equivalent to 1.62 cfs per square mile or 6,200 billion gallons per year and 

 varies from 14,000 to 37,000 cfs as shown on Figure 8, 



Figure 8. Estimated annual inflow to Long Island Sound 1929-70. The graph 

 indicates that one calendar year can bring almost three times as much fresh 

 water inflow as another. 



Average annual runoff from the Thames River basin is 1 .64 cfs 

 per square mile. This is slightly greater than the rate of runoff from the 

 Connecticut and Housatonic River basins (1.62 and 1.61 cfs per squara mile, 

 respect i vej 1 y) . The distribution of average annual runoff in the maini'and 

 part of the region is shown on Figure 9. 



Average monthly runoff to the Sound varies from 4.0 cfs per 

 square mile in April (65,100 cfs, or 1,250 billion gallons) to 0.6 cfs per 

 square mile in September (9, 800 cfs, or 190 billion gallons); monthly inflow 

 to the Sound has been as high as 139,000 cfs and as low as 4,300 cfs, in the 

 period of record beginning in 1928. The average monthly runoff for the cal- 

 endar year period 1941-70 is shown on Figure 10. 



20 



