Department Bulletin 1430 
Plate 
PHOTO BY F. E. BONNER 
A Region Where Forests Have High Protective Value 
Fig. 1. — Huntington Lake, southern Sierras of California. Along the lower Sierras long 
periods without rain are broken by a short rainy season often marked by most concentrated 
precipitation. As a result ground cover is often thin or lacking. At Springville 42 inches 
of rain has fallen within a month. In seven consecutive months of the same year less than 
2 inches fell. Similar concentrated precipitation is recorded at Summerdale, North Fork, 
Milo, Huntington Lake, Hot Springs, and other places in the southern Sierras 
PHOTO BY FEDERAL POWER COMMISSION 
High Value of Forest Cover 
Fig. 2.— Reservoir in Yuba County, Calif., on North Fork of Yuba River. A region of pre- 
vailingly low but often concentrated and irregular precipitation, and subject to destructive 
erosion of naked soil 
