PRECIPITATION 

 ON LAND 



DIVERSIONS ^ 



^^ ^ 





'T? 



INFLOW FROM 

 EAST RIVER 

 9,200 bgy + 



GROUND-WATER 

 DISCHARGE L I 



750 bgy 



630bq, 



/' 



EXCHANGE WITH 

 BLOCK ISLAND SOUND 

 INFLOW 64.000 bgy 

 OUTFLOW 70,600 bgy 

 9.200 bgy * 



EVAPORAl ION 



EVAPOTRANSPIRATION 



% NET INFLOW FROM EAST RIVER OF 9, 200 bgy may be s,gnilicenlly in error. 



Figure 1. General pattern of water circulation and estimated average quan- 

 tities of water involved in billions of gallons per year (bgy). Blocks 

 drawn to scale. The water volume in the Sound itself is approximately 

 16,800 bi 11 ion gal Ions. 



Passing storms bring clouds, wind, rain and snow. Average 

 annual precipitation in the Long Island Sound Region ranges from approximately 

 36 to 51 inches (1.7 to l.k million gallons per day per square mile) and has 

 fairly equal monthly distribution. The minimum average annual precipitation 

 over the land, 38 to kk inches, occurs along the north shore of Long Island 

 and the south shore of Connecticut between Norwalk and Guilford. The maxi- 

 mum over Long island, kh to 48 Inches, occurs along an east-west axis 

 centered near Lake Ronkonkoma, and in Connecticut, 46 to 51 inches, over 



