A. Drainage Generally. All graded sites shall be developed and maintained to provide control of storm and surface waters. Adequate provisions shall be made to prevent storm or surface waters from damaging the face of an excavation or the sloping face of a fill, and to prevent grading or other construction activity from causing significant concentration or acceleration of drainage entering adjacent property without an easement from the owner of the adjacent property, which shall be in a form approved by the city attorney and recorded at the Washington County Department of Assessment and Taxation. All drainage provisions shall be subject to the approval of the city engineer and shall be designed to maintain all storm and surface water draining on site or to carry all or part of storm and surface waters to the nearest practical street, storm drain, or natural water course, approved by the city engineer as a safe place to deposit and receive such waters.

B. Building Pad. Building pads on graded sites shall be sloped at a minimum of two percent to the street or an approved drainage device.

C. Subdrainage. When the city engineer considers it necessary, adequate subdrainage shall be provided in connection with fills.

D. Control of Excessive Runoff.