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==Weirs==
 
==Weirs==
 
https://books.google.ca/books?id=fTQWDQAAQBAJ&dq=Jefferies+Scotland+Swales+2004&source=gbs_navlinks_s
 
https://books.google.ca/books?id=fTQWDQAAQBAJ&dq=Jefferies+Scotland+Swales+2004&source=gbs_navlinks_s
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See also [[blue roofs]]
    
==Low flow devices==
 
==Low flow devices==
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