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Unless otherwise recommended by a qualified engineer and approved by the Planning Director as provided below, drainage across property lines shall not exceed, in quantity or concentration, that which existed prior to grading. Excess or concentrated drainage shall be contained on site or directed to a county-approved drainage facility. Erosion of the ground in the area of discharge shall be prevented by installation of nonerosive down drains or other county-approved devices.

When surface drainage is discharged onto any adjoining property, the following shall apply:

A. Drainage shall be discharged in such a manner that it will not cause erosion or endanger any cut or fill slope or any building or structure;

B. A report of drainage calculations and design recommendations (which may include, but not be limited to, culvert sizing, adequate energy dissipation, existing drainage ditch capacity improvements, sufficient leach area, etc.) shall be prepared by a qualified civil engineer;

C. A drainage plan shall be designed by a qualified civil engineer, incorporated into the plans, and include reference to the drainage calculations report;

D. If the discharge is to public property, an approved encroachment permit or special use permit shall first be obtained from the agency having jurisdiction over the affected property, prior to issuance of a grading permit. If the discharge is to private property, a drainage and maintenance easement may be drafted, approved by the county, then recorded evidencing the grant of easement by the affected property owner/s, prior to issuance of a grading permit; or a lot line adjustment may first be approved by the county and recorded; or other legal method allowing sufficient containment and control of drainage to meet the above provisions.