Typical Dimensions
Inside
Diameter
in Feet
Capacity in Millions of Gallons
0.1 0.25 0.5 1.0 1.5 2.0 3.0 4.0 5.0
30 18'11"                
40 10'8" 26'7"              
50   17'0"              
60   11'10" 23'8"            
70     17'4" 34'9"          
80     13'4" 26'7" 39'11"        
90       21'0" 31'6"" 42'0"      
100       17'0" 25"6" 34'0"      
110         21'1" 28'2" 42'0"    
120   WATER DEPTH
Red numbers indicate
most economical
dimensions.
  23'8" 35'5"    
130       30'3" 40'3"  
140       26'1" 34'9" 43'5"
150               30'3" 37'10"
160               26'7" 33'3"
170                 29'5"