■1 7.29 + 6.47 lnX 
0. 80 
•w» 
•mo 
• 1017 
• 101 * 
• mi 
• mi 
• 1022 
'•a ^ 
• • 1020 
3000 
2000 
10 20 % 30 40 
l 10 A.F. 
Fig. 7A. The relationship between annual salmon catch in the Sacramento- 
San Joaquin rivers and upper San Francisco Bay and the mean regulated 
Delta outflow to San Francisco Bay for five running years. Each salmon 
catch is the amount caught in the last year of five previous running 
years of outflow (e.g. salmon catch for 1918 is based on outflow for 
1914-1 91 9) . 
3000 
2000 
1000 
0 
-1_,_I_._l_ 
2.0 4.0 6.0 
KM 
Fig. 7B. Ibe relationship between annual commercial salmon catch in the 
Sacramento-San Joaquin rivers and upper San Francisco Bay and the mean 
Delta regulated outflow for a period of three running months (April-May- 
June). Each year's salmon catch is based on a lag outflow period of two 
years after the last spring Delta outflow to the Bay and for two years 
previous (e.g. salmon catch for 1916 is based on Apri1-May-June outflow 
for 1912-1 91 4). 
51 
