Plate 22



   It is essential that a farm dam have an outlet. A most significant aspect of Keyline is the type of outlet provided by the lockpipe system.

   Upper: Two men level-in with our Bunyip Level the lower half of the baffle plates in the lockpipe trench. The picture is taken looking up to the inside of the dam. The baffle plates on the inside portion of the wall are closer together than towards the rear of the wall near the men. (See Chapter XVIII.)

   Lower left: The U section rubber gaskets being fitted to the lower half of the baffle plate. This rubber gasket encircles the pipe between the two coupled-up sections of the baffle plate. Lower right: The lockpipe equipment in position ready for the filling of the trench.