover was general..

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