The final subdivision map shall include and shall have appended to it sufficient data for the City Engineer to check the drainage system as proposed by the subdivider. The following data shall be provided:
(a) Hydrologic Calculations. At all critical points within the subdivision the following information shall be shown.
(1) Tributary drainage areas delineated on the map.
(2) Times of concentration.
(3) Intensity.
(4) Run-off coefficients.
(5) Design flow.
(b) Hydraulic Calculation.
(1) The plan and profile of all drainageways shall be provided including a cross section of open channels showing the maximum depth of flow.
(2) Sizes and types of drainage improvements shall include all special structures, typical sections, and easement widths.
(3) Supporting calculations for upstream and downstream channel capacities as they affect overflow or backwater within the subdivision. Such calculations shall be substantiated by such additional survey information as is required to determine profile and cross-section of the upstream and downstream channel reaches under consideration.
(4) Sufficient contours and grading details to indicate proposed street grades and elevations and site grades and elevations throughout the subdivision.
(Ord. 25-1980. Passed 9-2-80.)