In addition to the grading permit requirements of chapter 70 of the uniform building code, information on plans shall include the following:
A. A map showing the tributary drainage area or areas and estimated runoff, expressed in cubic feet per second, together with supporting calculations signed by a registered engineer;
B. The concrete or gunite interceptor and storm drain construction details, with its size, slopes and capacity to be justified by supporting calculations signed by a registered engineer. Seventy eight hundredths of an inch (0.78") per hour, estimated 10-year storm, shall be the minimum criteria for design of such interceptor or storm drains. (Prior code § 86003)