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Abstract: Wetlands provide an array of physical, biological and chemical processes necessary to improve downstream water quality from stormwater - most processes are facilitated by the wetland vegetation. The wetland vegetation decreases water velocity enabling the sedimentation of particles. The vegetation is particularly effective in removing finely graded particles many of which adhere directly onto the plant surfaces. The root system binds and stabilises deposited particles protecting them against re-suspension. Biological processes include direct uptake of nutrients and metals either from the sediment by rooted vegetation or directly from the water column by epiphytes growing on plant surfaces, algae, floating and submerged plants. Microbial processes facilitate the removal and transformations of nutrients - in particular nitrogen. Oxygen leakage from the roots of aquatic plants creates oxidised conditions in anoxic sediments which facilitate nitrification. Chemical processes facilitate adsorption and desorption of phosphorus onto and from particles. Dry winters and wet summers with high intensity rainfall are important climatic factors in subtropical SE Queensland which need to be considered in constructed wetland design. Plant species can be selected to tolerate dry periods. Many constructed stormwater wetlands include a deeper inlet zone or control pond to trap gravel, sand, silt; a shallow macrophyte zone to trap fine silt, colloidal particles, particulate organic matter and nutrients, and attenuate flow; and a lake/flood retarding basin to store water and further attenuate flow. Flow bypass channels may be necessary in wet periods to cope with additional runoff from high intensity rainfall events.

To cite this article: Greenway, Margaret. Role of Constructed Wetlands for Stormwater Management [online]. In: Gaul, Keron (Editor). Proceedings of the 3rd Queensland Environmental Conference: Sustainable Environmental Solutions for Industry and Government; a Focus of Sound, Practical and Economically Viable Solutions for Industry and Government. Brisbane, Qld.: Environmental Engineering Society (Queensland Chapter), 2000: 325-331. Availability: <http://search.informit.com.au/documentSummary;dn=722343803514143;res=IELENG> ISBN: 0646395556. [cited 14 Feb 16].

Personal Author: Greenway, Margaret; Source: In: Gaul, Keron (Editor). Proceedings of the 3rd Queensland Environmental Conference: Sustainable Environmental Solutions for Industry and Government; a Focus of Sound, Practical and Economically Viable Solutions for Industry and Government. Brisbane, Qld.: Environmental Engineering Society (Queensland Chapter), 2000: 325-331. Document Type: Conference Paper, Research ISBN: 0646395556 Subject: Runoff--Management; Wetland conservation--Planning; Storm water retention basins--Design and construction; Constructed wetlands--Design and construction; Wetland conservation; Wetland management; Affiliation: (1) School of Environmental Engineering, Griffith University, Brisbane

Database: Engineering Collection