Problem: A vertical angle of -15°30' was measured to the top of an elevated water tank from an instrument set up on a hill 225.67m away. The height of instrument set up 1.22m above the ground whose elevation is 302.56m above sea level. If the height of the water tank above ground is 30.20m, determine the elevation of the base of the water tank considering the effect of earth's curvature and atmospheric refraction. Given: α = 15°30' (angle of depression) D = hor. Dist. = 425. 67m hi = 1.22m, ht. of instrument Ground elevation at the instrument set up= 302.56m Height of water tank = 30.20m Required: Elevation of the base of the water tank. Line of sight a V (vert. dist.) hi-1.22m Elev. 302.56m 30.20m Elevation of base Hor. Dist. - 425.67m
Problem: A vertical angle of -15°30' was measured to the top of an elevated water tank from an instrument set up on a hill 225.67m away. The height of instrument set up 1.22m above the ground whose elevation is 302.56m above sea level. If the height of the water tank above ground is 30.20m, determine the elevation of the base of the water tank considering the effect of earth's curvature and atmospheric refraction. Given: α = 15°30' (angle of depression) D = hor. Dist. = 425. 67m hi = 1.22m, ht. of instrument Ground elevation at the instrument set up= 302.56m Height of water tank = 30.20m Required: Elevation of the base of the water tank. Line of sight a V (vert. dist.) hi-1.22m Elev. 302.56m 30.20m Elevation of base Hor. Dist. - 425.67m
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Problem:
A vertical angle of -15°30' was measured to the top of an elevated water tank from an
instrument set up on a hill 225.67m away. The height of instrument set up 1.22m above
the ground whose elevation is 302.56m above sea level. If the height of the water tank
above ground is 30.20m, determine the elevation of the base of the water tank considering
the effect of earth's curvature and atmospheric refraction.
Given:
α = 15°30' (angle of depression)
D = hor. Dist. = 425.67m
hi = 1.22m, ht. of instrument
Ground elevation at the instrument set up= 302.56m
Height of water tank = 30.20m
Required:
Elevation of the base of the water tank.
Line of sight
C
V (vert. dist.)
hi=1.22m
Elev. 302.56m
30.20m
Elevation of base
Hor. Dist. - 425.67m
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