The following table shows the capacity in gallons for one foot in depth of cylindrical cisterns of any dimensions. Find the diameter of any given cistern and multiply the number of gallons for one foot by the depth of the cistern, and you will have its volume in gallons :

Diameter.

Gallons.

Diameter.

Gallons.

2 feet

19

6.5 feet

206

2.5 feet

3°

7 feet

239

3 feet

44

8 feet

313

4 feet

78

9 feet

396

4.5 feet

99

10 feet

489

5 feet

122

11 feet

592

6 feet

176

12 feet

705