Storm water runoff from a subdivision shall be collected and conveyed by a drainage system approved by the Director of Public Works. Maximum runoff shall be computed using the Rational Method. The Rainfall Intensity - Duration Curve, for Eureka, and “C” values approved by the Director of Public Works shall be used in computation. Runoff design shall accommodate the full and anticipated future development within the drainage area. In cases where the drainage areas are undeveloped, fully improved conditions shall be determined by the designation of the area on the General plan or the zoning classification of the area. The drainage system shall provide for the protection of the abutting properties that would be adversely affected by any increase in runoff attributed to the development, for which off-site storm drain improvements may be required. (Ord. 1758, § 1, 11/12/1986)