Corona regulates grading and site drainage under Municipal Code Title 15 and California Building Code Appendix J. Grading permits are required for any project moving 50 or more cubic yards or altering drainage patterns. All sites must direct runoff to approved drainage systems without impacting neighbors.
Grading and drainage in Corona are regulated under Municipal Code Title 15 and California Building Code Appendix J. A grading permit is required for any cut or fill of 50 cubic yards or more, any grading on slopes steeper than 5:1, or any work that alters existing drainage patterns. Applications require a grading plan prepared by a registered civil engineer showing existing and proposed contours, drainage devices, retaining walls over 4 feet, and erosion control measures. The plan must demonstrate that runoff will not be discharged onto adjacent properties without legal drainage easements. Site drainage must convey the 100-year storm to an approved outlet (street, storm drain, or natural watercourse). Lots must slope away from foundations at a minimum 2% grade for the first 10 feet. Retaining walls over 4 feet (measured from bottom of footing) require separate building permits and structural calculations. Hillside grading triggers slope-density requirements limiting the amount of cut and fill, and requires geotechnical reports addressing slope stability. Inspections occur at rough grade, fine grade, and final. As-graded plans signed by the engineer of record must be submitted before certificate of occupancy.
Specific penalty amounts for this ordinance are not published in a publicly accessible fine schedule. Contact Corona code enforcement directly for current fines, enforcement procedures, and hearing options.
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