436 



WOOD-DEPOTS. 



and a stouc ovoiHow weir (a', />'). This cbunlic'l is wideiicd-out 

 into the reservoir A, and m, m, Sec. are outlets between solid 

 hewn stone masonry walls, which can be closed by means of 

 gratings and sluice-gates. The flow of water through these out- 

 lets may be increased by means of culverts (s, s), which are 

 covered with gratings (fig. 258). From A, the floating wood 

 passes into the preliminary collecting basins B and B', and, in 



Fig. 260. 



case of necessity, water can be removed from them by means of 

 the culvert (s) and the canal (//). B and B' serve to distribute 

 the wood into the basins 1, 2, 3 and 4, whilst the more remote 

 basins 5 and 6 are supplied from B by the canal {z). The 

 outlet iy) leads the water back into the river Traun. 



In all mountain-streams where floods occur, sawmills, as well 

 as wood-depots, are placed in side-channels. This is essential, 

 so that each mill may obtain its water-power separately and leave 

 the main stream free for other mills and for floating purposes. 

 In fig. 2G0, the stream A is closed by a long lateral boom {iit) at 

 the outlet of the mill-stream B. At {n) is a second boom with a 

 removeable grating, behind which are sluice-gates, so that both the 

 water and the floating wood maybe under control ; {a, a, a . . .) 

 are outlets. The sawmills {k, k) receive the butts directly by 

 water, and the sawn boards are bound into rafts below the mills 

 and rafted down-stream. 



(b) Method of Landing and storing Floated Wood. — As soon as 

 the wood has been collected in front of a boom, the measures 



