4.10 Design Period
a. Mainline and Lateral Sewers.
1) Mainline and lateral sewers shall be designed for the ultimate development of the tributary area. Consideration shall be given to the maximum anticipated capacity of institutions, industrial parks, commercial establishments, etc.
b. Trunk Sewers.
1) Selection of the design period for trunk sewers shall be based on evaluation of functional and other considerations. Some of the factors that should be addressed in the design of trunk sewers are:
a) Solids deposition, odor, and pipe corrosion at initial flows.
b) Effect of sewer sizing on land use and development.
c) Population and economic growth projections and the anticipated accuracy of these projections, coupled with the comparative costs of staged construction and the anticipated manner in which the future improvements will be funded.