Fall_2006_271_survey_exam_2_solutions

# Fall_2006_271_survey_exam_2_solutions - CE 271 Exam No 2...

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Unformatted text preview: CE 271 Exam No. 2 Name MZOLFF Surveying Portion (50 pts) .. please show your work Fall 06 1. (6 pts) Draw ﬁve foot contours (400, 405, etc.) 408 402 that ﬁt the spot elevations —|— —|— shown. Use solid lines. @eacé error \ 2. (4 pts) Trace the path of +41\2 a raindrop falling at the 418 spot elevation. Use a dashed ' 410 line with an arrow. \ 18 v + / 4‘5 @9856 am MS 3. (16 pts) Shown at right are several segments of an open traverse. Point F has coordinates (in ft) of N 4000.00 E 6000.00 Line FG has a bearing of S 60': E. I Determine the following: \vlz'i war 0 Azimuth FG IZQ 11. O Bearing GF N w Azimuth GF I Latitude FG . i 1‘ +3] 46 (A 325 0413.36 or 325 Sm 66 Departure FG ' “:4‘100-mz’50 Coordinates of G M so E 4281A" @000 4- am .46 The deﬂection angle of line GH is 20“ left of the forward extension of PG. What is the azimuth of GH? : 10.26sz [20 “'20 =100 \[l— CE 271 Exam No. 2 Name Wot/QC Surveying Portion (50 pts) .. please show your work Fall 06 4. (12 pts) Shown below is a proﬁle survey and design cross-section for a 12 inch sewer and two manholes. To build the sewer, a trench with vertical sides will be cut in hard clay from the ground surface to the bottom of the sewer. The trench will be three foot wide in the direction “into the paper.” 870_ ._ “(M/u.- .# _ are aso % “ 5’50 _ _ . ' . r. . - 0+00 I +00 2+00 3+00 44-00 5+00 Making any reasonable simpliﬁcations that you wish. determine how many cubic ft of soil must be excavated. Show your work. To exp/arr? further; the yotome you are to estrrnate is the area to the ﬁgure abo ye between the ground surface and the bottom of the sewer. mo/trp/reo’ b y the moth of the trench normal to th / fth . eoaheo eoaoer vommez R3 Convert this volume to cubic yards Volume 2 yd3 0+50: ggt I 0 H50: = “SW 60 ﬁgs 75 Name _. —____ Fall 06 CE 271 Exam No. 2 Surveying Portion (50 pts) .. p/ease Show your work 5. (2 pts) In problem 4 above, would it be safe for workers to go down into this narrow trench to lay and join the sewer pipe? What would be done to make it safe? This was not speciﬁcally discussed. Use your judgment. No. Mtvcrpo'm m uMqW ‘l’rONLk Mr 5. (5 pts) A closed traverse has seven legs. What value should the interior angles sum to? 180°(n-Z) 130° (a) Ciao Sum = 7. (5 pts) Summarize the “Bowditch rule” in a sentence or two in your own words. “lam Correctly?) lightning and) 'Hua camellwts are an eqtml. ill-hf i' ...
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Fall_2006_271_survey_exam_2_solutions - CE 271 Exam No 2...

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