(a) The intent of planning a major flood path is to ensure that the storm water runoff, which exceeds the capacity of the storm sewer system, shall have a route to follow which will not cause the loss of property or life.
(b) The combination of the major flood path and sewer/ditch system shall have the capacity to carry runoff from a 100-year frequency storm. Where the street is designated as the major drainage way, the depth of flow shall not exceed eight inches at the face of curb. When the major drainage way is located outside a street right-of-way, utility and floodway easements shall be provided and a grading plan is to be submitted with detailed elevations showing the flood being contained in this area.
(c) Minimum garage, first floor and minimum window opening elevations along all 100-year flow routes are to be set by the design engineer. These elevations are to be a minimum of one foot above the 100-year water elevation. These elevations are to be clearly labeled on the plans and the subdivision plat.
(d) Since streets may be used as a routing path, the major system must be taken into account in the initial design of the development. It shall be designed in such a manner as to direct the storm water into the detention or retention area. Calculations indicating the capacity of the Major Flood Path and the excess storm water runoff from the sewer/ditch system shall be provided.