Document Detail

Hydraulic response and nitrogen retention in bioretention mesocosms with regulated outlets: part I--hydraulic response.
MedLine Citation:
PMID:  21905406     Owner:  NLM     Status:  In-Process    
In bioretention systems used for stormwater treatment, runoff interception improves with increased infiltration rates. However, nitrogen retention improves with increased retention time or decreasing infiltration rates. These contrasting responses were analyzed in 240-L experimental mesocosms using a variety of media treatments. The mesocosms were vegetated, except for one barren control. Dual-stage outlets were installed to extend retention time and equalize hydraulic responses. One unregulated treatment was free-draining. This part 1 paper presents the media properties and hydraulic responses. The highly aggregated media had saturated hydraulic conductivities ranging from 20.7 to 59.6 cm/h in August 2008 (austral winter), which increased to 42.8 to 110.6 cm/h in March 2009 (austral summer). The outlet regulated mesocosms provided retention over 8 times longer than the free-draining mesocosms, while still being able to capture large events. The outlets provide adaptive management for bioretention design to improve both runoff capture and nitrogen retention.
William C Lucas; Margaret Greenway
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Water environment research : a research publication of the Water Environment Federation     Volume:  83     ISSN:  1061-4303     ISO Abbreviation:  Water Environ. Res.     Publication Date:  2011 Aug 
Date Detail:
Created Date:  2011-09-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9886167     Medline TA:  Water Environ Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  692-702     Citation Subset:  IM    
Griffith University, Nathan, Queensland, Australia.
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