1901. 



AMERICAN FORESTRY ASSOCIATION. 





upon the ground, serve to break the force hpi-l,f ki r 1 1 , 



of the rain and regulate the run off x ! Kj^? &J *" ^ ^ mel 



cessive soil erosion is to a large extent These ntur , " C ? S10n *\ 



prevented, and the waters drained from ve^ a^Se r^\"^ ? 



the forests are as a rule free from sus- aled Tl L P f ? >nd 



pended mineral matter. W stor-.Z k T""? ^ "**' aVailable 



by stoiage is also being measured and 



A WELL WOODED SLOPE AFFORDING PROTECTION TO SNOW OR RAINFALL. 



The Government has set about the pro- 

 tection of the forests upon the headwater 

 streams of the West, and Congress has 

 under consideration legislation tending to 

 promote the construction of large reser- 

 voirs within or adjacent to the forest re- 

 serves. There are to be found on the head- 

 waters of the streams many valleys whose 

 outlets can be closed by a dam of moderate 



the facts recorded, so as to make it possi- 

 ble to know definitely the benefits to !>e 

 derived from the construction of these hy- 

 draulic works. 



One of the sources of anxiety and un- 

 certainty in regard to these reservoirs is 

 the matter of silt or sediment. The Hood 

 waters roll along sand, gravel, and even 

 bowlders, depositing them wherever the 



