What is Effective Impervious Area (EIA)?
This is the portion of the total project area that cannot absorb storm water runoff, expressed as a percentage. Impervious surfaces may be rendered “ineffective” if the stormwater runoff is fully retained onsite. In other words, any impervious area can become effectively pervious that collects and fully retains the design storm. For example, a parcel with 5% EIA in the Ventura County Permit means that the design storm runoff from 95% of the impervious area is retained – either infiltrated, reused, evapotranspired, or in some way used – on-site.
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- What is Effective Impervious Area (EIA)?
