Complete design data, assumptions and computations, in accordance with sound engineering practice, shall be submitted to substantiate hydraulic and structural designs. (Ord. 3153 § 2 (Exh. C), 2010; Ord. 2100 § 1, 1985; Ord. 1369 § 2, 1971; prior code § 28.302(4). Formerly 18.16.060).