A. Roadway plans and profile shall be prepared in ink on approved mylar federal-aid sheets with a standard four and one-fourth inches by seven inches Skamania County title block, and shall be signed and sealed by a Washington registered professional engineer. Minimum data on the face of the plan shall in all cases be sufficient to allow a resurvey of the improvement in the future. Design data on all natural factors, such as terrain, rainfall and drainage, shall be provided in support of the proposal.
B. Storm drainage will be designed to protect the roadway against surface and subsurface water, conveying water across, along and away efficiently without damage to roadway or adjacent property.
1. All facilities shall be designed to accommodate, at a minimum, the flow from a twenty-year flood. No cross-roadway culvert shall be less than eighteen inches in diameter.
2. Roadway ditches shall be a minimum of two feet in depth, with side slopes of two to one or flatter.
C. Right-of-way width shall be sixty feet minimum, but in no case less than that required to include all features of the improvement that will require continued county maintenance attention. The entire right-of-way shall be cleared at the time of the construction.
D. Basic roadway design standards are as set out in Table 12.01.030. (Ord. 1981-05 (part))