This cross-section, though not to scale, gives a good general impression of the operations at Mangahao. In order to get the details into reasonable limits, the drawing has been compressed longitudinally, so that the hills are out of proportion, To the left will be seen the main Mungahao dam, with its two huge retaining walls. Thence the water will pass under the Tokomaru ridge by means of a tunnel a mile iong to the Arapeti Valley. Here it will be contained in the second dam, and will be led though another tunnel a mile and a-half long to the surge chamber on he shannon side of .the ranges. Tile pipe lines carry the water thence down the hill side, a drop of 900 feet to the generating plant at the foot, whence the transmission lines will radiate all over the country. Approximately 24,000h.p. will be developed, of which half will be absorbed by Wellington city.

Manawatu Herald, Volume XLIII, Issue 2271, 3 May 1921, Page 4

This cross-section, though not to scale, gives a good general impression of the operations at Mangahao. In order to get the details into reasonable limits, the drawing has been compressed longitudinally, so that the hills are out of proportion, To the left will be seen the main Mungahao dam, with its two huge retaining walls. Thence the water will pass under the Tokomaru ridge by means of a tunnel a mile iong to the Arapeti Valley. Here it will be contained in the second dam, and will be led though another tunnel a mile and a-half long to the surge chamber on he shannon side of .the ranges. Tile pipe lines carry the water thence down the hill side, a drop of 900 feet to the generating plant at the foot, whence the transmission lines will radiate all over the country. Approximately 24,000h.p. will be developed, of which half will be absorbed by Wellington city.