Low Impact Development (LID)
The implementation of Low Impact Development (LID) techniques across the United States has demonstrated that the proper implementation of LID techniques not only results in water quality protection benefits and in a reduction in the cost of land development and construction, but also bears other positive attributes that go beyond economic benefits such as enhanced property values, improved habitat, aesthetic amenities, and improved quality of life (Ventura County MS4 Permit Findings B17 (May 2009); Reducing Stormwater Costs through Low Impact Development (LID) Strategies and Practices, USEPA Doc No. EPA 841-F-07-2006, December 2007). Additionally, properly implemented LID techniques reduce the volume of runoff leaving a newly developed or re-developed area thereby lowering the peak runoff rate, and thus minimizing the adverse affects of hydromodification on stream habitat (Ventura County MS4 Permit Findings B17).
VCK advocates for all new developments and re-developments to adopt the LID provisions and standards set forth in the May 2009 Ventura County MS4 Permit (“MS4 Permit”). These provisions require the design storm volume (the 85th percentile storm; the .75 inch storm event; or 80% of the total annual runoff volume) to be retained onsite via evapotranspiration, infiltration, or harvest and re-use through limiting the effective impervious area (EIA) of the site to 5% of a site’s area. Impervious surfaces are considered ineffective or effective pervious areas if BMPs are implemented that do not allow a discharge to the MS4. For sites where retaining the storm design volume is determined to be infeasible, alternative compliance via offsite same sub-watershed mitigation is allowed that achieves the stormwater volume and pollutant treatment that would have been achieved under the Permit’s onsite LID requirements. However, all new development or re-development sites must at least achieve an EIA of 30% or less.
Click here for VCK’s Newhall Ranch Development LID Advocacy
Click here for VCK’s Ormond Beach Specific Plan LID Advocacy