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Impervious Surface Requirements for Residential Uses TABLE 4.2.5.1: IMPERVIOUS SURFACE REQUIREMENTS (RESIDENTIAL) DISTRICT IMPERVIOUS SURFACE/DETENTION POND REQUIREMENTS (RESIDENTIAL) UNIV-CA UNIV-PW 6% impervious surface limit. EXCEPT for all lots which existed prior to 4/2/90, which are subject to impervious surface limits as provided in the following Table (entitled Sliding Scale for Residential Impervious Surface Ratios – Univ, Cane, and Little). [1], [2] Lots shall either be a minimum of 2 acres in area, exclusive of any right-of-way or access easement, or created in accordance with established density regulations through the subdivision process to qualify for additional impervious surface allocation as detailed in Section 4.2.8 (C). CANE-CA CANE-PW 6% impervious surface limit. EXCEPT for lots smaller than two acres which existed prior to 1/1/94, which are subject to impervious surface limits as provided in the following Table (entitled Sliding Scale for Residential Impervious Surface Ratios – Univ, Cane, and Little). [1], [2] Lots shall either be a minimum of 2 acres in area, exclusive of any right-of-way or access easement, or created in accordance with established density regulations through the subdivision process to qualify for additional impervious surface allocation as detailed in Section 4.2.8 (C). U-ENO-CA 6% impervious surface limit. EXCEPT for lots smaller than five acres which existed prior to 6/1/2010, which are subject to impervious surface limits as provided in the following Table (entitled Sliding Scale for Residential Impervious Surface Ratios – Upper Eno). [1], [2] LITTLE-PW 6% impervious surface limit. EXCEPT for lots which existed prior to 1/1/94, which are subject to impervious surface limits as provided in the following Table (entitled Sliding Scale for Residential Impervious Surface Ratios - Univ, Cane, and Little). [1], [2] Lots shall either be a minimum of 2 acres in area, exclusive of any right-of-way or access easement, or created in accordance with established density regulations through the subdivision process to qualify for additional impervious surface allocation as detailed in Section 4.2.8 (C). FLAT-PW HYCO-PW 12% impervious surface limit for new and existing lots. [1], [2] U-ENO-PW BACK-PW 12% impervious surface limit for existing and new lots outside of Transition Areas as designated in the Orange County Land Use Plan. [1], [2] 30% impervious surface limit for developments which exceed a density 1 du/acre within Transition Areas as designated in the Orange County Land Use Plan. Stormwater Management Plans (SMPs) and/or Stormwater Control Measures (SCMs) are required if impervious surface exceeds 12%. 70% impervious surface limit for residential uses developed at “high intensity” densities (R- 5, R-8, and R-13) in an Economic Development District as designated in the Land Use Element of the Comprehensive Plan (high-density option) with SCMs if ISR exceeds12%. L-ENO-PW 24% impervious surface limit with curb and gutter. 36% impervious surface limit without curb and gutter. [1], [2] 70% impervious surface limit for residential uses developed at “high intensity” densities (R- 5, R-8, and R-13) in an Economic Development District as designated in the Land Use Element of the Comprehensive Plan (high-density option), with Stormwater Management Plans (SMPs) and/or Stormwater Control Measures (SCMs) required when impervious surface exceeds: 24% (w/ curb and gutter); or 36% (w/o curb and gutter). HAW-PW JORDAN-PW 24% impervious surface limit. [1], [2] [1] Allowable impervious surface area may be modified in accordance with Section 4.2.8 of the UDO. [2] Regardless of the proposed amount of impervious surface area, a Stormwater Management Plan (SMP) and/or Stormwater Control Measure (SCM) may still be required based on the proposed amount of land disturbance on a given parcel of property in accordance with applicable Orange County Erosion Control and State Stormwater regulations. 115