In levelling across a wide river on pampanga, a reciprocal level readings were taken between point b and c as shown in tabulation. Compute the difference in elevation between B and C with instrument set up near B.

the observed elevation of point A running a Situation 2] The following data are over four different routes: line of levels Route Elevation Probable Error 340.22 m +02 m 340.30 m +04 m 3 340.26 m +06 m 4 340.32 m +08 m Determine the most probable elevation of point A in meters.

A line of levels was run from benchmarks A to B, B to C, and C to D. The elevation differences obtained between benchmarks, with their standard deviations, are listed below. What is the difference in elevation from benchmark A to D and the standard deviation of that elevation difference? (a) BM A to BM B = +12.68 ±0.10 ft; BM B to BM C = -8.23 ± 0.18 ft; and BM C to BM D = -14.66 ± 0.06 ft(b) BM A to BM B = -15.324 ± 0.022 m; BM B to BM C = -10.250 ± 0.015 m; and BM C to BM D = -16.892 ± 0.008 m

An inverse method of leveling is executed between two existing concrete structures and across a concrete wall located midway between the two structures. All rod readings, as indicated in the sketch, were taken with the rod held upside down. From the data portrayed, if the elevation of A (bottom of the concrete beam of the first structure) is 240.05 m., the elevation of the bottom of the concrete beam of the second structure (indicated as C) should be