Delivering the pipe to site would present as great a problem as laying the line and the rate of laying might well depend on this factor. If, however, unrestricted use of the existing railway and roads can be presumed with an adequate supply of the special rail and road trucks required, there would be no special difficulty. After that the number or laying gangs which can be made available would be the deciding factor. In estimating the 12 months period, erection work on all the pumping stations simultaneously is presumed.