(1) Site grading shall be performed taking into consideration the drainage patterns of adjacent improved and unimproved property and treating upstream areas, where appropriate, as though fully improved.

(2) In every Subdivision, provision shall be made for the satisfactory drainage of storm water by means of underground storm drain pipes or swales constructed in accordance with the City’s adopted Engineering Standards. No storm water lines may be connected or constructed so as to flow into sanitary sewers. Major Natural Drainage Courses shall not be appreciably altered from their natural condition except for stabilization and erosion control. Subdividers shall comply with all ordinances relating to Flood control and storm drainage.

(3) Storm water drains shall be installed as shown on the Subdivision Development Plans.