FIG. |-- ISOHYETAL MAP BASED 
ON SEA LEVEL CONDITIONS . 
FROM WATER POWERS OF 
SOUTHEAST ALASKA, 1947. 
FEDERAL POWER COMMISSION & 
U.S. FOREST SERVICE. 
NOTE + ARITHMETIC MEAN PRE-— 
CIPITATION VALUES FURNISHED 
BY THE U. S. WEATHER BUREAU 
WERE ADJUSTED BY H. J. 
THOMPSON TO A LONG PERIOD 
BASIS BY COMPARISON WITH 
THE SITKA RECORD, ADJUST — 
MENT COEFFICIENT VARIED 
FROM 0.740 TO 1.040, 
— | 
Qs eee = a TS ees Mecamnes see se 
cum SS es pa ee ee _—-> 
