^ter in streams. 



i 



;ii 



"*lgof snow in the mount- 



^^unt o- annual snows. .. 



pelting of the snows . . . 



Effect of forests on the water supply. 



Beneficial; distributing the water through the 

 summer season. 



To an extent they control the water supply; as 

 forests are destroyed the supj.ly decreases. 



Prevent early melting of snow and rapid evap- 

 oration. 



Water supply governed by the snows; not de- 

 pendent on the forests. 



Forests necessary to a late supply of water. 



