Liquid Depth (inches)	Barrels	Air Gap (inches)
3	8.31	69
6	16.62	66
9	24.93	63
12	33.24	60
15	41.55	57
18	49.86	54
21	58.17	51
24	66.48	48
27	74.79	45
30	83.1	42
33	91.41	39
36	99.72	36
39	108.03	33
42	116.34	30
45	124.65	27
48	132.96	24
51	141.27	21
54	149.58	18
57	157.89	15
60	166.2	12
63	174.51	9
66	182.82	6
69	191.13	3
72	199.44	0