Design analyses are conducted when the level of detail in a normal scoping process is not adequate to develop a solution and associated cost estimate for a specific situation. The design analysis provides a level of detail that identifies enough of the construction details to determine the feasibility of the solutions and to provide a close approximation for cost estimating purposes. Design analyses are done for projects that are expected to go to design in the upcoming biennium. But design analyses can also provide information for right-of-way preservation and for future projects.
A typical design analysis may involve highway alignment issues, especially when either the built or natural environment creates significant challenges to establishing centerline and right-of-way boundaries. The purpose of a design analysis is to provide detailed scoping information where complex design issues, such as alignment, are present.
Because the design analysis most likely does not include the elements of the corridor study or route development plan (but may become or feed into one), the specific elements will relate to the specific design of the project under consideration. The components included in the analysis must be sufficient to ensure that the solution proposed is constructible, and in accordance with applicable/deliverable design requirements.
Design Analysis provides a more detailed analysis of the design issues conducted along with a scoping effort.
Scoping is the first step taken in developing a project estimate. It is a detailed look at need for the project, possible environmental impacts, roadway design matters, and stakeholder issues.
Biennium - An accounting period of 25 months, used by WSDOT and the State, which starts July 1st of the odd year and ends on June 30th.