Presentation on theme: "Click to edit section. Low-Impact Development and Green Infrastructure - EPA Low-impact development is an approach to land development (or re-development)"— Presentation transcript:
Click to edit section
Low-Impact Development and Green Infrastructure - EPA Low-impact development is an approach to land development (or re-development) that works with nature to manage stormwater as close to its source as possible. LID employs principles such as preserving and recreating natural landscape features, minimizing effective imperviousness to create functional and appealing site drainage that treat stormwater as a resource rather than a waste product. Green infrastructure refers to systems and practices that use or mimic natural processes to infiltrate, evapotranspirate, or reuse stormwater or runoff on the site where it is generated.
Click to edit section Old Style Development and Regulation ClearFillCompact Make impervious Treat/attenuate centrally
Click to edit section Low-Impact Development/Green Infrastructure Approach Maintain vegetation Minimize fill, compaction, and imperviousness Use vegetation and soils Promote infiltration Distribute treatment
Click to edit section Low-Impact Development/Green Infrastructure Examples Conservation areas Narrower streets Site design Bioretention, boiswales, biofiltration Greenroof treatment systems Pervious pavementStormwater reuse
Click to edit section Historical Hurdles for LID/GI Practices SFWMD/FDEP Environmental Resource Permit Basin Management Action Plan BMPs outside of easements Difficulty in determining if functioning as designed Magnitude makes inspection/enforcement impractical Reasonable assurance Lack of monitoring/ performance data May not be directly recognized in ERP process Lack of local design criteria
Click to edit section Helping with Regulatory Acceptance
Click to edit section Source: Evaluation of Current Stormwater Design Criteria within the State of Florida (Harper and Baker, 2007) Inadequacy of Conventional BMPs
Click to edit section Town of Melbourne Beach Challenges Facing large TMDL goal Lack of real estate for improvements Expensive cost of property acquisition Regional projects difficult Crowned median, grassed edging Impervious areas directly connected
Click to edit section Sunset Blvd Project Elements 1,000 LF median bioretention swale Use of curb and flumes to protect median Pervious pavers at median ends Native plants used, especially on west end with higher groundwater table Areas in front of lots graded for rain garden at resident’s request Normal Flow. Overflow during extreme events.
Click to edit section West End Pre and Post Construction
Click to edit section East End Pre and Post Construction
Click to edit section Sunset Blvd Performance Town received approximately 8 inches of rainfall October 7 - 9, 2011 Visual monitoring performedNo runoff observed