Table 2. Comparison of swelling pressures in 1997 and 1998

R.D. Swelling Pressure in kg per cm2 in the year
1997 1998
39.5 10.45 0.56
40 11.52 0.78
42.5 10.8 1.58
45 10.15 2.60
47.5 14.81 0.68
50 6.97 0.20
52.5 4.57 0.16
55 3.93 0.16
57.5 2.30 0.22
60 2.50 0.10