5. 1:3 million1 6-10 (4 points each- 20 points total) miles 6. The distance on a

Question

5. 1:3 million1 6-10 (4 points each- 20 points total) miles 6. The distance on an aerial photo between two houses measures measurement is 7,425 feet. What is the scale of the photo? 7. A pipe inlet is located 375 feet left of highway centerline station 7+10. The outlet is located 225 stations. What is the length of the pipe? right of centerline station 9+30. No curves are located between the 8. The elevation of the outlet of the pipe in question 7 is 791.30 feet. The inlet elevation of the pipe is 789.10 feet. What is the percent grade of the pipe? 9. The average amount of fill necessary to bring a site to grade is 3.75 feet over an area of 2.3 acres. How many cubic yards of fill is necessary to bring the site to grade? 1 acre 43,560 sq. ft.

Explanation / Answer

9) 3.75 grade over an area of 2.3 acre(=100188 ft) means giving 3.75 ft height rise over 100188 ft base and considering width 1 ft.

volume of triangular prism = 1/2 *(3.75*100188*) * 1 = 187852.5 cubic feet. Ans

8) % grade = change in elevation / length of pipe = (791.30-789.10)/ (375+225 ) = 2.2/600 = 0.36%

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