The following words and phrases shall be defined as follows:
DEVELOPED PARCEL: Any parcel that has been altered from its natural condition by grading, filling, or the construction of improvements or other impervious surfaces.
EQUIVALENT RESIDENTIAL UNIT ("ERU"): The average amount of impervious surface, expressed in square feet, on developed single-family residential parcels in South Weber. One ERU equals two thousand eight hundred (2,800) square feet of impervious surface area.
IMPERVIOUS SURFACE: Any hard surface, other than the natural surface, that prevents or retards the absorption of water into the soil, or that causes water to run off the surface in greater quantities or at greater rates of flow than the natural surface. (Ord. 07-14, 6-12-2007)