Liquid Depth (inches)	Barrels	Air Gap (inches)
3	2.175	135
6	4.350	132
9	6.525	129
12	8.700	126
15	10.875	123
18	13.050	120
21	15.225	117
24	17.400	114
27	19.575	111
30	21.750	108
33	23.925	105
36	26.100	102
39	28.275	99
42	30.450	96
45	32.625	93
48	34.800	90
51	36.975	87
54	39.150	84
57	41.325	81
60	43.500	78
63	45.675	75
66	47.850	72
69	50.025	69
72	52.200	66
75	54.375	63
78	56.550	60
81	58.725	57
84	60.900	54
87	63.075	51
90	65.250	48
93	67.425	45
96	69.600	42
99	71.775	39
102	73.950	36
105	76.125	33
108	78.300	30
111	80.475	27
114	82.650	24
117	84.825	21
120	87.000	18
123	89.175	15
126	91.350	12
129	93.525	9
132	95.700	6
135	97.875	3
138	100.050	0