Tabular view of the number of gallous contained in the clear between the brick work for each ten iuches of depth:

Diameter.

Gallons.

2 feet

equals 19

2 1/2

" 30

3

" 44

3 1/2

" 60

4

" 78

4 1/2

" 97

5

" 122

5 1/2

" ]48

6

" 176

6 1/2

" 207

7

" 240

7 1/2

" 275

8

" 313

8 1/2

" 353

9

" 396

9 1/2

" 461

10

" 489

11

" 592

12

" 705

13

" 827

14

" 959

15

" 1101

20

" 1958

25

" 3059