TVA Monograph No. 75, Chapter 6: Final Layout

Before the final layout is made, the number of construction stages and the portion of the project in each stage must be known. This chapter then lists what must be settled: an adequate channel for stream flow and navigation during each stage, enough room inside each enclosure for the work, construction features such as berms, ramps, cutoff walls, drainage, and sumps, and any earth dikes that can reduce the number of steel cells needed.

It advises keeping each enclosure as small as is economical, while leaving room for ramps, construction bridges, berms, and equipment. It also covers auxiliary structures, including earth dikes with sheet pile cutoff walls in shallow water, and the detailing of the cells themselves.

Detailing covers how right- and left-hand tees and intervening piles are shown on the drawings, how a table can list pile lengths where bedrock is irregular, why deflection angles in the alignment can only be made in multiples of the angle per pile, and how tie-ins to other structures must be worked out together with the cell alignment to avoid costly changes later.