special Features 



229 



down the bank for the sake of exhibiting a waterfall that 

 may be constructed from the overflow, must be carefully kept 

 on ground above the level of the water that it may not even 

 appear dangerous. It may indeed be held as an established 

 rule that water should not be allowed to be seen from a point 

 where it seems to be higher than the ground on which the 

 observer stands. 



In making purely artificial pieces of water, the depth 

 should not be allowed to exceed from four to five feet and 



Fig. 62. Forming the Bank of a Lake. 



the slope of their banks must not be too steep while it should 

 blend nicely with the ground around. Fig. 62 will exem- 

 pUfy, in section, a good form for such banks. And it will 

 also show from b upwards how the banks can be pitched 

 with stone so as to preserve them from being washed away 

 by the action of winds on the water. The stones can either 

 be rough boulders, more irregular small blocks set on edge, 

 or in large flatfish masses. They should be well bedded 

 into the bank, extend two feet (in vertical depth) below the 

 surface of the water, and present a somewhat rugged face. 



