STORM-EZ – Partnerships

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

STORM-EZ – Solutions Changing Behaviors

Change in hydrology metrics

Application, Calculations, O&M in on spreadsheet

Variable sizing & credit based on SCM type

STORM-EZ - Paperwork

STORM-EZ - Paperwork

Conventional Development LID Development

Hybrid Developments

STORM-EZ – Flexibility

STORM-EZ – Discrete CN Method

STORM-EZ – Discrete CN Method

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

LARGER SCMs (EQUIVALENT OR BETTER

TREATMENT, BUT INCREASED DEVELOPMENT COSTS)

SMALLER SCMs (REDUCED WATER QUALITY

PROTECTION – NOT EQUIVALENT)

STORM-EZ – Discrete SCS Method

STORM-EZ – P90 Storm & State Rules

STORM-EZ – P90 Storm & State Rules

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

Fate of Rainfall

Fate of Rainfall

Storage Volume

Bypass Volume

Post Filtration Discharge & Treated Outflow

Infiltration

Evaporation & ET

STORM-EZ – SCM Crediting

STORM-EZ – SCM Crediting

Stormwater Control Measure

STORM-EZ – SCM Credits

Wetland

Wet Detention

Bioretention

Bioretention w/IWS

85% TSS Removal

Why Pursue Volume Matching?

QUESTIONS?