PointsStaff Reading (m)Difference in Elevation (m)H.I.R.L.Remarks
(BM = 105.615 m)
B.S.I.S.F.S.RiseFall
A3.005108.620105.615
12.2850.720106.335
21.5600.725107.060
31.7850.225106.835
42.1050.320106.515
B2.8753.1051.000108.390105.515TP 1
53.4650.590104.925
X3.9550.490104.435
63.1200.835105.270
73.0150.105105.375
82.5800.435105.810
91.9550.625106.435
C1.4650.490106.925
5.8804.5703.9352.625
1) Rise & fall method

     B.S. - I.S. or I.S. - F.S.
     If:
     B.S. - F.S. = +ve → Rise

     B.S. - F.S. = -ve → Fall


2) H.I. method

     H.I. = B.M./R.L. + B.S.

     R.L. = H.I. - F.S./I.S.*