STORM-EZ – Partnershipsnorthcarolina.apwa.net/content/chapters... · Balancing water quality...
Transcript of STORM-EZ – Partnershipsnorthcarolina.apwa.net/content/chapters... · Balancing water quality...
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STORM-EZ – Partnerships
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STORM-EZ – Challenges Addressing the Problem
Continued water quality degradation despite increased regulation
Balancing water quality protection with economic development
Paperwork for multiple SCMs complicates permitting
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STORM-EZ – Solutions Changing Behaviors
Change in hydrology metrics
Application, Calculations, O&M in on spreadsheet
Variable sizing & credit based on SCM type
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STORM-EZ - Paperwork
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STORM-EZ - Paperwork
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Conventional Development LID Development
Hybrid Developments
STORM-EZ – Flexibility
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STORM-EZ – Discrete CN Method
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STORM-EZ – Discrete CN Method
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Runoff from Impervious Surfaces
Runoff from Open Space +
= Total Runoff
STORM-EZ – Discrete CN Method
Initial abstraction of pervious areas cannot influence runoff from impervious areas
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LARGER SCMs (EQUIVALENT OR BETTER
TREATMENT, BUT INCREASED DEVELOPMENT COSTS)
SMALLER SCMs (REDUCED WATER QUALITY
PROTECTION – NOT EQUIVALENT)
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STORM-EZ – Discrete SCS Method
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STORM-EZ – P90 Storm & State Rules
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STORM-EZ – P90 Storm & State Rules
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STORM-EZ – SCM Crediting New SCM Sizing Methods
Credit based on SCM type and soil type
Undersized SCM’s OK
Treatment Trains OK
Fate of Rainfall
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Fate of Rainfall
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Fate of Rainfall
Storage Volume
Bypass Volume
Post Filtration Discharge & Treated Outflow
Infiltration
Evaporation & ET
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STORM-EZ – SCM Crediting
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STORM-EZ – SCM Crediting
Stormwater Control Measure
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STORM-EZ – SCM Credits
Wetland
Wet Detention
Bioretention
Bioretention w/IWS
85% TSS Removal
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Why Pursue Volume Matching?
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QUESTIONS?