2-A trigonometric leveling was performed to determine the elevation at Point A (

Question

2-A trigonometric leveling was performed to determine the elevation at Point A (instrument location) while collecting field measurements to Point B The following readings were taken from Point A: Zenith angle-82° 30, hi.-5.85 ft, horizontal distance to Point B = 810.25·The Rod Reading at Point B-5.85, elevation at Point B 2550.00. (20 pts) 3-Determine the missing data from the sample differential level run below. (20 pts) Station Elev 256.18 BS HI FS 4.05 5.26 2.56 253.75 TP#1 TP#2 TP#3 BM “B" 6.48 259.01 254.01 250.45 7.56 7.08

Explanation / Answer

H.I = B.S + Elevation

H.I = 256.1 + 4.05 = 260.15

Elevation = H.I - F.S

Elevation = 259.01 - 7.56 = 251.45

F.S = H.I - Elevation

F.S. = 254.01 - 245.56 = 8.45

B.S. = H.I - Elevation

B.S = 250.45 - 245.56 = 4.89

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