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acres of citrus additional water Adequate flood American Society Civil Angeles area available for human boulders burned area burned watersheds channel gravels channels and levees chaparral croplands cubic yards dams debris Debris-laden divert downstream drainage erosion fire and water fire control Fish Canyon flood control flood protection Forests and Streamflow H. C. Forests high flows high stream flow Hoyt increase Irrigation larger supply Lined channels Lowdermilk Matilija burn mountain canyons mountain watersheds mud and rock mud flows muddy National Forest normal Pacific Ocean provided quate rainfall rains receive a larger records obtained require protection reservoirs resting place result of burning River Santa Ana Santa Anita Canyon sluiced Society Civil Engineers soil southern California square miles storm flows stream banks stream channels stream courses stream-bank summer flow supply of sand thunderstorm Troxell unburned underground valley lands vegetative cover wasted water supply water yield Wheeler Springs winter and spring worth of damage